A Selective Harmonic Elimination PWM Inverter Feeding Dynamic Loads

The output voltage of the square wave inverters is rich of harmonics. These harmonics have negative effects on the source and the load. To overcome their negative effect, many researches have worked on eliminating and/or reducing the harmonic content in the inverter output voltage. In this book, Selective Harmonic Elimination (SHE) pulse width modulation (PWM) technique is used to produce a predefined switching pattern at the inverter output voltage. This pattern is determined by solving a set of nonlinear equations using Genetic algorithm optimization technique in order to eliminate specific lower-order harmonics. The performance of single-phase SHE-PWM inverter with unipolar and bipolar switching patterns has been investigated. To further improve the quality of the load voltage and obtain a nearly perfect sinusoidal voltage, a second-order low-pass filter is employed at the inverter output. The performance of an open-loop, single-phase inverter with a second-order low-pass filter and feeding a dynamic and static loads is investigated through both simulation and experimental results.