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Method of reactive power compensation in ac supply network Invention relates to electric engineering, first of all, to methods and devices for compensation or adjustment of a power ratio in converters or inverters, and in particular, relates to methods for compensation of reactive power in supply networks of industrial enterprises or individual loads of this power in order to meet the requirements of the power system to reactive power consumption. The proposed method consists in installation of a valve bridge 2 in each line of a supply network 1, and the bridge comprises in the inlet circuit at least one capacitor 3, and sending outlet current of the valve bridge 2 via the load providing for adjustment of current passing via this capacitor 3. The novelty is the fact that the load used is at least one light diode 6. Different modifications of this method are proposed, making it possible to optimise the compensation process. |
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Method of detecting battery removal In the method of detecting battery removal during a digital data communication session with the battery (160), data communication with the battery pack (150) and detection of battery (160) removal may occur substantially simultaneously. The battery (160) removal may be detected during data transmission from the terminal (100) to the battery pack (150). Furthermore, a response may he received by the terminal (100) from the battery circuits (155) in response to data transmitted to the battery (160) via the battery communication line (140), during sampling in a timed manner. |
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Controlling power outage and faulty state of electrical power system When executing an intelligent application associated with power outage, event messages are received, said messages indicating events associated with different devices in an electrical power system. The intelligent application associated with power outage determines the state of different devices based on said event messages. Based on the event messages, the intelligent application associated with power outage can determine and confirm the state of the power outage associated with a certain device. An intelligent application associated with a fault receives synchrophasor data for each phase in a multiphase electrical power system. The synchrophasor includes information on the value of the phasor vector and the angle of the phasor vector for each phase. |
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Invention is related to the field of primary sources of power. The substance of the invention consists in the fact that a pneumatic drive is made in the form of a belt with pads onto legs and is divided into the first and second semicircular parts, between which there are elastic elements installed, besides, the first part is made in the form of n bipolar magnetic films arranged along the belt perimeter, and the second one - in the form of parallel connected windings. |
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Device for balancing adjustment of cable voltages Device comprises the first, second, third terminals of phases of the cable and the fourth terminal of zero wire, three capacitors, three throttles, output terminals, the first, second and third voltage relays, each of which is equipped with one opening and two closing contacts, specified throttles of appropriate phases are connected between appropriate phases of cable and identical output terminals, three identical current switchboards are introduced, and three identical serial current switchboards. |
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Invention relates to the field of electric engineering and may be used in converters within a power supply system of electronic, electromechanical and lighting equipment. In the method of power ratio corrector control during the interval of positive half-wave of the supply voltage of the grid the first power key is maintained in the connected condition, and control pulses arrive to the second power key. During the interval of the negative half-wave of the supply voltage of the grid the second power key is maintained in the connected condition, and control pulses arrive to the first power key, at the same time the inlet voltage is measured by the control system based on the digital signal processor with the help of two half-wave rectifiers with identical division ratios. |
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Electric system to start aircraft engines Invention relates to an electric system to start an engine (18, 20, 22), comprising a rectifier (12) of AC into DC of AC voltage into DC voltage supplied from a power AC network (14), to produce the first DC voltage Vdc, a module (16) of DC conversion into AC to produce AC voltage of engine start with the help of the first DC voltage Vdc, comprising k parallel installed n-phase inverters (k>1), generating power that is at least twice lower than the maximum power Pmax, required to start the engine, and two lines of power supply of each inverter are connected to an electronic protective device receiving the first DC voltage Vdc, and n outputs of each inverter produce AC voltage of engine start via n serially connected inductance coils. |
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Invention relates to the method and device to control an electric system for supply of electric current to sockets for aircraft passengers. The method includes the following stages: setting the maximum electric current fed to sockets; cyclic detection of electric current consumed by sockets; if electric current consumed by sockets is higher than the maximum electric current, disconnection of one or more sockets from power supply, until the electric current consumed by sockets does not become lower than the maximum electric current; if electric current consumed by sockets is much lower than the maximum electric current, repeated connection of one or more sockets to power supply, until the electric current consumed by sockets does not become closer to the maximum electric current; and periodical variation of sockets connected/disconnected from power supply, so that each socket is connected to power supply within the first period of time (Ton) and is disconnected from power supply within the second period of time (Toff). |
