APF谐波检测中改进的锁相环鲁棒性研究

Research on Robustness of Improved PLL for Active Power Filter Harmonic Detection

有源电力滤波器(APF)是当前谐波与无功综合治理的主趋势。为提高其谐波补偿性能,提出一种具有较强鲁棒性的、基于窗功能的锁相系统。与非窗锁相环相比,它能更准确、快速地跟踪输入信号的频率,相位和幅值。此外,它在电网电压骤升、骤降,电网电压相位突变,及电压含谐波等不理想电网环境下,仍可准确地跟踪相位。结构简单、鲁棒性强。仿真及实验结果证明了所提方案的有效性和正确性。

Active power filter（APF） is currently the main trend of harmonic and reactive power integrated governance.In order to improve its harmonic compensation performance,it proposes a stronger robustness,based on window function phase lock system.Compared with the non-window phase locked loop,it can be more accurately and quickly track the frequency,phase and amplitude of the input signal.It is under the condition of grid voltage swell,sag,phase mutation,and voltage harmonics,which do not contain the ideal network environment,still have accurate phase tracking results.The structure is simple and the robustness is strong.The simulation and experimental results demonstrate the effectiveness and correctness of the proposed scheme.