新型交直流混合微电网拓扑及其可靠性分析

摘要

交直流混合微电网综合了交流微电网和直流微电网的优点,是未来智能电网的发展趋势之一,而拓扑结构和可靠性研究是交直流混合微电网发展的基础.参考现有微电网拓扑结构,结合交直流混合微电网的构成和运行方式,提出了3类新型交直流混合微电网拓扑,分别是一对多型(一个交流微电网与多个直流微电网)、多对一型和多对多型,根据3类拓扑自身的特点,指出了各自的适用场景;基于配电网可靠性分析方法,考虑分布式电源接入和微电网孤岛运行,提出了交直流混合微电网的可靠性计算方法;通过算例,对比和分析了提出的3类新型交直流混合微电网拓扑的可靠性.%Hybrid AC/DC microgrid combines the advantages of AC microgrid and DC microgrid, which is one of the future trends of smart grid development.The topology and reliability research are the basis of hybrid AC/DC microgrid development.Based on the existing microgrid topology and the composition and operation mode of hybrid AC/DC microgrid, this paper proposes three new types of hybrid AC/DC microgrids, which are one-to-many (an AC microgrid and multiple DC microgrids), many-to-one and many-to-many.According to the characteristics of the three types of topologies, the respective application scenarios are pointed out.Based on the reliability analysis method of distribution network, the reliability calculation method of hybrid AC/DC microgrid is put forward by considering the distributed power supply and the operation of micro-grid islanding.The reliabilities of the proposed three types of topologies are analyzed and compared through an example.