新型三相不平衡负载逆变器及控制策略研究  

Research on new three-phase unbalanced load inverter and its control strategy

作　　者：李传军 李旭明 LI Chuan-jun;LI Xu-ming(Luoyang Railway Information Engineering School,Luoyang 471000,Henan Province,China)

机构地区：[1]洛阳铁路信息工程学校

出　　处：《信息技术》2019年第6期106-110,共5页Information Technology

摘　　要：文中提出了一种新型三桥臂逆变器以综合补偿低压配电系统不平衡负载。该型逆变器仅使用单个电容充当直流链,并通过中性点电容连接负荷中性点和逆变器直流链负端。该型补偿器避免了因电容电压均衡而增加的控制电路,并可有效节省开关器件。文中详述了新型补偿器运行机理和数学模型,提出了适用于三相不平衡负荷补偿的控制策略。最后通过PSCAD仿真模型,验证了所提拓扑和控制策略的可行性。This paper proposes a new three-leg inverter to comprehensively compensate for the unbalanced load of the low-voltage distribution system. The inverter only uses a single capacitor as a DC link and connects the load neutral point and the negative end of the inverter dc link through the neutral capacitor. This type of compensator avoids the control circuit that is added due to the voltage equalization of the capacitor. And can effectively save switching devices. In this paper,the operation mechanism and mathematical model of the new compensator are detailed,and the control strategy suitable for three-phase unbalanced load compensation is proposed. Finally,the feasibility of the proposed topology and control strategy is verified by the PSCAD simulation model.

关 键 词：不平衡负荷 逆变器 直流电容 

分 类 号：TM76[电气工程—电力系统及自动化]