New Hybrid Active Filter Topology With Variable Conductance For Reduced Harmonic Distortion

P Satya Sri, P Govinda Raju


Unintentional series and/or parallel resonances, due to the tuned passive filter and the line inductance, may result in severe harmonic distortion in the industrial power system. This project presents a hybrid active filter to suppress harmonic resonance and to reduce harmonic distortion. The proposed hybrid filter is operated as variable harmonic conductance according to the voltage total harmonic distortion; therefore, harmonic distortion can be reduced to an acceptable level in response to load change or parameter variation of the power system by using fuzzy controller.  Since the hybrid filter is composed of a seventh-tuned passive filter and an active filter in series connection, both dc voltage and kVA rating of the active filter are dramatically decreased compared with the pure shunt active filter. In real application, this feature is very attractive since the active power filter with fully power electronics is very expensive. A reasonable tradeoff between filtering performances and cost is to use the hybrid active filter. Total harmonic distortion is reduced by using fuzzy controller Further more, this project discusses filtering performances on line impedance, line resistance, voltage unbalance, and capacitive filters. The results verified through MATLAB/SIMULINK environment.



Tzung-Lin Lee, Member, IEEE, Yen-Ching Wang, Student Member, “Hybrid Active Filter With Variable Conductance for Harmonic Resonance Suppression in Industrial Power Systems” IEEE, Jian-Cheng Li, and Josep M. Guerrero, Senior Member, IEEE

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