ABRUPTLY VARIABLE LOAD REACTIVE POWER SENSOR FOR CONTROLLING STATIC REACTIVE POWER COMPENSATOR Russian patent published in 2013 - IPC H02J3/18 

FIELD: radio engineering, communication.

SUBSTANCE: reactive power sensor, having a current signal multiplier of the given phase of abruptly variable loads of the network and a reference sinusoidal voltage, cascade-connected band-elimination filters connected to the output of the multiplier, a low-pass filter connected to the output o the last band-elimination filter of the cascade, and a phase corrector connected to the output of the low-pass filter, according to the invention, further includes a differentiator, to the input of which a current signal is transmitted, and the output is connected to the current input of the multiplier, wherein the vector of the reference voltage of the multiplier is phase-locked to the vector of the voltage of given phase of the load. The differentiator is in form of an operational amplifier (DA) with a negative feedback through a resistor (R), to the inverting input of which the current signal is transmitted through a capacitor (C), and the non-inverting input of which is connected to the common bus (zero point).

EFFECT: high efficiency of operation of the reactive power sensor due to measurement of not only the reactive component of the load current, but also measurement of the derivative of its active current component, which is inherently reactive power of the dynamic mode of the load, which, overall, increases accuracy of compensation using a voltage fluctuation static compensator in a network with abruptly variable loads which cause flicker.

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