Patent ID: 9190935
Filing Date: 2015-11-17
Classification: H02M,H02P

Abstract:
1. A power regenerative converter comprising: a power conversion unit configured to convert AC power supplied from an AC power supply into DC power and convert DC power into AC power to be supplied as regenerative electric power to the AC power supply; an LCL filter including a reactor unit having a plurality of reactors connected in series between the power conversion unit and the AC power supply, and capacitors each having one end connected to a series connection point of the reactors in the reactor unit; a drive control unit for controlling the power conversion unit based on a first voltage command, the drive control unit being electrically connected to the power conversion unit; and a voltage command compensation unit configured to calculate a compensation value by obtaining a first value by performing a filtering process with a low pass filter on an estimated capacitor voltage, the capacitor voltage being a voltage at the series connection point of the reactors, and multiplying the first value by a coefficient to calculate the compensation value, the voltage command compensation unit including an adder to add the compensation value to a second voltage command based on a target current; and a current detecting unit for detecting a current flowing between the power conversion unit and the AC power supply, the AC power supply being a three-phase AC power supply, wherein the voltage command compensation unit is configured to estimate the capacitor voltage based in part on the current detected by the current detecting unit, and the voltage command compensation unit calculates the compensation value in accordance with the estimated capacitor voltage, and wherein the first voltage command is output to the drive control unit.