一种离网型并联逆变系统鲁棒电压控制方法  

A Robust Voltage Control Scheme for Parallel Inverter System Operating in Islanded Mode

作　　者：卢永辉 陈智勇[2] LU Yong-hui;CHEN Zhi-yong(Hunan Engineering Laboratory for PhatovoItaic System Control and Optimization,Xiangtan 411004,China)

机构地区：[1]光伏发电系统控制与优化湖南省工程实验室,湖南湘潭411004 [2]湖南大学电气与信息工程学院,湖南长沙410082

出　　处：《电力电子技术》2019年第1期23-25,共3页Power Electronics

基　　金：湖南省自然科学基金(2017JJ5031)~~

摘　　要：针对带非线性负载的离网型并联逆变系统,设计了一种鲁棒电压控制方法。该电压控制采用串级结构:电压反馈补偿环节、电流跟随内环、比例-谐振-微分(PRD)电压控制外环。电压反馈补偿环节和电流跟随内环实现逆变滤波系统的降阶,便于外环控制器的设计;PRD电压控制外环对基波和特征次谐波分量采取并行准谐振控制,微分环节可进一步降低闭环系统阶次。所提鲁棒电压控制方法无需引入额外负载电流反馈补偿项,便可实现抵抗负载电流扰动,实现高精度电压跟随效果,避免补偿项采样和计算延时引起的低鲁棒性问题。实验结果表明:所提出的鲁棒电压控制方法能够提高并联逆变系统的功率均分效果,降低逆变系统之间的环流,具备抵御非线性负载扰动的能力。A robust voltage control scheme for islanded parallel inverter in the case of non-linear loads is proposed. The cascade control structure includes voltage-feedback compensation,current tracking inner loop and proportionalresonance-defercntial(PRD)voltage outer loop.The reduced inverter-filter system can be guaranteed by using the voltage-feedback compensation and the current tracking inner loop.The PRD voltage outer loop is used to control fundamental and specific harmonic component.Also,the differential term is used to further reduce the order of the closedloop system.The improved disturbance-rejection ability and high-accuracy voltage tracking ability can be achieved without involving extra load current feedback compensation terms.Also,the robustness deterioration of the controller can be avoided which is caused by the sampling and calculating delay.Finally,the experimental results indicate that the proposed controller can effectively improve power sharing among parallel inverters deducing the circulating current,also possessing high disturbances-rejection ability to nonlinear load.

关 键 词：逆变系统 离网 电压控制 

分 类 号：TM464[电气工程—电器]