摘要
A novel FPGA-based grid frequency-adaptive controller for active power filters (APFs) is presented. The design incorporates two key techniques: a Modulated Sliding Discrete Fourier Transform (mSDFT) and a Variable Sampling Period Technique (VSPT). The mSDFT offers low computational cost for harmonic estimation due to its recursive nature, eliminating the dependence on sliding window length. The VSPT addresses grid frequency variability by dynamically adjusting the sampling period, further reducing computational burden and improving numerical accuracy. Validation through Controller Hardware-in-the-Loop (CHIL) demonstrates the effectiveness and superior performance of the proposed FPGA-based controller in practical APF applications.