LCL并网逆变器新型电流双闭环控制策略研究  

New current double closed loop control strategy of LCL grid-connected inverter

作　　者：黄挚雄[1] 徐保友[1] 沈玲菲[1] 李志勇[1] 

机构地区：[1]中南大学信息科学与工程学院,湖南长沙410075

出　　处：《电力系统保护与控制》2012年第17期1-5,共5页Power System Protection and Control

摘　　要：提出了一种新型的LCL型并网逆变器电流双闭环控制策略。内环采用电容电流反馈增加LCL并网逆变器系统阻尼,以抑制LCL输出滤波器带来的高频谐振问题;外环采用重复PR复合控制策略实现对并网电流的高性能控制,以抑制电网电压波动和非线性负载对并网电流的影响,实现对基频信号的无静差控制和高功率因数并网。在此理论分析的基础上研究了控制系统的稳定性,提出LCL并网逆变器电流双闭环控制器优化设计方案。最后通过仿真验证了理论分析的正确性和控制策略的可行性。A new current double closed-loop control strategy of LCL-type grid-connected inverter is proposed. The inner-loop uses capacitor current feedback to increase the system damping, to suppress high frequency resonance problems caused by LCL filter; the outer-loop adopts repeat-PR complex control strategy to control grid current, to inhibit the effect of voltage fluctuations and non-linear load on the grid currents and achieve non-static error control of fundamental signal and high power factor network synchronization. Based on this analysis, the stability of the control system is studied, and inverter dual-loop controller is adopted to optimize the design. Finally, the simulation verifies the correctness of theoretical analysis and the feasibility of control strategy.

关 键 词：并网逆变器 LCL滤波器 高频谐振 电容电流反馈 重复PR控制 

分 类 号：TM464[电气工程—电器]