一种新型大功率高性能逆变电源的控制方案

A Novel Control Strategy for High-Power High-Performance Inverter Power Source

分析了采用双极PWM方式的带电流内环的电压控制系统的特性，提出了一种新型的适用于大功率高性能逆变电源的控制方案。该方案将单相全桥逆变器的二重化同步PWM技术与多环反馈控制方法结合起来，使逆变电源在开关频率不高及滤波器参数不大的情况下，输出电压仍然是低谐波含量的高品质正弦波，同时系统具有优异的稳压特性、动态特性、对非线性负载的适应性以及小的电压调制量。该控制方案的正确性已经在单相30KVA逆变电源实验样机上得到证实。

This paper presents a novel control scheme suitable for high-power high-performance inverter power source. The performances of the conventional current-regulated voltagecontrolled system with bipolar PWM are first analyzed in detail. The proposed control scheme incorporates dual synchronous PWM technique of single-phase full-bridge inverter and multiple feedback loop. Thanks to this scheme, the inverter power source output voltage can maintain high-quality sinewave at low switching frequency and small output filter parameters. At the same time, the system has excellent voltage regulation performance, fast dynamic response, high nonlinear load compatibility, and small voltage modulation value. The validity of the proposed control scheme has been verified on a single-phase 30kVA experimental prototype.