新型配电网动态电压调节器拓扑结构研究

Research on Novel Topology of Dynamic Voltage Regulator for Distribution Network

针对含高比例可再生能源接入的配电网电压波动问题,提出了一种新型直接式AC/AC变换器拓扑结构,用于配电网柔性动态电压调节。所提变换器将传统双极性桥臂分离成正向电流桥臂(P-Leg)和负向电流桥臂(N-Leg),然后通过2个分离电感汇集到一起,克服了传统全桥型双向开关换流时引起的电压畸变问题,实现了双极性电压的输出。在理论分析的基础上,通过仿真和搭建实验系统验证了所提方案的可行性和有效性。

A novel topology of direct AC/AC converter was proposed to solve the voltage fluctuation problem of distribution network with high proportion of renewable energy access,which could be used for flexible dynamic voltage regulation of distribution network.The proposed converter separated traditional bipolar bridge legs into positive current leg(P-Leg)and negative current leg(N-Leg)and then assembled together by two separation inductors,therefore,it did not have the voltage distortion problems caused by the commutation of the full-bridge bi-directional switches,which could gain bipolar output voltage.On the basis of theoretical analysis,the feasibility and effectiveness of the proposed scheme are verified by simulation and experimental results.