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This Paper discusses the Simul and closed loop systems of a three phase con its study in terms of variation of load. The re the source inductance, firing angle and com important as these entities directly affect t Distortion (THD) of the power system and graphical method to develop a relationsh inductance, firing angle and commutation also discusses some trade-offs of using a Pro (PI) controller in the design of closed loop sy circuit and the effects of using active fil Harmonic Components of the source curre commutation failure in the three phase circuit.