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Shielded system of wireless multi-position charging of mobile devices Wireless multi-position charging system comprising a base unit in the form of one or several surfaces equipped with power transmitters, developing alternating magnetic field due to supply of AC current to a winding, coil or any type of current-conducting wires, grouped into a lattice, and also from a device of energy reception comprising a circuit of power supply control and a receiving coil, which induces current in the magnetic field of the transmitting coil, differing by the fact that it additionally includes: a shielding structure made as capable of weakening intensity of electromagnetic field outside the shielded wireless multi-position charging device; passive retransmitting antennas built into the charging device; a device of charging device adaptation to arbitrary arrangement of charged devices on the surface of the charging device. |
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Method to control autonomous system of geostationary spacecraft power supply Invention relates to electrical engineering, namely, to power supply systems (PSS) of geostationary spacecrafts (SC), using solar batteries (SB) as primary sources of energy, and energy accumulators are accumulating batteries (AB). The method is proposed to control an autonomous system of geostationary spacecraft power supply, comprising a solar battery and "n" accumulating batteries, a voltage stabiliser, connected between the solar battery and the load, and "n" charging and discharging devices, which consists in monitoring the extent of charge (discharge) of accumulating batteries, control of charging and discharging devices depending on inlet and outlet voltage of the power supply system and level of charge of accumulating batteries, prohibition for operation of the appropriate charging device, when the limit level of charge is achieved by this accumulator battery, removal of this prohibition with reduction of the level of charge to a certain value, prohibition for operation of the appropriate discharging device, when the minimum level of charge is achieved by this accumulator battery, removal of this prohibition, when a certain level of charge of this accumulating battery is achieved, at the same time the spacecraft includes an on-board computer to control condition and manage operation of the spacecraft and a command-metering radio line. |
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Uninterrupted power supply system Uninterrupted power supply system includes at least one storage battery, a consumer power supply system, a control unit, a unit of a starter mode, a unit of parallel operation with a network and other devices, a battery charging system including a unit of charging devices, a DC switching unit connected through an inverter unit and the unit of charging devices to the storage battery, and an AC switching unit connected through the unit of charging devices to the storage battery; the consumer power supply system includes a DC load switching unit connected through the converter unit to the storage battery, and an AC load switching unit connected through the inverter unit to the storage battery; the control unit is interconnected with the unit of charging devices, the inverter unit, each storage battery and each converter unit. |
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Recharging device for storage batteries of hybrid car Invention relates to electrical engineering and can be used in devices intended for recharging of a group of storage batteries installed on a transport vehicle. Essence of the invention consists in the fact that a device containing a power supply source, an accumulation tank, a current sensor and electronic switches, with that, when in a recharging mode, a storage battery is connected with one of the electronic switches as to a signal of the current sensor to a pre-charged capacitor from the power supply source, is equipped with two multiplexers of increased capacity and with a group of electronic switches based on field transistors, a group of accumulation tanks, the number of which is equal to the number of storage batteries included in the group; a group of current sensors, a multiplexer of information signals, an analogue-to-digital converter; with that, controlled inputs of two multiplexers, groups of electronic switches based on field transistors and a multiplexer of information signals are connected to the corresponding outputs of the microcontroller, and the group of current sensors through the multiplexer of information signals and the analogue-to-digital converter are connected to the microcontroller input. |
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Device for earth fault current compensation in three-phase electrical networks (versions) Invention is used in electrical engineering. The device represents an earthing bipole - a tracking width-modulated voltage converter (a tracking PWM converter) attaching the neutral of the network feeding transformer to earth and forming lagging current for compensation of leading capacitance current of single-phase fault to earth, as well as a neutral current sensor, a network voltage transformer, a clock signal generator for measurement of network capacity and a calculation unit for determination of the required admittance of the above bipole. In addition to a common set of functional units, the tracking PWM converter is equipped with a current setting unit, the inputs of which are represented by neutral voltage and the required admittance, and the output of which is represented by current demand supplied to the current control input of the tracking PWM converter, and transfer function of the current setting device provides for lagging phase shift of about 90 degrees on network frequency. |
