交直流混合微电网系统设计与控制架构分析

微电网是实现大规模分布式电源接入配电网的重要技术途径和手段,其中交直流混合微电网综合了交流微电网和直流微电网各自的优势,已经成为微电网技术发展的重要方向。以国家863项目示范工程"交直流混联微电网上虞示范站"为背景,从拓扑结构设计、关键研发设备和分层控制架构等方面介绍其主要技术特征。重点阐述了该交直流混合微电网的协调控制策略,包括四种运行模式和八种模式切换流程,并结合实际运行结果进行验证。运行实践表明,示范工程能够显著提高负荷的供电可靠性,促进高比例分布式电源就地消纳,对未来交直流混合微电网技术的发展具有一定指导意义。

System design and control framework analysis of hybrid AC-DC microgrid

Microgrid provides a promising solution for large scale penetration of Distributed Generations (DGs) into the distribution network. Particularly, the hybrid AC-DC microgrid with the advantages of both AC and DC microgrids has become an important direction for the development of microgrid technology. Based on the demonstration project of 863 Program named Hybrid AC-DC Microgrid Shangyu Demonstration Substation, the main technical features of the demonstration hybrid microgrid are introduced, including topology design, key equipment and hierarchical control framework. The coordination control strategy is described in detail, including four operation modes and eight mode transition processes. The operation result shows that the demonstration project can significantly improve the reliability of power supply and accommodate high penetration of DGs, which is of certain guiding significance for the future development of hybrid AC-DC microgrid technology. This work is supported by National High-tech R & D Program of China (863 Program) (No. 2015AA050104).