DC and AC Active Power filters for Distributed Photovoltaic Grid System

Decentralized and Distributed Generation of solar power is one of the fastest growing models of power generation across the world. Harmonics are generated because of the presence of non-linear and small industrial type loads connected to these sources. This work presents active DC and AC power filters to reduce the harmonics of the same. The design aspects, modelling and simulation of the filters have been performed. The entire system consisting of solar power generating array, DC loads, 3 phase inverter and the AC loads have been modelled to review the performance of the filter in the presence of the variable loads. The DC filter is an active filter that is controlled by a PI controller to stabilize the DC voltage. The AC filter is a three phase PWM rectifier based filter where the switching is controlled based on the generated current reference. A Matlab/Simulink simulation was carried out to analyze the performance of the same.