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Invention relates to electrical engineering. A method of electrical energy transfer in a DC electric-traction network of urban electrified transport through an AC municipal network is proposed to improve the quality of voltage in both networks simultaneously. Operations of the method comprise integration of DC and AC networks by means of booster transformers connected at the input of municipal transformer substations, and transistor voltage inverters connected to a traction network, with addition of branch line switching operations on the high side at the main transformers of municipal transformer substations by means of mechanical switches. Transformation coefficients of the main transformers of municipal transformer substations are changed by branch line switching; with that, at the beginning of the electric-traction network where voltage is increased an increased transformation coefficient is set, and at the end of the electric-traction network where voltage is decreased a decreased transformation coefficient is set. Transformation coefficients of the rest municipal transformer substations are uniformly changed relative to the nominal value from increased to decreased one as far as they go from the beginning of the electric-traction network to its end. |
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Set of inventions relates to power supply unit, land vehicle, replacement station and replacement method for power supply unit installed on a vehicle. The power supply unit contains rechargeable electric energy accumulator, secondary coil. The power supply unit is made as pluggable unit with connecting element. The connecting element is intended for connection with mating connecting element installed in land vehicle. The connecting element represents primary coil of on-board network. The mating connecting element represents secondary coil of on-board network. The land vehicle contains the mentioned power supply unit. Replacement station contains replacing device. Method of power supply unit replacement includes vehicle positioning in working area of replacing device, connecting power supply unit using replacing device, opening mechanical connection between power supply unit and vehicle, withdrawal of power supply unit from the vehicle, power supply unit transportation out of working area, loading the second power supply unit on the replacing device, installation of the second power supply unit into vehicle, closing mechanical connection between the second power supply unit and the vehicle. |
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Recharger system for batteries of electric drones System includes recharger station (1) carrying a matrix of flat live electrodes (2) with electric connection to respective switching analysers (3), power source (4) with its positive and negative output connected to respective outputs of switching analysers, and navigation beacon. Drone (6) carries navigation device (7), battery (8) with electric connection of positive and negative outputs to on-board electrodes (9) and (10) respectively. |
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Method for mine vehicle use, mine device, drilling rig for mine rocks and mine vehicle Invention relates to mine vehicle use, mine device, drilling rig for mine rocks and mine vehicle. Tasks according to operational cycle are performed at working sites (19) using device (2) for carrying out mining operations in mine vehicle (1). At a working site, vehicle is connected to external electric main (20). Vehicle energy storage (26) is charged during operational cycle set by means of development plan when the vehicle is at working site. After operational cycle has been completed the electricity received from energy storage is used during movement. |
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System and method of isolation of current supplied to electric load in well System of connection to current-carrying lines consisting of current-carrying shell line, first current-carrying line, second current-carrying line and third current-carrying line includes: first control module capable to connect with the first current-carrying line and stay in serial connection with first electricity receiver in the well, connected to the second current-carrying line; second control module capable to connect with the second current-carrying line and stay in serial connection with second electricity receiver in the well, connected to the first current-carrying line; third control module capable to connect with the first current-carrying line and stay in serial connection with third electricity receiver in the well, connected to the third current-carrying line; and fourth control module capable to connect with the first current-carrying line and stay in serial connection with fourth electricity receiver in the well, connected to current-carrying line of the shell. When the first control module feeds current to the first electricity receiver in the well, second, third and fourth control modules feed uncontrolled current to the second, third and fourth electricity receivers in the well, respectively. |
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Standalone power supply system Invention is related to electric engineering and to power supply systems of standalone facilities using solar batteries as the primary energy sources and accumulator batteries as energy accumulators. The substance of technical solution involves use of solar battery with additional intermediate bus connected to circuit of second power input output of voltage stabiliser in order to reduce voltage pulse amplitude at reactor windings of voltage stabiliser with its switch element switched to voltage of intermediate solar battery bus, while two-winding reactor and second capacitor added to the voltage stabiliser form a magnetic link filter that adds functions of accumulation battery charge and discharge to the voltage stabiliser when equipped with additional diode and four switch elements. |
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Invention relates to communication equipment which employs electronic devices with batteries, and is intended to slow down battery ageing caused by charging current and repeated charge-discharge cycles with virtually maximum charge capacity. The invention discloses an electronic device which includes a battery, a charging section which charges the battery with energy obtained from an external power source determined by charging current, a measuring section which measures the value of charge accumulated in the battery, a temporary information collection section which collects temporary information, a storage section which stores charging history showing the period of time during which the user performs charging, and a control section which includes a section for estimating chargeable time based on charging history and temporary information, and a section for setting charging current which calculates a limited charging current which enables to charge the battery to a given charge capacity over the chargeable time based on data on the amount of charge obtained from the measuring section and which sets the limited charging current in the charging section. |
