基于一致性算法的孤岛微电网协同控制  

Cooperative control of islanded microgrids based on consensus algorithm

作　　者：王晓兰[1] 曲利民[1] 张晓英[1] 包广清[1] 宫玮丽 

机构地区：[1]兰州理工大学电气工程与信息工程学院,甘肃兰州730050

出　　处：《兰州理工大学学报》2016年第5期77-83,共7页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(50967001);甘肃省自然科学基金(1107RJZA272)

摘　　要：针对交流微电网中接入不平衡负荷导致的公共连接点(point of common coupling,PCC)电压不平衡,下垂控制所产生的频率和电压幅值的偏差,以及电压变化引起的无功功率难以均分等问题,提出了基于一致性算法的分布式分层控制方法.通过与邻近单元之间实时的数据交换,采用一致性算法获得全局变量的平均值,并产生补偿量发送到一次控制进行调节,即使在各分布式电源(distributed generation,DG)初始状态不同的情况下,也能获得良好的控制性能.在MATLAB平台上,对一个低压交流微电网系统进行了仿真实验.结果表明,基于一致性算法的分布式分层控制,可有效补偿PCC的不平衡电压,恢复频率和电压幅值的偏差,均匀分配系统的无功功率,全面改善微电网的电能质量.Aimed at the problems such as voltage unbalance at the point of common coupling （PCC）, in- duced by connecting unbalanced loads into AC-microgrid, deviation of frequency and voltage amplitude produced by droop control, and the reactive power sharing becoming difficult due to voltage variation, a distributed hierarchical control method was proposed based on consensus algorithm. By means of realtime data exchange with adjacent units, the average value of global variable was obtained by using the consensus algorithm and was used to generate compensation quantity to adjust the primary control. Thus, a fine con- trol performance of the microgrid can be obtained even when the initial state of distributed generation （DG） is various. The MATLAB was used to conduct simulative experiment on a low-voltage AC-microgrid system. The result showed that the distributed hierarchical control based on consensus algorithm can com- pensate the unbalanced voltage of PCC, restore the deviation of frequency and voltage amplitude, distibute evenly the reactive power of system, and improve overall the power quality in microgrid.

关 键 词：协同控制 一致性算法 孤岛微电网 二次控制 

分 类 号：TM712[电气工程—电力系统及自动化]