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This paper presents a three-phase Shunt Active Power filter (SAPF) with PI control capacitor voltage regulation technique. In order to mitigate current harmonics in the source current Shunt Active Power filter is used. Quality power must be provided for safety, better operation of modern appliances and electric drives. In the modern world most of the automation works uses robots, drives which uses large number of switches. These loads in turn behave as nonlinear loads. These loads take nonsinusoidal currents introducing harmonics in the supply mains. Due to these nonlinear loads harmonics will be injected in the source current and it wont be pure sinusoidal anymore. Voltage source Inverter based Shunt Active Power filter is used for mitigation of harmonics and the DC link capacitor is used as energy source element connected across the Shunt Active Power Filter. Instantaneous Reactive Power theory(IRP) is used to control the operation of Shunt APF. By designing simulation block diagrams in the Matlab/Simulink the percentage of Total Harmonic Distortion(%THD) is calculated and found to be satisfactory.