直流微网研究中的关键技术

直流微网作为连接分布式电源与主网的一种微网形式,能高效地发挥分布式电源的价值与效益,具备比交流微网更灵活的重构能力。但由于直流电灭弧困难,直流微网系统的设计缺乏统一的标准与规范,直流微网的大规模推广应用将是一个长期过程。本文根据现有文献资料对直流微网研究中的控制技术、保护技术、结网方式、通信技术和电力电子接口电路等关键技术的现状做一个全面的阐述;最后,结合我国的电网国情,就直流微网在城市居民小区内的推广应用提出建议方案。

Key Technologies for DC Micro-Grids

DC micro-grids,as a self-management grid form of integrating distributed energy systems with utility power systems,will realize the value and benefit of the distributed energy resources efficiently and have a more flexible capability of reconfiguration.However,the barriers of its effective promotion are both the struggling quench of the DC current arc and the lack of common standards and guidelines,leading to a long conversion process mixed with conventional AC technologies and novel DC approaches.This paper presents a comprehensive overview of the current key technologies for DC micro-grid,including control,protection,netting modes,communication,power electronic converters,presenting with a goal of identifying DC micro-grid better.In the end,combined with China’s actual power system conditions,it is proposed a tailor-made scheme brought into the residential sub-districts in cities.