分布式直流微电网分级控制技术综述

Review of Hierarchical Control of Distributed DC Microgrid

近年来,作为保证直流微电网稳定高效运行的一种有效技术方法,分级控制在国内外受到广泛关注。分级控制的实现通常建立在下垂控制之上,因此该文对基于下垂控制的直流微电网分级控制技术进行综述研究。首先,通过对已有下垂控制方法进行分析比较,系统地评述传统下垂控制方法的局限性。其次,针对传统下垂控制的缺陷,主要介绍了改进的主级控制、次级控制和第三级控制的分级控制方法,同时根据通信方式的不同,将次级控制分为三种协调控制方法。此外,该文着重讨论基于一致性算法的分布式次级控制在直流微电网应用中的优越性和协调控制所面临的通信问题及其解决方法。最后,对直流微电网下垂分级控制的现有研究技术进行对比总结,指出其目前存在的问题和未来发展趋势。

As an effective solution for the stable and efficient operation of DC microgrids(MGs),hierarchical contr-ol has received extensive attention at home and abroad in recent years.Considering that the realization of hierarchical control is usually based on droop control,the hierarchical control technology for DC MGs based on droop control is reviewed in this paper.First,through the analysis and comparison of the existing droop control methods,the defects of the traditional droop control method are systematically reviewed.Then,an improved hierarchical control method is introduced,including primary control,secondary control and tertiary control.Meanwhile,according to different communication modes,the secondary control is divided into three coordinated control methods.Furthermore,the advantages of distributed secondary control based on the consensus algorithm in DC MGs applications,as well as the communication problems faced by coordinated control and the corresponding solutions,are discussed.Finally,the existing research techniques of hierarchical control of DC MGs based on droop control are compared and summarized,and the existing problems and development trends in the future are pointed out.