直流微电网下垂控制技术研究综述

Overview of Droop Control in DC Microgrid

为了解决分布式能源发电问题，微电网成为可选方案之一被提出。相较于交流微电网，直流微电网更加适合目前的很多分布式电力设备。为了保证直流微电网的稳定运行，就需要制定一套行之有效的能量管理策略。其中如何解决能量管理底层控制中的电流分配问题，成为实现直流微电网系统中各组成单元可靠运行的关键。下垂控制作为典型的实现电流分配的方法，被广泛地研究和讨论。传统的下垂控制存在固有的局限性，因此需要二次控制通过补偿的方法进行改进。该文对不同的改进下垂控制进行了系统的分类和技术分析。最后，对比和总结了各种改进下垂控制的技术特点为该领域的进一步研究和发展趋势提供参考。

In order to solve the problem of distributed energy generation, microgrid has been proposed as one of the options. Compared with AC microgrid, DC microgrid is more suitable for many distributed power equipment. In order to ensure the stable operation of the DC microgrid, it is necessary to develop a set of effective energy management strategies. How to solve the problem of current sharing in the bottom control of the energy management has become the key to implementing the reliable operation of each component unit in DC microgrid system. The droop control is widely investigated and discussed as a typical method of implementing current sharing. Due to the inherent limitations of the traditional droop control, compensations brought by the secondary control are required to improve the overall performance. In this paper, different droop control methods were systematically classified and analyzed. Finally, the technical characteristics of various droop control were compared and summarized, which can provide references for the further research and development of this field.