Independent power supply in dc side is effective to restrain the zero sequence current of hybrid inverter. Taken the ac drive system powered by hybrid inverters as the object, based on the energy exchange relationship between inverters and motor load, this paper has presented a capacity voltage control strategy. In addition, a master-slave vector control system in rotating coordinates has been established in combination with master-slave control structure and asynchronous motor vector control strategy. Simulation and experimental results show that: through increasing the active current reference associated with capacitance voltage fluctuations in the primary inverter current control, capacitor voltage can be effectively stabilized. Meanwhile, on the premise of capacitance voltage stability, the slave inverter can dynamically compensate the primary harmonic current produced by main inverter, making the motor current distortion rate less than 5%.%直流侧独立供电是抑制混合型逆变器零序环流的有效方法.以混合型逆变器供电的交流传动系统为对象,在分析主从逆变器和电机负载之间能量交换关系的基础上,提出一种直流电容稳压控制策略,并结合主从式控制结构和异步电机矢量控制策略,建立旋转坐标系下的混合型逆变器主从式矢量控制系统.仿真和实验结果表明:通过在主逆变器电流控制环节增加与电容波动电压相关的有功电流参考量,能有效实现电容电压的稳定控制,同时在电容电压稳定的前提下,从逆变器可以动态补偿主逆变器产生的主要谐波电流,使得电机电流总畸变率低于5%.
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