RussianPatents.com
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Power distribution system and method. RU patent 2519824. |
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FIELD: electricity. SUBSTANCE: 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). EFFECT: improvement of power distribution quality. 15 cl, 4 dwg
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System of synchronous generator excitation with external boosting / 2510698 Excitation system includes synchronous generator (1) with armature (2) and inducer (3) windings, rectifiers (4), (15), summing transformer (5) with primary current winding (6), primary voltage winding (7), secondary winding (8) and control winding (9) and voltage corrector (10), external DC source (11), electronic key (12), current transformer (13) with shunt (14). System contains analogue-to-digital transformer (16), memory registers (17,18), pulse distributor (19), generator of pulses (20) with stable frequency, substractor (21), decoder (22), clamps (23, 24) for load connection, RS-trigger (25), differentiator (26), logic elements OR (27), AND (31), START bus (28), generator-limiter (29), inverter (30). |
Device for start-up and brushless excitation of non-contact synchronous machine / 2502180 Device includes the main synchronous machine (1), inversed synchronous exciter (2) of the main synchronous machine in a common magnetic system with an asynchronous subexciter made in the form of an asynchronous motor, excitation winding of the synchronous exciter, winding located on the rotor, a rotating semiconductor converter and an excitation control. It is equipped with switching device of modes (7), metre (8) of rotor rotation frequency of the main synchronous machine with an inlet and an outlet and winding switches (9, 10). Winding is made in the form of coil groups in a non-salient pole magnetic system of the stator and the rotor, and the magnetic system is combined as to magnetic flows with smaller number of poles for motor operation and large number of poles for generator operation. |
Device of electromechanical control / 2500064 Device of electromechanical control includes the second induction motor and the second block of three automatic splitters. The first, second and third outputs of the block from three switchboards are accordingly connected with the first, second and third inputs of the second induction electric motor, rigidly connected to the first induction electric motor, and the first, second and third outputs of the induction generator are accordingly connected to the first, second and third inputs of the second block from three automatic splitters, having the first, second and third outputs of which accordingly connected with the first, second and third inputs of the first block from three automatic splitters, the fourth, fifth and sixth outputs of which are accordingly connected to the first input of the first AC voltage stabiliser, with the second inputs of the first and second AC voltage stabiliser and with the first input of the second AC voltage stabiliser and having a separate input connected to the output of the motor control panel. |
Electromechanical control device / 2491708 Voltage multiplier, toroidal potentiometer, drive, a unit of two automatic circuit-breakers and commutation switch are introduced into elecrtromechanical control device; at that output of three-phase rectifier is connected to the first input of the automatic circuit-breaker having an output connected to the first input of the unit of two automatic circuit-breakers having the second output and the first and second inputs connected respectively through toroidal potentiometer, through voltage multiplier to the above output of the automatic circuit-breaker, through commutation switch to input of the electric motor, to input of the drive connected rigidly to toroidal potentiometer. |
Electromechanical control device / 2491707 Voltage multiplier, potentiometer and commutation switch are introduced into the electromechanical control device; at that output of the three-phase rectifier is connected through voltage multiplier, potentiometer and commutation switch to the input of automatic circuit-breaker. |
Device for magnetic field killing when synchronous machine excitation winding is disconnected from power supply / 2488940 Device for magnetic field killing when the synchronous machine excitation winding is disconnected from the power supply contains a switching apparatus (1), placed in parallel to the power supply (2) and the excitation winding (3); connected parallel to the said winding is a circuit consisting of an active resistance (4) and a circuit, placed in parallel; the latter circuit contains two thyristors (5, 6) or a thyristor and a diode, parallel and back-to-back. The device also contains a circuit with low resistance represented by or placed parallel to the circuit excitation winding containing a control key (7) or connected parallel to the active resistance (4) of the circuit containing a diode or thyristor (8) and a capacitor (9), serially placed; connected parallel to the capacitor is a discharge resistor (10). |
Stabilised electric machine power supply source / 2484576 Device contains a synchronous generator with stator and excitation windings, a rectifier connected to the stator winding, a voltage sensor connected to the rectifier output pins, a voltage setting device, a control circuit and a device for rigid negative feedback; included in the control circuit are additional connected element: a comparison unit, a regulating device, a key element, a reverse diode; additionally introduced are a sensor of excitation current in the excitation winding circuit, a device for isodromic (flexible) negative feedback; functionally. The device is intended for transmission of excitation current oscillations as may occur from the excitation current sensor output to the third input of the comparison unit without phase shift. |
System of voltage generation / 2474941 In the working mode the output voltage value of a generator (1) is controlled due to variation of a control winding (2) current, which is realised with the help of a transformer (6) and a key (8), switched in compliance with a law of width-pulse modulation. When the key (8) is closed, energy of a power supply source (9) via a transformer (6) is sent to an excitation winding (2) of a generator (1). When opening the key (8) the transformer (6) stops supplying to the excitation winding (2) and is demagnetised via a circuit formed by a demagnetisation winding (10), a diode (11) and a source of supply (9), (continuity of current in the winding (2) is maintained due to the diode (3). In case of a short circuit of the key (8) the voltage on the secondary winding (5) of the transformer disappears, current through it reduces down to zero, and accordingly, current leakage also stops via the control winding (2) of the generator (1). The generator stays without excitation, which causes reduction of its output voltage down to zero. The system is insured against uncontrolled increase of generator output voltage level in case of a short circuit in a control key, and power consumers are protected against overvoltage. |
