交直流混合微电网中变流器直流故障穿越技术研究  

Research on DC Fault Crossing Technology of Converter in AC/DC Hybrid Microgrid

作　　者：李建伟[1] 刘刚[1] 孙健[1] 钦焕波[1] LI Jian-wei;LIU Gang;SUN Jian;QIN Huan-bo(XJ Group Corporation,XJ Electric Co.,Ltd.,Xuchang 461000 China)

机构地区：[1]许继集团有限公司、许继电气股份有限公司,河南许昌461000

出　　处：《自动化技术与应用》2020年第11期81-85,106,共6页Techniques of Automation and Applications

摘　　要：在交直流混合微电网的推广应用中,直流短路是一个需要面对的重要问题,而直流故障穿越是系统中设备必备的能力。本文首先介绍了混合微电网的系统架构,明确了现有DC/AC变流器在面对直流短路时存在的问题;其次,提出了一种直流侧带自阻断能力的变流器拓扑,结合具有直流故障在线检测能力的故障穿越控制保护策略,分析了直流故障穿越的机理和控制保护过程;最后,对直流故障穿越方案进行仿真及实验验证,验证结果表明了所提直流故障穿越方案的有效性。In the promotion and application of AC/DC hybrid microgrid, DC short circuit is an important problem to be faced, and DC fault traversing is an essential capability of equipment in the system. Firstly, the system architecture of hybrid microgrid is introduced, and the existing problems of DC/AC converters in the face of DC short circuit are clarified. Secondly, a converter topology with self-blocking capability on the DC side is proposed, combined with the fault traversing control protection strategy with DC fault online detection capability, the mechanism of DC fault traversal and the control protection process are analyzed. Finally, the DC fault traversing scheme is verified by simulation and experiments. The verification results show the effectiveness of the proposed scheme.

关 键 词：微电网 直流短路 闭锁保护 故障穿越控制保护策略 

分 类 号：TM721.1[电气工程—电力系统及自动化]