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Information rewriting device and recording medium Invention relates to computer engineering. The information rewriting device comprises a first storage unit provided in a battery, storing first information with possibility of rewriting; a second storage unit provided in a battery charger which charges the battery by being electrically connected to the battery detachably therefrom, the second storage unit storing second information with possibility of rewriting; at least one rewrite unit provided in at least one of the battery and the battery charger, the at least one rewrite unit rewriting either the first information stored in the first storage unit or the second information stored in the second storage unit based on the other information out of the first information and the second information when the battery and the battery charger are electrically connected; and a protocol changing unit which changes a data transmission protocol between the battery and the battery charger from a first protocol to a second protocol when the at least one rewrite unit rewrites the either information. |
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Damaged section determination method for sectionalised line of ring network Since tripping of a short-circuit current surge in a line of the main power supply unit the countdown is started, which is equal to the operation delay time of an automatic transfer switch (ATS). Availability of the operating current is monitored in this line, and when it is equal to zero, and at the moment of the countdown completion the operating current surge occurs in the line of the main power supply unit with the value defined by a load of this line section adjacent to the ATS point, then conclusion is made about a damage of the master section in this line, and if the operating current is not equal to zero and defined by the load connected to the master section in the line of the main power supply unit and at the moment of the countdown completion the short-circuit current surge occurs in the line of the main power supply unit, then conclusion is made about a damaged section in the line of the main power supply unit adjacent to the ATS point. |
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Application: in the field of electric engineering. The technical result is expansion of functional possibilities. According to a method when short-circuiting surge occurs in the line of the main power supply source, the countdown is started, which is equal to the operation delay time for the MCB protection in this line, and if at the moment of this countdown completion the short-circuit current disappears then the conclusion is made about the MCB cut-off in the line of the main power supply source, since disappearance of the short-circuit current the countdown is started, which is equal to the operation delay time for switching of an automatic throw-over circuit-breaker, and when this time is over, in the line of the main power supply source operating current surge is controlled and if its value is lower that the value of the cut-off operating surge and equal to the value defined by the load connected to a section of the line of the main power supply source placed in adjacency to the automatic throw-over circuit-breaker, then the conclusion is made about spurious tripping of the sectionalising circuit-breaker. |
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Invention relates to electric engineering. The invention claims a three-phase balancing device where a three-phase three-leg transformer contains windings connected in an opposite staggered way. Free leads of the first windings are connected to output terminals and free leads of the second windings are connected into a common zero point to couple phase loads. In each phase there is one or two in-series voltage adding windings coupled through a two- or three-position switch in sequence with load at the side of the supply mains. |
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Device for remote control of wire, lightning protection cable or cable of overhead transmission line In a case (2) installed on a controlled element (1) of an overhead transmission line there is a self-contained power supply source (3) and a control unit (4), to which a measurement unit (5) and a cordless transceiver (6) are connected. The unit (4) can bind measurement results to standard time stamps, transmit data and receive control data through a transceiver (6), and the unit (5) is equipped with a current sensor (7) based on the Hall effect and a temperature sensor (8) of the controlled element (1) and at least one instrument of the following group: an inclinometer (9), a three-position accelerometer (10) with function of a G-sensor, a wind metre (11) oriented across the power transmission line. The unit (4) is equipped with a self-contained chronometer (12) and/or a receiver (13) of standard time signals from the satellite navigation system, an ultrasound or a laser range finder (14) oriented towards the Earth and an air temperature sensor (17). The device is equipped with a self-contained video recorder (15), a solar battery (16) for charging of the source (3). |
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Method for determination of synchronous oscillations source Scope of application - in systems for estimation of correct functioning for automatic excitation controllers (AEC) and excitation systems (ES) of the power plant generators. A criterion for determination of synchronous oscillations source is a phase shift value of reactive power Qg and the current value of the generator voltage Ug. When fluctuations of the generator reactive power and voltage are in-phase or the fluctuations of the generator reactive power are in advance of the fluctuations of the generator voltage per a value within the range of the preset value, then the identified generator is the source of synchronous oscillations. The generator being the source of oscillations between generators at the same power plant is identified against the minimum difference in fluctuation phases of reactive power or voltage. |
