A New Three Phase Hybrid Passive Filter to Dampen Resonances and Compensate Harmonics and Reactive Power for Any Type of Load under Distorted Source Conditions

This paper proposes a new three phase hybrid passive filter (HPF) for compensating voltage and current harmonics type of load, and power factor. The proposed filter is not sensitive to source impedance variations, eliminate the chances of series and parallel resonance and eliminates large variation of power factor and terminal voltage caused by varying loads under stiff and distorted source conditions. Besides these, the topology also helps fast settling of transients and blocking of harmonics. The investigations are carried out to validate the performance of proposed HPF with detuned resonance, for effective and efficient operation under varying loads and source conditions. The topology of HPF 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, The simulation results show that the proposed passive filter can simultaneously compensate effectively all harmonics and reactive power for a variety of nonlinear loads.