SENSOR REZKOPEREMENNOY reactive power load to control static var compensator

摘要

The invention relates to electrical engineering and is intended for control of reactive power rezkoperemennyh loads (RPN) industries, such as electric arc furnaces, through thyristor static compensators (STK), wherein the reactive power is the main sensor dynamic link STK control system controller.; The technical result is to increase the efficiency of the sensor of reactive power by measuring not only the reactive component of the load current, but also the measurement of the derivative of its active component of the current, which is inherently reactive power dynamic load conditions which increases the overall accuracy of the compensation (suppression) via STK voltage fluctuations in the network RPN, causing flicker.; The technical result is achieved in that the sensor reactive power rezkoperemennoy load comprising a multiplier signal current of this phase RPN network and the reference sinusoidal voltage, the cascade included notch filters, the number of which is determined by the permissible error from the action of discrete harmonic multiplier output signal, and their frequencies are multiples of the mains frequency voltage connected to the output of the multiplier, a low pass filter connected to the output of the last stage notch filter and a phase corrector, Port Inonii yield low frequency filter according to the utility model further comprises a differentiator which is connected to the input current signal, and an output connected to the current input of the multiplier, the reference voltage vector in phase multiplier vector phase of the load voltage.; In this case the differentiator is made in the form of an operational amplifier DA with negative feedback through resistor R, to the inverting input of which a signal current flows through the capacitor C, and the non-inverting input of which is connected to a common bus (the "zero point"). 1 NP, ZP 1, 2 Fig.