POWER QUALITY IMPROVEMENT USING THREE PHASE SERIES ACTIVE POWER FILTER

Electrical Engineering

Commercial buildings include the office buildings of IT companies, educational institutions, apartments, airports, etc. The typical loads in these commercial buildings comprise of many single- phase and three phase loads which includes non-linear loads like electronic and magnetic ballasts, switched mode power supplies (SMPS), air-conditioning systems, lifts, pumps, server, IT equipment, printers, small and large UPS, refrigerators, photocopier machines, office automation accessories, fire- Fighting systems. These loads are highly sensitive for any input variations in voltage. The performance of the electrical equipment gets worsened if they are supplied with polluted or distorted voltage. A number of solutions are available in the present day practice like power factor correction system with detuned filter, capacitor banks and series reactors to mitigate harmonics, improve power factor, avoid electrical resonance. Practically passive filters are still used though they have fixed compensation and the threat of resonance. Solutions to these problems can be of two ways- one is to change the design of the systems so that the problem gets reduced and the other is to find a remedy for the existing system. The different loads are classified according to the problems raised by them and to highlight the various practical solutions that can solve them to a great extent. This paper focuses on modeling and analysis of Custom Power Device (SAPF). MATLAB/Simulink based models for Series Active Power filter (SAPF) is presented. Among various PWM techniques, hysteresis band voltage control PWM is popularly used because of its simplicity of implementation. This known technique does not need any information about system parameters. The SAPF is simulated for different voltage variations at input generated by the three phase programmable source and the results are presented

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