A NEW CONTROL TECHNIQUE FOR SUPPRESSING HARMONICS AND NEUTRAL-LINE CURRENT BY USING HYBRID POWER CONDITIONER IN 3 - ɸ FOUR-WIRE DISTRIBUTION POWER SYSTEMS TO OVERCOME CONVENTIONAL METHODS

SIRIGIREDDY SIVAREDDY, P. SANDEEP KUMAR

Abstract


In this paper, a new hybrid power conditioner is proposed for suppressing harmonic currents and neutral-line current in three-phase four-wire distribution power systems. The proposed hybrid power conditioner is composed of a neutral-line current attenuator and a hybrid power filter. The hybrid power filter, configured by a three-phase power converter and a three-phase tuned power filter, is utilized to filter the nonzero-sequence harmonic currents in the three-phase four-wire distribution power system. The three-phase power converter is connected to the inductors of the three-phase tuned power filter in parallel, and its power rating can thus be reduced effectively. The tuned frequency of the three-phase tuned power filter is set at the fifth harmonic frequency. The neutral- line current suppressor is connected between the power capacitors of the three-phase tuned power filter and the neutral line to suppress the neutral-line current in the three-phase four-wire distribution power system. With the major fundamental voltage of the utility dropping across the power capacitors of the three-phase tuned power filter, the power rating of the neutral-line current suppressor can thus be reduced. Hence, the proposed hybrid power conditioner can effectively reduce the power rating of passive and active elements. Simulation results show that the proposed hybrid power conditioner achieves expected performance.


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