Device to control output voltage of power generator / 2472285 In a device to control output voltage of a power generator (1), comprising a generator winding (2) and an excitation winding (3), wound onto a stator, a magnetising winding (5), wound onto a rotor, and a rectifier (12), which rectifies current generated by the excitation winding (3), and sends rectified current to the magnetising winding (5), output voltage is compared, generated by the generator winding (2), with a reference oscillation, distortion ratio of which is 0%, based on results of this comparison, the generation unit (24) adjusts the moment of generation of output width and pulse modulation signals, and also there is a circuit to generate a magnetising current (20), which sends magnetising current to a magnetising winding (5). |
System of excitation of synchronous generator / 2470454 Invention relates to the field of electrical engineering and may be used in electric machines for control of excitation of synchronous generators applied in autonomous sources of electric energy. The technical result is expansion of functional possibilities. The excitation system comprises a synchronous generator (1), a winding of an anchor (2) and an inductor (3), the first rectifier (4), the summing transformer (5) with the primary current (6) winding and the primary voltage winding (7), the secondary (8) winding and the control winding (9), a voltage corrector (10), an outer source of DC current (11), an electronic key (12), a current transformer (13) with a shunt (14) and the second rectifier (15), an analog to digital converter (16), the first (17) and the second (18) registers of memory, a pulse distributor (19), a pulse generator (20) of stable frequency, a subtractor (21), a setting register (22), a numerical comparator (23), the first differentiator (24), an RS-trigger (25), the second differentiator (26), a logical OR element (27), a START bus (28), a shaper-limiter (29), an inverter (30) and a logical AND element (31). |
Method and system of wireless control of switching devices in power supply network / 2510124 In the method and system of wireless control of switching devices each power converter comprises semiconductor devices of higher capacity. Control signals are sent between a controller and a wireless unit of one or more of the specified multitude of power converters with application of the wireless communication system. Control signals are sent to a local wireless unit of one or more multiple power converters. Data transmission includes data packages containing such control information that the time module of the local wireless unit may be synchronised with usage of the time synchronising information of the wireless communication system. Other aspects of this invention include a system applying the specified method and software for realisation of this method. |
Method to control parallel operation of two gas turbine power plants / 2479909 Application: in automated control systems (ACS) of gas turbine auxiliary power plants (GTAPP) of compressor stations of manifold pipelines and small enterprises. In the first GTAPP the specified active power is corrected by an integral from mismatch between actual capacities of GTAPP, in the second GTAPP only in the autonomous grid the specified active power is corrected only by an integral from deviation of a grid frequency from the rated one, thus corrected specified capacities are multiplied by a ratio of frequency droop and are added, accordingly, the first one - to a setpoint of a frequency controller of the first GTAPP, and the second one - to a setpoint of a frequency controller of the second GTAPP. |
Method to control one or several power generator plants / 2479908 Load capacity is measured, capacity of power generators is measured, the difference of specified capacities is defined, the produced value is used to generate a signal of capacity control as a control action to change the capacity of power generator plants, control is carried out in the mode of operation in parallel with the external grid, or in the mode of operation as isolated from the grid, in the mode of operation in parallel with the grid when generating a signal of capacity control, a signal of request for disconnection of one or more loads is used, using which values of capacities of disconnected loads are subtracted from the previously determined difference, in case of equality of the grid capacity and the total capacity of disconnected loads, a control signal is generated for disconnection of requested loads, and if the capacity value from the grid is reduced below the specified value, connection of ballast resistances is carried out with subsequent smooth reduction of ballast capacity. When operating as isolated from the grid, a signal of request for loads connection is used, added capacity is determined as the value of capacities of connected loads, and a signal is generated for smooth connection of ballast resistances with the speed of not more than the specified value, in case of equality of capacities on ballast resistances and added power, ballast resistances are disconnected, and requested loads are connected. |
Switching method of gas turbine electric power plant with free turbine to independent load / 2479089 According to the proposed method, command for switching of a high-voltage generator switch is supplied first to the rotation speed control system of the turbocompressor, thus changing it over to acceleration mode; at the same time, control of rotation speed of free turbine is deactivated, and when frequency of free turbine increases up to 105% of the nominal, the acceleration mode of turbocompressor is deactivated; the command is supplied to the high-voltage switch drive; then, control of rotation speed of free turbine is recovered through the specified time delay that is sufficient for actuation of its drive. |
Method to control gas turbine engine with free turbine for power plants of low and medium capacity / 2476971 Used in automatic control systems (ACS) of gas turbine engines (GTE) with a free turbine, applied within gas turbine units (GTU) to drive power generators (PG) of gas turbine power plants (GTPP). When controlling a gas turbine engine with a free turbine for power plants of low and medium capacity, fuel flow into a combustion chamber is changed depending on mismatch between specified and measured values of free turbine shaft rotation frequency. Additionally, in case of disconnection of a power plant from a grid of unlimited capacity, the specified value of free turbine rotation frequency produced when picking up load in the grid of unlimited capacity is reset down to the rated value. |
