构建煤层气地面抽采直流微电网系统的关键技术与可行性分析

Key technologies and feasibility analysis of DC micro-grid system for CBM ground extraction

直流微电网与交流微电网相比具有能量变换装置少、控制结构简单、无需考虑涡流损耗和无功补偿等诸多优点,已成为分布式能源高效利用及柔性直流配电领域的研究热点。然而绝大多数研究关注直流微电网在未来住宅和智能楼宇中的应用,以及网内分布式电源的灵活控制和能量管理,对具有能源行业应用背景和自身负荷特性的煤层气地面抽采直流微电网系统缺少深入的研究。结合煤层气地面抽采供电网络和用电负荷特性,初步提出了一种煤层气地面抽采直流微电网供电系统分层拓扑结构,总结分析了构建煤层气地面抽采直流微电网系统涉及的关键技术,并对煤层气地面抽采直流微电网系统可行性进行了分析和展望。

Compared with AC microgrid,DC microgrid has the advantages of few energy conversion devices,simple control structure,no consideration on eddy current and reactive power,and so on.It has become a research hotspot in the field of efficient utilization of distributed energy resources(DERs)and flexible DC distribution.However,most of the research focuses on the application and development of DC microgrids in future residential and intelligent buildings,as well as the optimization and coordination of DERs in DC microgrids,which lacks in-depth research on the DC microgrid system for CBM ground extraction with the application background and self load characteristics of the energy industry.Combined with the power network for coalbed methane(CBM)ground extraction and electrical load characteristics,the DC microgrid hierarchical topology system for CBM ground extraction was proposed in this paper.In addition,the key technologies to build DC microgrid system for CBM ground extraction were summarized and analyzed,and the feasibility of implementing a DC microgrid system for CBM ground extraction was analyzed and overviewed.