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System and method for reducing electric power consumption Invention relates to controlling electric power consumption, particularly to a system and a method of reducing consumption in consumption by request systems. The system for reducing electric power consumption includes a central server and a plurality of devices which reduce electric power consumption. The central server of the system has a network interface configured to transmit and receive information to/from a communication network; a unit which determines the state of the electric mains, connected to the network interface and configured to transmit a message on the state of electric power consumption through the network interface and a network of at least two devices which reduce electric power consumption, connected to the network; a unit which calculates a bonus for saving electric power, configured to determine the total bonus earned for overall reduction of electric power consumption initiated by at least two devices which reduce electric power consumption in response to reception of a message on the state of electric power consumption, and also configured to determine, in the total bonus, individual parts associated with each of the devices which reduce electric power consumption. |
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Device and method for power compensation in vehicle by means of capacitor with high capacitance Invention is related to power supply units of vehicles. The device and method are suggested for compensation of electric load power in a vehicle by means of a capacitor with high capacitance. The capacitor with high capacitance discharges current rapidly in order to compensate power when voltage at the generator and accumulator output drops temporarily during motion of the vehicle, and the capacitor is charged by permanent power pulse in order to prevent instability of the accumulator voltage in result of the generator overload taking place when the capacitor is charged. Charge of the capacitor is stopped temporarily and it discharges current to compensate power of the electrical load if voltage drops at the accumulator battery terminals in result of electrical load at the charged capacitor thus leading to compensation of power supply instability, e.g. voltage drop, in real time mode. |
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Method to control autonomous system of spacecraft power supply Invention is related to electric engineering and namely to power supply systems (PSS) of spacecraft using solar batteries as the primary energy sources and accumulator batteries as energy accumulators. The invention suggests a method for control of autonomous system of spacecraft power supply that contains a solar battery and n of accumulator battery, a voltage stabiliser coupled between the solar battery and load and n of charge and discharge devices; the method lies in control of the voltage stabiliser and charge and discharge devices depending on input and output voltage of the system, control of charge and discharge degree of the accumulator batteries, prohibition of operation for the respective charge device when it reaches the charge limit of the accumulator battery, enablement of operation when a certain discharge degree is reached by this accumulator battery, prohibition of operation for the respective discharge device when it reaches the discharge limit of the accumulator battery, enablement of operation when a certain charge degree is reached by this accumulator battery, at that in case when solar batteries loose their orientation to the Sun or in case of emergency discharge of accumulator batteries operation of all discharge devices is banned (locked), and after recovery of the solar batteries orientation to the Sun and charge of the accumulator batteries up to the preset level operation of all discharge devices is unlocked. |
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Filtering and compensating device for transmission of high-voltage direct-current energy Invention relates to electrical engineering. In the device adjustment of reactive power is carried out by switching of two or more branches, each of them is equipped with a switch for connection to the supply mains and includes capacitor banks, resistors and chokes performing functions of filtration and compensation. The device contains also one or more active elements. The capacitor banks of the device are connected to the ground through a common active element by the respective quantity of medium-voltage switches or through separate active elements and they perform the function of compensation only. The filtration functions are performed by one active element only; to this end in addition to a common set of functional units the active element balancing system is equipped with three programmable specific functional units: damping unit D, balancing unit B, unit S of selective harmonic suppression which generate driving voltages, and sum of the latter ones forms the main variable for control of the converter. |
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High-voltage three-phase alternating current generating system Invention in the field of electrical engineering. The system contains a synchronous generator with excitation from permanent magnets and three galvanically isolated three-phase windings at the stator, a static converter of electric energy based on direct frequency converter with three-phase output and natural commutation (a cycloconverter), which each phase is assembled as per the scheme of three-phase bridging reverse rectifier (BRR) with a capacitor of a low-frequency filter coupled in parallel to its output terminals and powered by one of the three-phase systems of the synchronous generator windings, one of the BRR outputs is coupled to the respective phase of a three-phase load. There is an additional phase of the direct frequency converter with three-phase output and natural commutation, which is assembled as per the scheme of three-phase bridging reverse rectifier with a capacitor of a low-frequency filter and powered from a three-phase transformer, which primary windings are coupled to any three-phase system of the synchronous generator windings, the second outputs of the three BRRs are coupled to one output of the additional phase of the direct frequency converter while the second output of the additional phase of the direct frequency converter is coupled to the zero wire of loads in the generating system. |
