Author : Abhay N. Mudiraj and V.P. Dhote

One of the major load on power system is domestic type and it consists of devices which are made up of semiconductors like computers, mobile chargers, TV and automatic devices. The excessive use of power electronic based residential loads has resulted in significant harmonic distortion in voltage and current in single phase distribution systems. Harmonics developed due to this has very bad impact on power system. This paper deals with Active power filter shunt type for single phase distribution network to control harmonics generated also it improves power factor of the system. The developed active filter consists of a MOSFET inverter and simple controller using analog circuit for cost reduction. Current is injected at point of common coupling to obtain an input current in sinusoidal waveforms. The validity of the proposed model is confirmed by simulation in mat lab results. The input current total harmonic distortion of around 3% obtained and circuit tested for various loads. The developed active filter can offer reduction in power loss and improve power quality.

Keywords: Active power filter, PI controller, Hysteresis controller, source voltage detection, harmonic distortion, voltage source inverter.

Article published in International Journal of Current Engineering and Technology, Vol.5, No.1 (Feb-2015)