A new single phase hybrid passive filter to dampen resonances and compensate harmonics and reactive power under distorted source conditions

This paper proposes a new single phase hybrid passive filter (SPHPF) for compensating load voltage and current harmonics, correct power factor, eliminate the chances of series and parallel resonance and eliminates large variation of power factor and terminal voltage with varying loads under stiff and distorted source conditions. The harmonics analysis is performed in order to observe the percentage reduction of total harmonic distortion for passive filter at various loads. The investigations are carried out to validate the performance of proposed SPHPF with detuned resonance, for effective and efficient operation under varying loads and source conditions. The topology of SPHPF is chosen to shift the resonance frequency of the resulting system below 80 Hz where no excitation is expected. The frequency response shows excellent damping characteristic for load harmonic current above 80 Hz, which indicates that the hybrid passive filtering performance of this topology is satisfactory. Experimental and simulation results show that the proposed passive filter can simultaneously compensate effectively all voltage and current harmonics and reactive power for large capacity nonlinear load.