基于UPFC对微电网不平衡电压的治理  

Control of unbalanced voltage in micro-grid based on UPFC

作　　者：舒小婷 唐忠 Shu Xiaoting;Tang Zhong(School of Electrical Engineering,Shanghai University of Electric Power,Shanghai 200090,China)

机构地区：[1]上海电力大学电气工程学院

出　　处：《电测与仪表》2019年第21期57-62,共6页Electrical Measurement & Instrumentation

摘　　要：针对微电网公共连接点(PCC)三相电压不平衡的问题,提出一种在公共连接点接入统一潮流控制器(Unified Power Flow Controller,UPFC),通过向输电线路中注入负序电压来治理微电网PCC三相不平衡电压的控制策略。分析了UPFC的工作原理;提出了功率解耦控制方法,建立了UPFC在正、负序同步旋转坐标系下的换流器控制模型,分别设计了串、并联侧换流器的控制策略,实现输电线路中有功功率和无功功率的独立控制,同时,在微电网三相不平衡情况下,获得输电线路中的负序电压并进行补偿;并在MATLAB/Simulink中建立了仿真模型,对提出的补偿控制策略进行了仿真分析。仿真结果证明,所提出的补偿控制能有效地治理输电线路的三相不平衡,实现微电网PCC的三相电压平衡。Aiming at the problem of unbalanced three-phase voltage in the common connection point(PCC)of the micro-grid,this paper proposes a control strategy to control the unbalanced three-phase voltage of the micro-grid PCC by injecting the negative sequence voltage into the transmission line with unified power flow controller(UPFC).Firstly,the working principle of UPFC is analyzed.Secondly,the power decoupling control method is proposed,and the control model of UPFC in the positive and negative sequence synchronous rotating coordinate system is established.The control strategy of the series and parallel side converter is designed respectively to realize the independent control of the active power and reactive power in the transmission line.Meanwhile,the power transmission is obtained under the unbalanced three-phase condition.The negative sequence voltage in the line is compensated.Finally,a simulation model is established in MATLAB/Simulink,and the compensation control strategy is simulated and analyzed.The simulation results show that the proposed compensation control strategy can effectively control the three-phase imbalance of transmission lines and realize the three-phase voltage balance of PCC in micro-grid.

关 键 词：统一潮流控制器 公共连接点 三相不平衡电压 解耦控制 同步旋转坐标 

分 类 号：TM464[电气工程—电器]