Performance Evaluation of Butterworth, Chebyshev, and Elliptic filter for Harmonic Mitigation using P-Q based SAPF

The majority of industries use controllers; adjustable speed drives and more and more smart appliances are being used in residences. These types of equipment draw non-sinusoidal currents from the supply causing supply voltage to also become non-sinusoidal. This results in harmonic distortion. Harmonics affects the loads which cause it as well as the other loads connected to the same utility which affects their operation. The utilities should supply harmonic-free power to all the loads connected to them. Shunt Active Power Filters are now being widely used to reduce harmonic distortion. Shunt Active Power Filter based on P-Q theory is simulated in MATLAB / SIMULINK and its performance is checked for different low pass filters like Butterworth, Chebyshev II, and Elliptic. Also, controlled rectifier-based R L loads are used and the performance is checked for different firing angles of the controlled rectifier.