直流微电网研究综述

Overview on DC microgrid research

由于具有线路损耗低、输电能力强、电能质量好、控制简单等优势,直流微电网受到越来越多人们的关注,不断有关于直流微电网的研究成果面世。本文从拓扑结构、优化配置、控制技术等三个方面,总结梳理了直流微电网的研究现状。在拓扑结构方面,面对高密度分布式能源和多元负荷,如何综合设计系统结构,是直流微电网必须要解决的问题;优化配置是直流微电网设计规划的重要内容,也是提高系统运行效果、实现安全经济可靠的重要环节。直流母线电压控制策略在控制技术中广泛应用,但其在运行时会出现稳态电压偏差等问题,由此出现了对其效果进行修正的各种二次协调控制策略,这也将是未来直流微电网技术发展的关键和趋势。

Due to its advantages of low line loss, strong transmission capacity, high power quality and simple control, DC microgrid has received more and more attention, and continuous research results on DC microgrid have been published. This paper summarizes the research status of DC microgrid from three aspects, including topology structure, optimal configuration, and control technology. With the high density distributed energy and multiple loads, how to design the system structure comprehensively is the primary issue. Optimal configuration is an important part of DC microgrid design and planning. In order to improve system operation effect and achieve safety, economy and reliability. At present, DC bus voltage control strategy is widely used in control technology, while it has some disadvantages, such as steady-state voltage deviation in operation. So, various secondary coordinated control strategies have been derived to improve its effect, which will be the key and trend of the future development of DC microgrid technology.