基于虚拟电容的微网逆变器无功均分控制策略  

Reactive Power Sharing Control Strategy for Microgrid Inverters Based on Virtual Capacitor

作　　者：徐海珍[1] 张兴[1] 刘芳[1] 石荣亮 毛福斌 倪华[2] 

机构地区：[1]合肥工业大学电气与自动化工程学院,安徽省合肥市230009 [2]阳光电源股份有限公司,安徽省合肥市230088

出　　处：《电力系统自动化》2016年第19期59-65,共7页Automation of Electric Power Systems

基　　金：国家高技术研究发展计划(863计划)资助项目(2015AA050607)~~

摘　　要：在采用下垂控制的多逆变器微网系统中,针对线路阻抗差异所导致逆变器无功功率不均分问题,提出了基于虚拟电容的无功均分控制策略。该控制策略通过算法模拟逆变器输出端的并联电容特性,并根据线路阻抗差异自适应补偿线路阻抗压降,减小基频环流,提高系统无功均分能力。所提控制策略无需改变下垂特性,且无需检测公共点电压和线路阻抗参数,简化并改进了微网逆变器的无功均分控制。仿真和实验验证了所提方案的有效性。Aiming at reactive power sharing problem due to line impedance voltage mismatch in multi-inverters paralleled microgrid system with conventional droop control method,apower sharing strategy of virtual capacitor is proposed.The method adopts an algorithm to mimic inverter output paralleled capacitor characteristic,and adaptively compensates the line impedance voltage drop to reduce circulating current and improves the power sharing ability.Droop coefficients changes and detection of point of common coupling（PCC）voltage are not needed in the method,which enhances the adaptability of the inverters.Simulation and experimental results verify the effectiveness of the proposed control strategy.

关 键 词：微网(微电网) 逆变器并联系统 功率均分 虚拟电容 下垂控制 无功环流 

分 类 号：TM464[电气工程—电器]