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Linear optimal control of multi-functional grid-connected inverter
Author(s): CHENG Chong, ZENG Zheng, TANG Shengqing, YANG Huan, ZHAO Rongxiang
Pages: 135-
142,148
Year: 2016
Issue:
1
Journal: Electric Power Automation Equipment
Keyword: multi-functional grid-connected inverter; LCL filter; linear quadratic optimal control; feedforward control;
Abstract: 针对具有工频隔离变压器和LC滤波环节的三相复合功能并网逆变器,将其等效变换为带有LCL滤波器的逆变器结构.利用LCL滤波环节的状态方程建立小信号模型,提出了一种基于线性二次型理论的最优控制策略,在消除了LCL滤波器固有的谐振现象的同时,实现了对并网点PCC处谐波、无功和不平衡电流的补偿,提高了并网点处的电能质量.为了提高系统稳定性,给出了与线性最优控制相适应的前馈控制算法,并采用了无锁相环补偿电流和功率跟踪电流生成算法.利用电磁暂态综合分析程序PSCAD/EMTDC的仿真结果验证了所提方法的正确性和有效性.
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