考虑自适应虚拟阻抗的微电网分布式功率控制策略  

Distributed Power Control Strategy for Microgrids Considering Adaptive Virtual Impedance

作　　者：郭倩[1] 林燎源[1] 武宏彦 白志红[1] 马皓[1] 

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027

出　　处：《电力系统自动化》2016年第19期23-29,共7页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51177149);高等学校博士学科点专项科研基金资助项目(20130101110108)~~

摘　　要：针对低压微电网中,采用传统有功功率—电压幅值下垂控制的分布式电源在阻抗不匹配时难以按照下垂系数合理分配负荷有功功率的问题,提出了一种基于自适应虚拟阻抗的分布式功率控制策略,有效补偿了不匹配的馈线阻抗引起的电压降差异,实现了负荷功率的合理分配。所提策略基于多智能体一致性理论,构建了分布式的控制结构,各分布式电源仅需使用本地和相邻电源的功率信息对虚拟阻抗的模进行自适应调节,避免了对全局信息的依赖。通信网络拓扑中包含生成树的系统需求易于通过稀疏网络实现。同时,根据输出功率因数调节虚拟阻抗的阻抗角,增强了系统的鲁棒性。仿真结果证明了所提策略的有效性和可行性。In low-voltage microgrids,distributed generators（DGs）with conventional active power-voltage magnitude droop controller cannot share active power in inverse proportion to their droop coefficients in the presence of impedance mismatch.A distributed power control strategy based on adaptive virtual impedance is proposed to solve this problem.The strategy effectively compensates the difference of the voltage drops caused by mismatched feeders,hence accurate power sharing can be realized.Based on consensus of multi-agent systems,the strategy utilizes a distributed control structure.Each DG unit only employs local and neighboring power information to adjust the adaptive virtual impedance,avoiding the requirement for system global information.The system requirement that the communication topology includes a spanning tree can be satisfied with a sparse communication network.Meanwhile,the impedance phase is adjusted according to the power factor angle,which improves system robustness.Simulation results validate the effectiveness and feasibility of the proposed strategy.

关 键 词：微电网(微网) 下垂控制 功率分配 自适应虚拟阻抗 分布式控制 多智能体系统 

分 类 号：TM727[电气工程—电力系统及自动化]