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Device for electric energy transmission in rocket and space complexes (versions) Invention is related to device for electric energy transmission. The result is obtained by conversion of electric energy from the energy source to high voltage of high frequency and transmission of electric energy through a single wire in resonance mode to consumers where a down converter with several output voltages is installed. The technical result is also reached by the fact that the device contains a ground power source, a power transmission line and the onboard cable network, the ground power source includes a frequency converter, a stepping-up resonance circuit, a single-wire power transmission line and a reducing transformer, the resonance circuit midpoint is connected to the feedback unit for automatic adjustment of output voltage and frequency in the power transmission line, while the reducing transformer has several output windings for connection to loads of different voltage, at that one of the windings is also connected to the feedback unit of the frequency converter for fine adjustment of output voltage in the loads. |
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Invention is related to the field of engineering and may be used in uninterrupted power supply (UPS) systems and inverters. The method and device solving the problem of mismatch between UPS systems of non-sinusoidal oscillations and loads with active power factor compensation (PDC) includes the following stages when non-sinusoidal oscillations to be delivered as a load (e.g., voltage fluctuations) are generated with relative pulse duration of pulse-width modulation (PWM); discretisation of these non-sinusoidal oscillations to accumulate output signal readings and regulation of relative pulse duration to control non-sinusoidal oscillations depending on output signal readings in order to deliver the desired signal characteristic (e.g., mean-square signal level) as a load. In the embodiments the relative output pulse duration is regulated in different ways in case of growing and lowering power consumption by the load respectively. |
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Method of computer-aided power system operation and computer-aided power system Invention relates to electric power supply system (10). Said system comprises data processing device (11) to output the programme. Said programme outputs functions for control over power supply system and is connected with multiple automation devices (13) and, at least, one remote memory unit (15a, 15b, 15c). This memory unit stores at least one programme component required for execution of at least one programme. Note here that at least one local memory device (16) stores the copy of at least one programme component. After programme initiation local device (11) checks if said copy complies with programme component stored at memory unit (15a, 15b, 15c). If YES, local device (11) executes the programme using at least one copy of programme component. If NO, said local device (11) calls at least one programme component for at least one remote memory device (15a, 15b, 15c) to execute the programme with its help. |
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Electric installation with electric battery capacity Invention refers to vehicle battery chargers. The presented electric installation with an electric battery capacity represents a power transmission facility comprising a voltage supply converter, an AC voltage network connected to an AC voltage terminal of the converter, and a DC voltage node connected to a DC voltage terminal of the converter. The converter comprises in-series connected switching elements each of which has at least one energy storage capacitor. The electric batteries can be parallel connected to the above capacitor, and a charging status can be adjusted by controlling the switching element of the voltage converter through a control circuit. |
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Automotive transport power system with principle of periodic charging, discharging Invention relates to automotive transport power system with principle of periodic charging and discharging. Automotive transport power system contains automobile electric road, stations for electromobile charging and discharging, vehicle. Charging and discharging stations consist of control and monitoring unit, electric transformer, underground electric power cable, positive charge feed bus, negative charge feed bus, emergency generator. Charging stations are placed at uphills. Discharging stations are placed at downhills. Vehicle is active element. Vehicle contains automotive wheel base, electric motors, batteries, power-generating mechanism, recovery system, system for temporary storage and proper distribution of power. Electric current supply rod with rising-lowering mechanism is located on the bottom of vehicle. Charging and discharging is performed in motion. |
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Charging system for electrical vehicles System contains at least one charging port with interface for energy exchange with at least one electrical vehicle, at least one power converter intended to convert power supplied from the power source such as the supply mains to the format suitable for the vehicle charging, at that the power converted is in remote position from the charging port, for example, in a separate room and/or building. |
