Power Quality Enhancement using Switched Capacitor Compensation

The electric utility industry and consumers of electrical energy are facing new challenges for cutting the electric energy cost, improving energy utilization, enhancing electric energy efficiency, improving supply waveform power quality, reducing safety hazards to personnel and protecting electronic sensitive computer and automatic data processing networks. The growing use of nonlinear type electric loads causes a real challenge to power quality for electric utilities. The deregulated electricity market where: competition, supply quality, security and reliability are now key issues for any economic survival. Electrical power network pollution is characterized by the nonlinear electric load ability to distortion modify and change the voltage and current waveform Root Mean Square (RMS) due to its inherent nonlinearity. In this paper we have implemented dual loop feedback control system to operate PWM. In this dual loop feedback control scheme minimum ripple current error (ei) and minimum ripple power error (ep) are generated which gives total error (et). Total error is reduced in SCC control scheme. Total error is given to (Proportional Integral Derivative) PID controller. PID controller output is limited by limiter block; it is used for reference of PWM waveform. I have selected PWM carrier frequency of 900Hz for simulation.