Simple PWM Approach for Three Phase Voltage Source Inverter with Reduced Complexity

PWM techniques are becoming popular in the present day applications due to the control of amplitude and frequency in the output voltage from VSI. There are two popular approaches for the implementation of PWM Algorithms. Carrier based and Space Vector Approach. Both the approaches give the same performance, but due to simplicity, mostly carrier based approach has been preferred. A large variety of PWM algorithms have been developed based on the scalar approach. Based on the modulating waveforms, the PWM algorithms mainly classified as continuous PWM (CPWM) and discontinuous PWM (DPWM) and active zero state PWM (AZSPWM) and near state PWM (NSPWM) algorithms. In the CPWM algorithms, the sinusoidal PWM (SPWM) and space vector PWM (SVPWM) algorithms are popular. A simple scalar pulse width modulation (PWM) approach that unites the conventional PWM methods and most recently developed reduced common mode voltage PWM method under one umbrella will be developed. It becomes an easy task to program the pulse patterns of various high performance PWM methods and benefit from their performance in modern three phase voltage source inverters for applications such as motor drives, PWM rectifiers and active filters. To validate the proposed algorithms, numerical simulation studies have to be developed by using Matlab-simulink.