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Device to monitor efficiency of power usage in consumer power systems. RU patent 2458445.

Device to monitor efficiency of power usage in consumer power systems. RU patent 2458445.

FIELD: electricity.

SUBSTANCE: device to monitor efficiency of power usage in consumer power systems comprising a set of current and voltage sensors connected to a switchboard, a permanent memory, outputs of metering converters are connected via the switchboard with a memory unit, the input-output of which is connected with a calculator, and its outputs are connected with an input of an electronic indicator, the inputs of which are connected also with outputs of the memory unit, the control device and the decision-making unit, inputs of the latter are connected with outputs of the memory unit, the calculator and the input-output of the control device, which with its inputs-outputs is also connected to the interface device, the memory unit and the sensor screen, at the same time the control device input is connected with the timer output.

EFFECT: expansion of functional capabilities.

1 cl, 2 dwg

 


 

IPC classes for russian patent Device to monitor efficiency of power usage in consumer power systems. RU patent 2458445. (RU 2458445):

H02J3/24 - Arrangements for preventing or reducing oscillations of power in networks (by control effected upon a single generator H02P0009000000)
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Method for fast-acting control of active-power flow Method for fast-acting control of active-power flow / 2449446
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The method allows calculate the coordinates of the end of the of impedance in vector in the system of coordinates received by turning in the complex plane of resistances on the calculated angle and transferring along the axes of real numbers on a prescribed value. Voltage in the electrical center of rocking is modeled and the diapason of the values of this voltage corresponding to the diapason of the angles of electric transmission substantially different from zero and including the value of 180o is controlled. The asynchronous regime is fixed at the output of the value of modeled voltage out of the set diapason if the symbol of voltage differs from the symbol of this voltage at the input into the prescribed diapason and the duration of passing through the established diapason prevails the prescribed value. The position of the electrical center of rocking is defined at the moment of changing of the symbol of the modeled voltage according to the outfit of the value of the coordinates of the end of the vector of impedance along the coordinate axis to one of the three prescribed diapasons. The number of cycles of the asynchronous mode is additionally calculated according to the moments of changing of the symbol of modeled voltage in the established diapason of values and operation of automatic equipment is formed at prevailing the number of the cycles of the prescribed setting.
Method for improving dynamic stability and damping oscillations of electric-power systems and device for its realisation Method for improving dynamic stability and damping oscillations of electric-power systems and device for its realisation / 2339144
Invention is attributed to the field of electric engineering and can be used for improving dynamic stability of electric-power systems and for damping electromechanical vibrations of generator rotor. In the method for improving dynamic stability and vibrations damping, alternating current synchronous generator rotor speed is monitored and synchronous generator rotor speed is lowered after insertion disturbance into system up to the rotation rate of magnetic field by means of mechanical deceleration of mentioned generator rotor. Electromagnetic brake is mechanically linked with generator rotor and prime mover rotor via clutches, voltage on generator terminals and generator stator current is continuously measured by which parameters the generator electromagnetic power is determined. This power is compared with electromagnetic power value which existed before insertion of disturbance. When result of power comparison exceeds predefined value, control signal for electromagnetic brake switching on is generated. The value of decelerating torque is determined by difference between values of the measured electromagnetic power and the electromagnetic power which existed before disturbance insertion, and duration of decelerating torque application is determined by change in generator rotor speed. To do this the generator rotor speed after disturbance insertion is determined and compared with the value which existed before disturbance insertion. Electromagnetic brake is switched off when equality of current rotor speed and rotor speed in mode before disturbance is reached and when measured power is equal to the power which existed before disturbance insertion.
Method and device for electrical transmission system Method and device for electrical transmission system / 2406207
Device is designed to reduce subsynchronous resonance in electrical transmission systems and includes facilities (16), (17) to define voltage components from the side of stator windings in generator (9) with one or more discrete frequencies and calculation means taking into account the results of the said calculations, voltage to be added to the specified voltage of stator windings to reduce subsyncronous resonance in electrical system and a circuit (20) configured so that calculated voltage can be added to the specified voltage of stator windings.
Emergency control method of power of turbine generator of modular thermal power station (versions) Emergency control method of power of turbine generator of modular thermal power station (versions) / 2412512
As per the first version of the method there measured is output current and output voltage of turbine generator, active power is determined according to them, controlled and compared with reduction speed set points of active power and output voltage, and emergency imbalance of active power is calculated and compared to the set point. As per the second version of the method, the rotor speed is measured, rotor slip is determined relative to synchronous rotation speed and exceedance is controlled with the slide of the specified positive set point. As per the first and the second versions of the method, when set points are exceeded, there formed is pulse control impact on the turbine off-loading. As per the third version of the method, frequency of output voltage, rotor speed and flow of live steam before turbine is measured; negative rotor slip is determined relative to synchronous rotation speed, current power reserve of turbine is determined, exceedance is fixed with current turbine power reserve and with absolute value of rotor slip of the appropriate set points, and when frequency of output voltage is decreased to its set point, there formed is control impact on additional loading (forcing) of turbine, which is proportional to current reserve of its power.
Thyristor-controlled series capacitor damping subsynchronous resonances Thyristor-controlled series capacitor damping subsynchronous resonances / 2433517
Control unit (17) for a thyristor-controlled series capacitor connected to a electric power transmission line (12) comprises a control unit integrating a thyristor start control (18) and a generator of required voltage of the capacitor passing through zero depending on line current and voltage of the capacitor in response on a command signal, and a command control (19) which is used to generate the command signal for the thyristor start control, and accommodates a command damping control (24) comprising a damping unit at least on one discrete frequency.
Method for fast-acting control of active-power flow Method for fast-acting control of active-power flow / 2449446
During regulation of active-power flow between power system parts connected with power line (1), unbalance of active power on shaft (11) of generating unit is monitored, active-power flow over line (1) is changed by adjusting phase angle between voltage vectors in its end-points on buses (2) and (3) by means of controlled phase-slue device (12) included in line (1). Limited time interval is allocated, within which unbalance of active power is compensated by means of transferring electric energy accumulator (7) into discharging or charging mode when there is deficiency or excess of active power respectively, and power balance is restored by corresponding changing power generated by unit.
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