Resonance suppression device

摘要

The present invention whose object is to reduce compensation current at the time when suppressing harmonic distortion caused by harmonic voltage, to reduce capacitance of an inverter, a resonance suppression device configured to suppress resonance which occurs when a power facility such as a wind power generator is connected to a power system includes: an inverter configured to supply alternating current to the power system, the inverter being in parallel with the power facility; a current command value generation unit in which voltage at a connection point between the power facility and the power system is inputted thereto and a current command value is obtained by multiplying, by a transfer function, a harmonic component contained in the voltage at the connection point; and a current control unit configured to control the alternating current outputted from the inverter based on the current command value.

主权项

1. A resonance suppression device configured to supply compensation current to a power system from a power conversion device connected to the power system, to suppress resonance which occurs with a power facility being connected to the power system, the resonance suppression device comprising:
a current command value generation unit whereto voltage of the power system is inputted, the current command value generation unit being configured to multiply, by a transfer function, a frequency component obtained by eliminating a fundamental wave component from frequency components contained in the inputted voltage, to generate a current command value with respect to the power conversion device, the current command value generation unit being configured to output the current command value to the power conversion device, to supply the compensation current to the power system, wherein the current command value generation unit includes
a first filter configured to extract a frequency component obtained by eliminating a fundamental wave component from frequency components contained in an inputted voltage, to output the resultant,a second filter configured to extract a frequency component obtained by eliminating a fundamental wave component from frequency components contained in current supplied from the power facility to the power system, to output the resultant, anda coefficient control unit configured to control a coefficient of the transfer function based on an output value of the second filter, and voltage of the power system multiplied by the transfer function is inputted to the first filter and an output value thereof is used as the current command value, or voltage of the power system is inputted to the first filter; an output value thereof is multiplied by the transfer function; and the resultant output value is used as the current command value.