Power quality is the regulation and stability in power in terms of current, voltage and frequency so as to keep these parameters under defined limits of use to satisfy the demand of electrical utility. Harmonic is one of the power quality problems which are because of distortions in sinusoidal supply voltage at the fundamental frequency. Harmonics cause significant effects at all levels of electrical utility i.e. domestic loads, commercial and industrial loads and control devices. These effects can be minimized with harmonic mitigation techniques. In this regard, shunt passive filter provides reliable, economic and cost effective solution when used with three phase converters. Moreover, six pulse converter circuit is used in conjunction with shunt passive filter which eliminates 3rd harmonics and reduces 5th and 7th harmonics as dominant harmonic levels. This work focuses on harmonic mitigation of three phase six pulse converter circuits by using shunt passive filters. In this context, hardware model is designed and its results are analyzed by using PQA (Power Quality Analyzer).