采用比例谐振控制的三相4桥臂并网逆变器的研究  

Research of Three Phase Four Leg Grid Connected Inverter Adopted Proportion Resonance Control

作　　者：董钺[1] 芮春保 李钊[1] 刘江华[1] 邱晗[1] 

机构地区：[1]天津电气传动设计研究所有限公司,天津300180 [2]江苏辉伦太阳能科技有限公司,江苏南京210061

出　　处：《电气传动》2014年第4期42-45,共4页Electric Drive

摘　　要：对于并入380 V配电网、且带有本地负载的储能型三相光伏逆变器,首先保证三相4线负载供电,在某些情况下也可向电网输出功率,因而需要考虑负载不对称的问题。由于生活负载中单相负载较多,负载电流除正、负序分量外还有零序分量,因此采用4桥臂拓扑结构可以为零序电流提供可控回路。此外,对于并网逆变器的电流调节,除矢量控制外,还可以采用比例谐振控制,对正弦电流直接进行调节。对4桥臂逆变器并网电流的比例谐振控制方法进行分析,通过引入负载电流作为逆变器并网电流给定,可以在容量范围内跟踪不对称负载电流,最后经试验验证了该控制方法的有效性。Three phase photo voltaic inverter with energy storage,which is connected to 380 V distribution gridand carries local load at the same time,is required to keep power supply to 3-phase 4-line load at first,and feed powerto grid in special condition. Asymmetry of local load must be considered. Most of daily load is single phase load,theload current includes positive,negative and zero sequence components,so the topology of four-leg inverter is adopted,which can provide flexible route for zero sequence current. And then,besides vector control of inverter AC current,proportion-resonance control can be also adopted to regulate the sinusoidal current directly. Proportion-resonancecontrol method of grid current of four-leg inverter was analyzed. By way of introducing load current as the reference ofinverter current,inverter grid current can be controlled to track load current in the rate power extent. This controlmethod is validated by the experiment.

关 键 词：4桥臂逆变器 比例谐振 负载电流跟踪 

分 类 号：TM464[电气工程—电器]