An Integrated Series-Parallel Microgrid Structure and its Unified Distributed Control

Xiaohai Ge, Hua Han, Wenbin Yuan, Yao Sun, M. Su, Xin Zhang, Koh Leong Hai
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引用次数: 5

Abstract

This paper presents an integrated series-parallel microgrid(MG), where a few distributed generation(DG) units in series type are used to form a DG string, then DG strings supply power to the common load in parallel type. With this structure, low-voltage devices could be integrated into MG without DC-DC boost converters. It provides a more flexible and efficient way to form higher voltage level MG. But it is difficult to find a decentralized control method to achieve power balance for this integrated system because of the difference between power transmission characteristics of parallel and series converter system. For this proposed MG in island mode, a unified distributed control strategy is proposed. With low bandwidth communication, accurate power sharing can be realized by exchanging information between the first converters connected to the bus of adjacent DG strings and between adjacent converters inside each DG string. Because the central controller is not used, the communication pressure of the system is reduced and the reliability is guaranteed. Simulation test has verified the feasibility and validity of the proposed control strategy.
串并联集成微电网结构及其统一分布式控制
本文提出了一种串联微电网,将若干台串联型分布式发电机组组成分布式发电串,由分布式发电串向并联型公共负荷供电。通过这种结构,可以将低压器件集成到MG中,而无需DC-DC升压转换器。它提供了一种更灵活、更有效的方式来形成更高电压级别的MG。但由于并联变换器与串联变换器的输电特性不同,很难找到一种分散控制方法来实现该集成系统的功率平衡。针对孤岛模式下的MG,提出了一种统一的分布式控制策略。在低带宽通信中,通过连接到相邻DG串母线上的第一转换器之间以及每个DG串内相邻转换器之间的信息交换,可以实现精确的功率共享。由于不使用中央控制器,降低了系统的通信压力,保证了系统的可靠性。仿真试验验证了所提控制策略的可行性和有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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