微网逆变器不平衡电压协调补偿边界分析与计算  

Analysis and Calculation of Coordinated Compensation Boundary for Unbalanced Voltage of Microgrid Inverter

作　　者：赖纪东 徐洁洁[1,2] 苏建徽 谢天月[1,2] 崔玉妹 LAI Jidong;XU Jiejie;SU Jianhui;XIE Tianyue;CUI Yumei(School of Electrical and Automation Engineering,Hefei University of Technology,Hefei 230009,China;Research Center for Photovoltaic System Engineering of Ministry of Education(Hefei University of Technology),Hefei 230009,China)

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]光伏系统教育部工程研究中心(合肥工业大学),安徽省合肥市230009

出　　处：《电力系统自动化》2022年第6期127-136,共10页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51541703)。

摘　　要：孤岛微电网下,微网逆变器参与系统电压不平衡补偿是改善网内电压质量的重要方式之一。然而,在严重负载不平衡条件下,可能出现即使微网逆变器容量充足,也无法实现逆变器端口和公共连接点(PCC)不平衡电压同时补偿的情况。为此,文中从微网逆变器端口和PCC电压不平衡协调补偿机理入手,首先讨论了不平衡电压协调补偿影响因素,接着详细分析推导了协调补偿边界条件,并由此提出了一种不平衡电压补偿边界定量计算方法。该方法以微网逆变器端口电压不平衡度与PCC电压不平衡度为约束条件,求解出微网逆变器协调补偿临界电流值。最后,分别基于MATLAB/Simulink软件及Starsim半实物仿真平台搭建了仿真和实验平台,仿真及实验结果验证了协调补偿边界理论分析的正确性及所提方法的有效性。In the islanded microgrid, the microgrid inverter participates in the compensation of system voltage unbalance, which is one of the important ways to improve the power quality in the microgrid. However, under the condition of serious load unbalance,it may occur that the unbalanced voltages at the inverter port and the point of common coupling(PCC) cannot be compensated simultaneously even if the microgrid inverter has a sufficient capacity. Therefore, on the basis of theoretical analysis of coordinated compensation mechanism for unbalanced voltage both at the microgrid inverter port and PCC, the influencing factors of coordinated compensation for unbalanced voltage are firstly discussed. And then the coordinated compensation boundary conditions are analyzed and deduced in detail. Consequently, a quantitative calculation method of unbalanced voltage compensation boundary is proposed.This method takes the voltage unbalance degrees at the microgrid inverter port and PCC as the constraint conditions to obtain the critical current value of the coordinated compensation of the microgrid inverter. Finally, a simulation platform and an experimental platform are established based on the MATLAB/Simulink and the Starsim hardware-in-the-loop simulation platform, respectively.The simulation and experimental results verify the correctness of the theoretical analysis of coordinated compensation boundary and the effectiveness of the proposed method.

关 键 词：微电网 逆变器 不平衡负载 电压不平衡 协调补偿 

分 类 号：TM464[电气工程—电器]