Lifting wavelet transform based adaptive filter for active power filters

This paper presents a new harmonic measurement scheme on lifting wavelet transform based adaptive filter (LWTAF) for active power filters (APFs). As one of methods to build second-generation wavelets, lifting wavelet transform (LWT) can be easy to achieve in time domain for its original bit location calculation. LWT could lessen calculation complexity and depress course due to its particular structure, compared with first generation wavelet algorithm (WT). Then the performance of the LWTAF is studied and the harmonics detection working schematic of LWTAF is presented. LWTAF can abstract harmonic components effective and follow up the transient component more quickly than adaptive filter (AF). The simulation results validate the conclusion above.