| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an apparatus which restrains three-phase voltage unbalanced state caused by heavy load of single phase in a three-phase distribution system. <P>SOLUTION: This three-phase unbalanced voltage restraining apparatus supplies a current to compensate each phase from the output of an inverter connected to a distribution line. The apparatus has a PWM signal generating means which is composed of a reverse phase current command signal generating unit possessing a three-phase two-phase converting circuit, a rotational coordinate reverse phase converting circuit, a reverse phase voltage zero control circuit, and a two-phase three-phase converting circuit; and a PWM drive pulse generating unit for controlling the output waveform of an inverter, as an inverter control signal generating means. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
