摘要
无功功率-电压下垂与电压-无功功率下垂是多逆变器孤岛微网系统中两种典型的分布式电源无功控制方式。针对含异构分布式电源的微电网,提出了无功功率的分散分层控制策略:①通过改进空载电压,能够在阻抗不匹配的情况下实现无功功率的合理分配,并将公共连接点(PCC)电压恢复至额定值;②基于不同时间尺度搭建分层结构,能够满足微网静态和动态性能的需求;③摆脱传统控制中通信的制约,实现分布式电源即插即用效果。最后,小信号分析、时域仿真以及RT-LAB硬件在环仿真实验验证了控制策略的可行性和有效性。
The reactive power-voltage droop and the voltage-reactive power droop are two typical reactive power control strategies of distributed generators in the multi-inverter paralleled islanded microgrid.A decentralized and hierarchical reactive power distribution control strategy for the microgrid with heterogeneous distributed generators is proposed,whose characteristics include:①by adjusting floating voltage,the reactive power distribution error caused by the mismatched feeder impedance can be reduced and the voltage regulation can be achieved;②hierarchical structure is built based on multi-time scale,and both fast dynamic and static characteristics of microgrid are satisfactory;③the constraint of communication system in the traditional control is relieved,and the plug-and-play effect of distributed generators is achieved.Finally,simulation results verify the feasibility and effectiveness of the control strategy.
作者
赵梓杉
蒙志全
章雷其
赵睿
辛焕海
ZHAO Zishanx;MENG Zhiquan;ZHANG Leiqi;ZHAO Rui;XIN Huanhai(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China;State Grid Zhejiang Electric Power Research Institute,Hangzhou 310014,China;Jinan Power Supply Corporation of State Grid Shandong Electric Power Company,Jinan 250011,China)
出处
《电力系统自动化》
EI
CSCD
北大核心
2019年第11期59-67,共9页
Automation of Electric Power Systems
基金
国家重点研发计划资助项目(2017YFB0902000)
国家自然科学基金资助项目(U1766206)~~
关键词
无功功率分配
空载电压
分散控制
分层控制
下垂控制
reactive power distribution
floating voltage
decentralized control
hierarchical control
droop control