电力电子技术

建立高效、可靠的多电压等级直流配用电系统是促进可再生能源与分布式电源发展的重要途径。近年来,直流电网得到了的广泛应用,集群式的直流配电网络迅速出现,为了更好地发挥配电系统传输效用,多个电压等级的直流网络联合运行具备着明显的优势。因此,提出了一种能够联系两个不同电压等级双极直流系统的拓扑结构,该拓扑具有部分功率传输功能,运行效率优越,并且能够在不增加额外装置的情况下均衡双极功率流。首先,对所提拓扑的工作原理进行分析,其次,针对变换器的软开关范围进行论述,最后,搭建了实验平台.对拓扑的有效性进行了验证。

Establishing an efficient and reliable multi-voltage-level DC distribution power system is an important way to promote the development of renewable energy and distributed power sources.In recent years,DC microgrids have been widely used and cluster DC distribution networks have rapidly emerged.In order to better utilize the transmission efficiency of distribution systems,the joint operation of multi-voltage-level DC networks has obvious advantages.Therefore,a topology is proposed that can connect two bipolar DC systems with different voltage levels.This topology has partial power transmission function,superior operating efficiency and can balance bipolar power flow without adding additional devices.Firstly,the article analyzes the working principle of the proposed topology,then discusses the soft switch range of the converter and finally an experimental platform is built to verify the effectiveness of the topology.