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Method for matching symmetrical four-wire power transmission line to electrical load Invention is related to electric engineering and may be used for transmission of electric power to consumers through a non-uniform four-wire power transmission line. Matching of the non-uniform four-wire power transmission line to electrical load is attained in result of fulfilment of certain conditions including comparison of actual (measured at the site in real time mode) and reference (determined by means of special software) resistances of the generalised loads and voltages at the end of non-symmetrical section included in the non-uniform four-wire power transmission line or currents coming to the generalised loads. Input data on voltages, currents and frequency at the non-symmetrical uniform sections included into the line composition can be obtained through the interface unit, or sensors made in the form of voltage and current transformers or in the form of voltage dividers and alternating current shunts, spectrum analysers and frequency meters. In result of the input data processing control signals are generated for adjustment bodies, which may be represented by constant-voltage regulators of power transformers, chokes, three-phase devices and single-phase devices that generate current and voltage such as capacitor banks, three-wire (without the fourth wire from the neutral line of the power source or load) generalised loads consisting of step-down transformers, which primary and secondary windings are wye/wye-connected with neutral power lead or delta/wye-connected with neutral power lead. |
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Device exchanges electric energy between power systems (1) and (2). Voltage inverters at each side are formed by diode bridges (7) and (8) and bridges (11, 12) of back-to-back closing gates. The controlled bridges (11) or (12) can be switched off for the periods of unidirectional energy transmission to perform routine maintenance or to reduce losses of electric energy. |
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Voltage stabilisation system at extended power transmission line Voltage stabilisation system contains a transformer substation and an aerial transmission line with power supply branch lines, three independent voltage adders at each of the phase lines installed at the end of the last line, at that the voltage adder is made as a bridge circuit, two parallel interconnected branch lines, which consist of in-series accumulating LC delay line and bidirectional transistor-based commutator, in the bridge circuit diagonal there is an installed bidirectional triode thyristor, accumulating LC delay lines of the bridge circuit branches are connected to phase and zero wires respectively. |
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Application: in the field of electric engineering. A device contains at least one input/output module (24). The module (24) consists of a body (34) with a mounted circuit board with at least one signal processing unit, at least one bus connector (36, 38) which passes through the first side of the body and a set of terminal blocks (40) to connect field wires to the field equipment, at that the terminal blocks are placed at the second side of the body. At least one signal processing unit includes at least one unit for conversion of input and output signals to/from the field equipment and interfacing through the bus as per the bus communications protocol. |
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Power distribution system and method Invention is related to a power distribution system and method. The system (10) contains a lot of generating systems (12, 14, 16, 18), at that each generating system (12, 14, 16, 18) contains an alternating current generator (20, 22, 24, 26) coupled directly to the rectifier (28, 30, 32, 34). The alternating current generator (20, 22, 24, 26) with slewing capacity is coupled to the energy source (13, 15, 17, 19). During operation of the energy source (13, 15, 17, 19) the alternating current generator (20, 22, 24, 26) generates an output signal (38, 40, 42, 44) desynchronised in regard to the variety of other generating systems (12, 14, 16, 18) and having a variable velocity. The rectifier (28, 30, 32, 34) coupled directly to the generator (20, 22, 24, 26) is adapted to convert an output signal (38, 40, 42, 44) of the alternating current generator (20, 22, 24, 26) into direct current output signal (46, 48, 50, 52). The direct current distribution bus (36) is connected to direct-current outputs (46, 48, 50, 52) of each rectifier (28, 30, 32, 34). The system (10) contains also a variety of inverters (56, 58, 60, 62) adapted to receive power from the bus (36). The output signal of each inverter (56, 58, 60, 62) is adapted to activate an alternating current motor (64, 66, 68, 70). |
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Multilevel converter as reactive power compensator with active power balancing Application: in the field of electric engineering. A multilevel converter (7) has several converting lines (8-10) which are wye- or delta-connected to phases (2-4) of the three-phase network. On the basis of phase voltage (U2-U4) values and phase current (IL2-IL4) values an active component (w) and at least two asymmetric components (w', b') are determined. The active component (w) and at least two asymmetric components (w', b') are filtered by means of the respective filter response. The phase voltage (U2-U4) values are multiplied by the component (w) and by at least two components (w', b'), whereupon they are multiplied by the respective weight coefficient (ga-gc) and the result is applied to the phase current (IL2-IL4) values. Current (I0) is determined in the neutral wire on the basis of components (w', b') and values (U2-U4) and applied to the phase current (IL2-IL4) values. Based on the phase current (IL2-IL4) values modified in this way the control state (A) is defined for the converting lines (8-10). The converting lines (8-10) are thus controlled respectively. |
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Reactive power control systems, devices and methods Invention is related to the field of electric engineering and may be used for reactive power control in power supply systems for such devices as digging machines of different type, which are used for mining operations. The approximate defined embodiments can provide an adapted system, a device, manufacture, a scheme and/or a user interface and/or a method and/or a machine-readable medium containing instructions for activities that can contain by means of the preset data device for the preset digging machine consisting of a variety of active input cascades, at that each active input cascade is coupled electrically to the AC power mains of the above digging machine, each active input cascade is adapted to supply DC power to the DC bus, the above DC bus is coupled electrically to a variety of inverters and each inverter is adapted to supply AC power to at least one operating motor, an active power control is formed by each active input cascade in an independent way. |
