UNBALANCED VOLTAGE COMPENSATION METHOD, UNBALANCED VOLTAGE COMPENSATOR, THREE-PHASE CONVERTER CONTROL METHOD, AND CONTROLLER OF THREE-PHASE CONVERTER

摘要

In the imbalance compensation voltage of a three-phase alternating current, the instantaneous value of Y obtained in the Y-phase voltage of the wiring having from instantaneous value of the line voltage, a phase difference of 120 ° with each other. Typical three-phase to the target line-to-line voltage of the three-phase imbalance of the distribution system, using the conversion method of the Y-phase voltage by the center vector calculated from the line voltage and the phase difference from the instantaneous value of the three-phase unbalanced voltage of the line voltage, 120 ° to each other and derives the value of Y-phase voltage three-phase unbalance of the voltage and the instantaneous voltage of a minute image having. In the three-phase AC voltage to the power conversion of direct-current voltage and outputs the PWM conversion, the three-phase from each of the Y-phase voltage obtained from the Y-phase voltage to the center vector calculation step, the center vector calculation process to obtain with a phase difference of 120 ° from each other from the line voltage calculating symmetry minute step of calculating a symmetric minute voltage of the balanced type and to form a compensation signal to compensate for the unbalanced voltage of the three-phase AC voltage, the three-phase AC voltage PW M unbalanced conversion to generate a control signal for outputting a direct current voltage provided with a voltage compensation step ;