有源电力滤波器( Active Power Filter,APF) 补偿电流检测环节对其补偿性能有着重要的影响。三相电网电压不对称且畸变时,传统的p－q法和ip－iq法无法准确实现对负荷综合补偿。为此本文引入基于滑动平均滤波器-自适应陷波滤波器(MAF-ANF)的方法实现对非理想电网电压条件下网侧电压的处理,得到平衡无畸变的电网电压,并对负载电流处理,得到准确的基波电流正序分量。然后对传统p－q法进行改进,得到了基于MAF-ANF的谐波检测方法,该方法较传统方法谐波检测精度提高,取得了更好的补偿效果。最后通过Simulink仿真证明了在非理想电网电压条件下所提检测算法的正确性和有效性。
英文摘要:
The detection of compensation current has an important impact on the performance of active power filter.The traditional method of p－q and ip－iq can not be accurately achieve compensation of load with the unbalanced and distorted three-phase voltage. In this paper, the method of based on MAF-ANF is introduced which processes the distorted grid voltage in order to obtain an undistorted and balanced voltage. The load current is also processed to get the correct fundamental positive component. The traditional p-q method is improved, and the harmonic detection method based on MAF-ANF is deduced. This method improves the accuracy of harmonics detection and obtains better compensation effect. Finally, the correctness and effectiveness of the proposed detection algorithm under the condition of non ideal grid voltage are proved by simulation.