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Method is implemented with introduction of an active mains filter 22 and two groups of the secondary windings at transformer-rectifying cascade 7 into the construction of the third relay 21. |
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Uninterrupted and secured power supply system for crucial power consumers System consists of an accumulator battery, a direct-current motor coupled to the generator shaft, a three-phase rectifier, the system has an asynchronous generator with rotor and special stator windings with load connection terminals taken from the middle of the above windings, the main and auxiliary exciting capacitors, a voltage regulator, a frequency control and regulating unit, a regulating element, an active power directional relay, a high-speed breaker, and the supply mains. |
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Control device for providing parallel operation of vst generator Invention is related to the control device for providing parallel operation of a VST generator. The control device for providing parallel operation of a VST generator A contains the first, second and third invertors (22a, 22b, 22c), each one is connected to three windings laid around an alternating-current generator with a motor drive, the invertors convert alternating current outputted by the windings to direct- and alternating current in order to supply converted alternating current. The device also contains the first, second and third controllers (CPU 22a2, 22b2, 22c2) to control ON/OFF switching of the switching elements in order to ensure parallel operation of the VST generator A with at least one VST generator B having the same construction as the VST generator A in order to generate three-phase alternating current. |
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Application in the field of electrical engineering. The system includes a battery power source of electric power-driven tool and an auxiliary power supply source. The battery power source has a battery and a monitoring circuit. The battery has at least one battery cell. The monitoring circuit is actuated by electric power supplied from the battery; the circuit controls state of the battery. The auxiliary power supply source outputs electric power that allows operation of the monitoring circuit. The monitoring circuit is made so that when the circuit is inoperable with electric power supplied by the battery in result of battery voltage decrease the circuit may operate with electric power supplied by the auxiliary power supply source. |
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Power supply interface for electric tool powered by plurality of battery packs, and adapter Electric tool containing tool case, electric load placed inside the above tool case; power supply interface for the above electric tool containing interface of the first battery pack adapted for removable fastening of the first battery pack and including an input terminal of the first battery positive terminal and an input terminal of the first battery negative terminal; interface of the second battery pack adapted for removable fastening of the second battery pack and including an input terminal of the second battery positive terminal and an input terminal of the second battery negative terminal. The input terminal of the first battery negative terminal is connected electrically to the input terminal of the second battery positive terminal, at that the input terminal of the first battery positive terminal is connected electrically the input terminal of the second battery negative terminal through the above electrical load. The indicators (160; 260) adapted for data display in regard to the respective states of the first battery packs are placed so that they are seen simultaneously by the electric tool user. |
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Hierarchical control system for battery of electric energy accumulators Hierarchical control system for a battery of electric energy accumulators relates to the field of electric engineering and it can be used for manufacturing of high-voltage batteries of electric energy accumulators for transportation and power-generating sectors. The essence of the invention lies in that each of the series-connected electric energy accumulators has at its lower control level an individual control unit powered from the accumulator and connected at the medium control level through an intramodular serial communication channel isolated galvanically to the respective control unit of the electric energy accumulators powered and connected at the upper control level through an intramodular serial communication channel isolated galvanically with the battery control unit powered by the battery. The accumulator control unit consist of a monitoring and control unit based on a microcontroller and a balancing unit based on transformer circuit, which is made as a device for bidirectional energy transfer from an individual battery accumulator through a current sensor to the direct-current accumulating line end-to-end for the battery, this line contains parallel capacitors of the accumulator control units, which are coupled in parallel to secondary windings of the accumulative transformer made as a transformer with flyback voltage converter stepping the voltage up to the side of the battery accumulating line, with diodes shunted by electronic keys in the primary and secondary windings of the transformer and controlled from the respective drivers by means of the microcontroller for the accumulator control unit. The accumulator control unit is connected to the temperature control unit while the battery control unit based on the high-efficient microcontroller with enhanced memory capacity is connected to the battery current sensor, a switching unit with a fuse and onboard charge device and through in-series communication channel isolated galvanically to the onboard charge device and to external systems. |
Another patent 2513941.