三端口双向直流变换器的负序平衡应用

基于三端口双向直流变换器能实现各端口之间有功能量自由传输的特点，提出了其在负序电流平衡方面的新型应用方法及电路拓扑．该方法克服了传统负序电流平衡方法不能实现三相桥臂之间有功能量交换的问题，能有效改善三相电网的不平衡问题．本文对三端口双向直流变换器工作原理、负序电流平衡方法，以及基于该方法的负序平衡系统容量关系进行了详细分析，提出了系统控制策略．通过仿真验证了三端口双向直流变换器负序平衡应用的可行性及系统控制策略的有效性．在合适的控制策略下，本拓扑能同时实现包括负序、无功和谐波电流在内的综合补偿．

Application of three-port bi-directional DC-DC converter for negative-sequence current balancing

This paper presents a new three-phase negative-sequence current balancing method as well as its topology based on three-port hi-directional DC-DC converter. Active power exchanging among three-phase power grid can be achieved through the proposed method. The operation principle of the topology and the capacity of balancing system have been analyzed in detail, and then the negative-sequence current balancing control strategy is proposed. The effectiveness of the control strategy and the feasibility of the negative-sequence current balancing method are verified by the simulation results. The topology can simultaneously compensate the negative-sequence, reactive and harmonic currents under the appropriate control strategy.