基于加权平均电流控制的并网逆变器的研究  

Research on grid-connected inverter based on weighted average current control

作　　者：柳鑫 祁承超[1] 贺根华 贾强 LIU Xin;QI Chengchao;HE Genhua;JIA Qiang(Air Force Early Warning Academy,Wuhan 430019, China)

机构地区：[1]空军预警学院,武汉430019

出　　处：《空军预警学院学报》2018年第6期461-465,共5页Journal of Air Force Early Warning Academy

摘　　要：针对传统LCL型并网逆变器存在谐振尖峰和传统加权平均电流控制的并网逆变器存在并网电流谐波含量大的问题,提出了一种以滤波电容电流为内环、加权平均电流为外环的改进型加权平均电流控制策略;然后以容量为3 k W的单相全桥并网逆变器为例进行了仿真,验证了该策略的可行性.仿真结果表明,与传统有源阻尼控制策略、传统加权平均电流控制策略相比,采用本文控制策略的并网逆变器能够以总谐波失真为1.38%、功率因数为0.998实现并网,更好地满足了并网要求.In order to solve the problem that traditional LCL-type grid-connected inverter has resonance spikes and the grid-connected inverter of traditional weighted average current control has large harmonic content of the grid-connected current,this paper proposes an improved weighted average current control strategy with filter capacitor current as the inner loop and weighted average current as the outer loop,and then takes as example the single-phase full-bridge grid-connected inverter with a capacity of 3 kW to verify the feasibility of the strategy by simulating.The simulation results show that compared with the traditional active damping control strategy and the traditional weighted average current control strategy,the grid-connected inverter adopting the proposed control strategy can realize the grid-connection with total harmonic distortion of 1.38%and power factor of 0.998,which better meets the requirements of grid-connection.

关 键 词：并网逆变器 加权平均电流控制 有源阻尼 LCL滤波器 

分 类 号：TM46[电气工程—电器]