基于PQR理论的三电平LCL滤波器优化设计

摘要

在并网逆变器中,LCL滤波器以其良好的滤波效果受到广泛应用.但其本身存在谐振问题,若滤波器的设计及控制策略不合适,会导致系统不稳定.根据PQR理论,分析p,q,r坐标变换及功率的定义,通过分析得出针对LCL滤波器的补偿控制算法.仿真和实验证明,该方案能有效提高并网逆变器输出电能质量.%The LCL filter is widely applied in the grid-connected inverter as preferable high frequency attenuation characteristic.The LCL filter will resonate if the design of the filter or the control method isn't suitable. Using PQR theory, the PQR transformation and the definition of the p, q, r coordinate are analyzed.This paper presents a compensation method to improve this issues, so that the performance of the designed LCL filter system can be improved.The effectiveness of the proposed algorithm is verified by simulation and experiment.