基于三端口双向直流变换器的负序电流平衡方法的研究

Research on the Negative-Sequence Current Balancing Method Based on Three-port Bi-directional DC-DC Converter

本文提出一种基于三端口双向直流变换器的新型负序电流平衡方法及其拓扑,该方法通过三端口双向直流变换器实现了三相电网间的有功能量交换,能有效改善电网三相电流不平衡问题。本文分析了电路基本工作原理,提出了系统的三相负序平衡控制策略。仿真结果验证了本文提出控制策略的有效性以及负序电流平衡方法的可行性。在合适的控制策略下,本拓扑能同时实现对包括负序、无功和谐波电流在内的综合补偿。

This .paper presents a new negauve-sequence current balancing method based on three-port bi-directional DC-DC converter as well as its topology. The method can achieve active power exchanging among three-phase power grid to imProve the problem of three-phase imbalance.effectively through the three-port bi-direction DC-DC converter. The operation principle of the topology has been analyzed in detail, and then the negauve-sequence current balancing control strategy was proposed in this paper. The effectiveness of the control strategy and the feasibility of the negativesequence current balancing method were verified by the simulation results. The topology can simultaneously compensate the negative-sequence, reactive and harmonic currents under the appropriate control strategy.