A NOVEL CONTROL STRATEGY FOR HIGHPOWER HIGH-PERFORMANCE AC POWER SUPPLIES

摘要:The performances of the conventional currentregulated voltagecontrolled system with bipolar PWM are first analyzed in detail, then a novel control scheme suitable for highpower highperformance AC power supplies is present in this paper, which incorporates dual synchronous PWM technique of singlephase fullbridge inverter and multiple feedback loop. With this scheme, the output voltage of AC power supply can maintain highquality sine wave at low switching frequency and small output LC filter parameters. Moreover, it has excellent voltage regulation performance, fast dynamic response, good disturbance rejection, high nonlinear load compatibility, and small voltage modulation value. The validity of the proposed control scheme has been verified on a singlephase 30 kVA experimental prototype