Method to control static stabilised sources of ac voltage operating in parallel for common load in case of its asymmetry / 2472269 In a control method, based on conversion of instantaneous values of voltage at a common load and output currents of sources from a three-phase abc-system of coordinates into a double-phase dq-system of coordinates, the first and second differential signals are generated by subtraction of accordingly d- and q-components of currents from only two sources, the first and second signals of comparison are generated for d- and q-components of a control signal, stabilising parameters of voltage of direct sequence on the common load and current-distributing loads of direct sequence between sources, in differential signals the final number of harmonic components is identified with maximum amplification ratio, generation of d- and q-components of a control signal is carried out by subtraction of the sum of identified harmonic components accordingly from the first and second differential signals from the first and second signals of comparison, amplitude and phase of modulating signals are generated by reverse conversion of d- and q-components of the control signal from a double-phase dq-system of coordinates into a three-phase abc-system of coordinates. |
Method to control static stabilised sources of ac voltage operating in parallel for common load / 2472268 Instantaneous value of common voltage is measured, as well as instantaneous values of output currents of sources, they are converted from a three-phase abc-system of coordinates into a rotary double-phase dq-system of coordinates, reference signals are generated for d- and q-components of common voltage, signals proportional to d- and q-components of common voltage, signals proportional to d- and q-components of currents of sources, the first and second differential signals, the first and second signals of comparison by means of integration of appropriate first and second differential signals, d- and q-components of a control signal are generated, modulating signals are generated by reverse conversion into a three-phase abc-system of coordinates, one of parallel operating sources is selected as master, and other ones - as slave, besides, the first and second differential signals of a master source are generated by subtraction of signals, proportional to d- and q-components of common voltage, from reference signals, for master sources the first and second differential signals are generated by subtraction of a signal proportional to d- and q-components of its current from a signal proportional to d- and q-components of the master source current, and the specified d- and q-components of control signals are generated by summation of signals of comparison and signals proportional to d- and q-components of currents of sources. |
Aircraft power controller / 2464204 Invention relates to power engineering and may be used in power controller 1 design to control aircraft hydride power source. Power controller 1 allows measuring power demand of consuming hardware 2. Said device 1 allows determining first operating characteristic of first power source 3 and second operating characteristic of second power source 4. First power source 1 and second power source 4 serves to generate first and second required portions of necessary demand. |
Method to control static stabilised sources of ac voltage operating in parallel for common load in case of its asymmetry / 2460194 In a control method instantaneous voltage values on a common load and output currents of sources are converted from a three-phase abc - system of coordinates into a double-phase dq-system of coordinates, control signals are generated to stabilise parameters of voltage of direct sequence on the common load and to distribute load current of direct sequence between sources. Control signals are converted from the double-phase dq - system of coordinates into the three-phase abc - system of coordinates, zero sequences of source currents are defined. For each source difference signals of zero sequence currents of only two sources are generated, a final number of harmonic components is extracted from them with a higher amplification ratio, modulating signals are generated in accordance with the invention formula. |
Method to control static stabilised dc voltage sources operating in parallel into common load / 2381609 Invention relates to electrical engineering and can be used in organising electric power generation systems or uninterrupted power supply systems with sources connected in parallel into common load. Proposed method comprises measuring instantaneous voltages at common load and source instantaneous currents, obtained magnitudes being transformed from three-phase abc-system of coordinates into two-phase dq-system of coordinates, and generating reference voltage signals for d- and q-components of total voltage. Extra voltage signals are generated in proportion to d- and q-components of total voltage. Difference voltage signals are generating by subtracting appropriate extra voltage signals from reference voltage signals. Voltage comparison signals are generated by integrating voltage signals and voltage control signals are generated by summing voltage comparison signals with those proportional to voltage difference signals. Reference signals are generated for every source operated in parallel, proportional to appropriate voltage control signals. Extra signals are generated in proportion to d- and q-components of source current, as well as difference signals, comparison signals, signal of control over summation of comparison signals. Also generated are signals proportional to difference signals and signals proportional to d- and q-components of source current. Now modulating signals in abc-coordinate system are generated. |
Configuration of multi-level modular submerged power system / 2518163 Invention is related to the field of eclectic engineering and may be used in power supply systems supplying power to current collectors located far from the shore and under sea. The submerged power system (10) consists of a set of building blocks (12), (13) for modular power converters which are installed both at the side of power supply source (20) and the side of submerged current collector (30); they are united and interconnected in order to meet requirements to expansion of the operation area and configuration of the current collectors. The above power system (10) includes a transmission line/bus (14) which may transfer direct-current electric energy of high or medium voltage from the onshore facilities or upward side of the power supply source (20) to the set of submerged modules (18) of the current collector. The configuration of the multi-level modular power converter at the undersea side of the submerged power system (10) is symmetric to the configuration of the multi-level modular power converter at the onshore/upward side of the above system (10). |
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