基于FPGA改进型串联混合有源电力滤波器的研究

Study of improved series hybrid active power filter with FPGA

为了解决电力电子等非线性变流装置和大容量动态负载所带来的电网日益严重的谐波问题,本文分析了能有效抑制谐波的带基波电流旁路通道的串联混合有源电力滤波器的结构特点、工作原理及双dq变换控制方法,提出基于FPGA的脉宽调制PWM硬件实现方法,设计了混合有源电力滤波器数字控制电路结构。基于Modelsim的仿真实验验证了FPGA模块的可行性,同时对其补偿特性进行了MATLAB仿真研究,仿真结果表明在负载不平衡情况下该方法能很好地进行谐波补偿并很大程度地降低有源部分的容量。

To solve the worse harmonic wave problem in electric grid brought by power electric non-linear current transformation equipment and large capacity dynamic load, the structural characteristic, operational principle and the method of double dq transformation on the series hybrid active power filter with fundamental current bypass channel which can inhibit the wave in harmony effectively are analyzed The realization of PWM hardware is proposed and the configuration of digital controlled circuit of the series hybrid active power filter based on FPGA is designed The simulation based on model indicates that it is effective and the compensation characteristics are also analyzed based on MATLAB. The results show that the method can well compensate the harmonic wave and largely reduce the rating of the active filter.