Design and Simulation of Three Phase Shunt Active Power Filter to Eliminate Harmonics of LED Lighting Loads

Non-linear loads are an important fraction of loads in most commercial buildings. Most of these non-linear loads are lighting loads. So a small negative change in their harmonic distortion levels may affect the other loads in the building and the loads that are connected to the same bus. Shunt active power filters inject harmonic current with the same amplitude and opposite phase of the load harmonic current to eliminate the harmonic current flowing into the source. Therefore harmonic and reactive power trouble is solved simultaneously. In this study a three phase shunt active power filter based on synchronous reference frame (SRF) theory is designed and tested with an approximate linear LED model in MATLAB. A three phase current controlled voltage source inverter (VSI) and DC link capacitor is used as an active power filter. Pulses to the inverter are generated by hysteresis band current control (HBCC) technique. The THDI with the shunt active power filter is measured 2.52% which is within the allowable harmonic limits.