Simulation of Shunt Active Power Filter to Enhance Power Quality

Because of the nonlinear load and power electronics equipments fast switching, many problems are created in power system network. These power electronics equipments are very sensitive and costly so power quality issues are becoming stronger. So equipment will continue polluting the system more and more because of cost increase caused by the built-in compensation at now an age efficiency and cost are considered at same level. For overcome these types of problems and to improve the power quality active power filter are introduced and developed over the years. Among which shunt active power filter is used to eliminate load current harmonics and reactive power compensation. In this dissertation, three-phase shunt active power filter used to compensate harmonics and reactive power by nonlinear load to improve power quality is implemented for three-phase three wire systems. The advantage of this system is that it is based on linguistic description and does not require a mathematical model of the system. The process of compensation is depend on sensing line currents only, and an approach different from conventional methods, which require sensing of harmonics or reactive power components of the load. The main principal of MATLAB program to simulate the system operation and simulation results are presented under steady state conditions. These simulation results obtained shows the performance of better results. The Pulse Width Modulation (PWM) pattern generation is based on carrier less hysteresis based current control to obtain the switching signals to the voltage sourced PWM converter type.