可再生能源2017，Vol.35Issue(1)：72-79,8.
直流微网中可抑制环流的并联变流器控制策略
Control strategy of paralleling converters to restrain circulating current in DC microgrid
宁雪姣 1杨洪耕 1沙熠 1陈铁敏2
作者信息
- 1. 四川大学电气信息学院,四川成都610065
- 2. 国网上海市电力公司,上海200063
- 折叠
摘要
Abstract
There are contradictoriness between voltage regulation and load sharing in traditional droop control strategy.Combined with characteristics of DC microgrid,an improved droop control strategy was proposed to insure the stability of DC bus voltage and accuracy of load sharing.Meanwhile,this strategy is effective to restrain the circulating current between parallel inverters.Firstly,the virtual resistance was imported into the output of each inverter,the initial value of the virtual resistance was determined aiming at reaching the minimum power loss,and the value was adjusted adaptively based on the output voltage difference between inverters to restrain the circulating current and reduce the bus voltage drop as much as possible.Then,a compensation current control was introduced to the input of controller to eliminate the impact of line resistance on the accuracy of load sharing,and the distributed voltage compensation control was applied to regulate bus voltage further.Finally,the characteristic equation of the system was utilized to analyze the stability of the system,and the proposed control strategy provided a theoretical guidance for engineering.Simulation experiments verified the effectiveness of the strategy.关键词
直流微网/并联变流器/环流抑制/改进下垂控制/自适应虚拟电阻Key words
DC microgrid/parallel inverter/circulating current/improved droop control/adaptive virtual resistance分类
信息技术与安全科学引用本文复制引用
宁雪姣,杨洪耕,沙熠,陈铁敏..直流微网中可抑制环流的并联变流器控制策略[J].可再生能源,2017,35(1):72-79,8.
