多变流器并联系统零序电流控制方法分析

Analysis of zero-sequence circulating current control method in parallel system of converter

新能源技术的发展要求电力电子设备不断提高功率,促使了电力电子设备并联系统的产生。文中通过分析多个变流器并联系统的平均值模型,对多变流器并联系统的零序电流产生的原因进行了简单的分析,给出了两种可行的零序环流抑制方法。为了进一步分析两种方法的效果,文中建立了SIMULINK仿真模型。仿真结果表明,PI控制和无差拍控制均可对零序环流有较好的抑制作用。但是PI控制的抑制效果更加稳定,更加适合实际应用。

The development of new energy technology requires the power electronic equipment to increase power constanly,which leads to the generation of parallel system of power electronic equipment.In this paper,the reason of zero-sequence current of parallel converter was analyzed through the mean value model of multiple parallel converter system.Then,two methods of reducing zero-sequence circulating current were proposed.In order to further analyze the effect of the two methods,a SIMULINK simulation model was established.The simulation results show that both the PI control and deadbeat control can suppress the zero-sequence flow.But the control effect of PI control is more stable and more suitable for practical application.