| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress harmonic current by achieving highly accurate current control in power conversion equipment for superposing an AC side output of an inverter circuit on a power supply to acquire desired DC voltage. <P>SOLUTION: The inverter circuit 100 in which one single-phase inverter or more are connected in series is connected to an AC power source 1 in series, a smoothing capacitor 3 is connected to the subsequent stage thereof through a converter circuit 300 by semiconductor switch elements 101a to 104a, a short-circuit time T for bypassing the smoothing capacitor 3 is provided within one period to control the converter circuit 300, and a current command is used so as to make the voltage of the smoothing capacitor 3 target voltage to control the inverter circuit 100 so as to improve the power factor of the AC power source 1. Upon switching control over between the short-circuit time T and the other time, the inverter circuit 100 is subjected to feed-forward control so as to add/subtract the output voltage of the inverter circuit 100 for the voltage of the smoothing capacitor 3. <P>COPYRIGHT: (C)2012,JPO&INPIT |
