单三相光储型多微网黑启动恢复策略

近年来微电网大力发展,由其为子单元的多微网(multi-microgrids,MMGs)渐成为一种新型电网.作为结构及控制模式更加复杂的微电网群落,研究安全有效地黑启动以进入正常运行状态对提高供电可靠性具有重要意义.在分析含单三相复合混联的多微网结构及控制系统基础上,为使主电源高效运行,提出一种考虑三相不平衡度约束的多微电网黑启动策略,考虑源荷网条件选择最优的储能系统作为黑启动主电源,以先独立分散恢复再集中协调恢复的方式实现多微网的源荷网恢复.所提策略经验证有效可靠,可为多微网黑启动恢复提供一定的借鉴意义.

Black start strategy for photovoltaic energy storage system multi-microgrids with three-phase/single-phase

In recent years, with the development of microgrids, multi-microgrids (MMGs) have become a new type of power grids. As the community of microgrids with more complex structure and control mode, studies on safe and effective black start strategies for multi-microgrids are of great significance to improve the reliability of power supply. Based on the analysis of the network structure and the control system of the multi-microgrids with three- phase/single-phase architecture, to achieve the efficient operation of the main power supply, a black start strategy is proposed under the con-sideration of three-phase unbalance degree constraints. The energy storage system that meets the sources-loads-network conditions is selected as the main power supply of the MMGs, and after all sub-micogrids finish independent decentralized restoration, the centralized restoration is carried out to complete the MMGs black start procedure. The proposed method is demonstrated to be effective and reliable, which can provide some reference for the restoration of the multi-microgrids.