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Design and Simulation of a Shunt Active Power Filter for grid tied PV generators for low voltage distribution network

Photovoltaic (PV) generated power to the grid through an inverter reduces the power quality in the grid, additional harmonics resulting from switching of electronic devices that makes up the inverter are injected into the grid. To reduce this harmonic and its effects, a Shunt Active Power Filter (SAPF) was designed and simulated using MATLAB Simulink. The line currents are measured and used to calculate reference current values using the Park's Transformation. The reference current is added with the compensating (error) current at the Hysteresis Current Controller and outputs a dc switching pulse (Pulse Width Modulator) that controls the inverter switching. The simulation results that were obtained shows the measured current, the compensation current produced by the filter, and the resultant line current. A pulse width modulation graph is also included in the results to show the switching control of the inverter. The total harmonic distortion in the line current was found to be 23.68%.