基于T型三电平拓扑的新型电能质量补偿器  

Novel power quality compensator based on T-type three-level topology

作　　者：朱非白 江道灼[1] 梁一桥[1] ZHU Feibai;JIANG Daozhuo;LIANG Yiqiao(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学电气工程学院,浙江杭州310027

出　　处：《电力自动化设备》2020年第6期149-155,共7页Electric Power Automation Equipment

摘　　要：针对三相四线制配电系统,提出一种基于T型中点箝位型三电平逆变器技术的新型电能质量补偿器拓扑,并简要介绍了新型电能质量补偿器的工作原理。详细分析了新型电能质量补偿器逆变器直流侧电压波动的成因,以及采用传统三维空间矢量脉宽调制(3D-SVPWM)算法时系统侧出现不平衡电流和谐波分量的根本原因,并提出改进调制算法来解决该问题,即通过分别处理直流侧正、负极电压调制比,并按比例分配补偿时间进行中点平衡控制。在MATLAB/Simulink平台上的仿真结果表明,所提改进调制算法通过简单的控制策略,可同时实现无功补偿、谐波抑制及不平衡治理,且补偿效果良好。For three-phase four-wire distribution system,a novel power quality compensator topology based on TNPC(T-type Neutral Point Clamped)three-level inverter is proposed.The working principle of the new power quality compensator is introduced briefly.The cause of the DC-link voltage fluctuation of the inverter in the new power quality compensator and the fundamental reason of the unbalanced current and harmonic components caused by the traditional 3D-SVPWM(3-Dimensional Space Vector Pulse Width Modu⁃lation)scheme are analyzed in detail.Then an improved modulation scheme is proposed to solve the above problem by processing the positive and negative voltage modulation ratio respectively and distributing the compensation time in the neutral-point balancing control on proportion.The simulative results on MATLAB/Simulink platform show that the proposed improved control scheme can achieve reactive power compensation,harmonic suppression and load balancing simultaneously through simple control strategy,and the compensation effect is good.

关 键 词：T型中点箝位型三电平拓扑 逆变器 电能质量 3D-SVPWM 谐波分析 补偿 

分 类 号：TM464[电气工程—电器]