Power system harmonic mitigation using hybrid filters

Due to the rapid developments in power electronic devices, harmonic level in distribution networks has significantly increased during the last two decades. This calls for effective harmonic mitigation techniques to maintain the power quality of electricity grids. This paper introduces various designs for hybrid filters and proposes an optimal design based on the simulation results which show that in order to obtain balanced and pure sinusoidal waveforms, the shunt active filter is the best candidate. Simulation results also show that when series component in a hybrid filter is connected to the load side, it results in undesirable distorted signal.