一种交流传动大功率并联逆变器的设计

Design of a High Power AC Drive Parallel Inverter

逆变器并联扩容方法是实现大容量交流电机的驱动的有效途径,但该方式需要解决环流问题。通过建立并联逆变器的等效电路模型分析环流产生机理和影响因素,对影响因素进行约束并采用脉冲同步主从控制方案设计了一套大功率并联逆变器,解决了环流问题,电机控制性能不受影响。试验结果和现场应用效果表明该并联逆变器均流良好,控制性能良好,简单可靠,可满足工程现场要求。

The parallel expansion of inverters is an effective way to drive large capacity AC motor,but it needs to solve the problem of circulating current. The equivalent circuit model of parallel inverter was established to analyze the generation mechanism and influencing factors of circulating current. A set of high-power parallel inverter was designed by restricting the influencing factors and using the master-slave control scheme of pulse synchronization. The circulating current problem was solved and the motor control performance was not affected.The test results and field application results show that the parallel inverter has good current sharing and control performance,simple and reliable,and can meet the engineering requirements.