Inter-harmonic Resonance Suppression with Hybrid Parallel Power Filters

摘要

Inter-harmonics currents cause parallelresonance between line impedance and passive falter, whichputs the hybrid parallel power filter operating in dangerouscondition. A novel feed-forward control method is proposedto suppress the resonance by detecting resonant frequencycurrent in load current. The feed-forward control coefficientis independent with resonant frequency, which simplifies thecurrent detection. Both simulation and experiments verifiedthe proposed method.