A 15 level cascaded multilevel inverter with confined switches using grey wolf optimization forbgreen energy applications

Abstract

Multilevel inverters play a major role in medium voltage, high power and renewable applications. It is also used in certain applications where high switching frequency, high output voltage gain is required. The switching transient period of a MOSFET should be minimum because high dv/dt rate could result in permanent damage to the MOSFET. The harmonics present could cause many problems and so it has to be minimized. The harmonic content in the output voltage and the electromagnetic interference can be reduced with the help of small filters. It uses high switching frequency pulse width modulation for switching as it leads to high efficiency, fast response , with small and low cost filter. There are classical and optimization techniques for harmonic reduction. Compared to the classical method, advanced optimization techniques are vital in determining the switching angles, switching positions and harmonic reduction because of its simplicity. There exist a few optimization techniques for harmonic reduction in multilevel inverter which includes Firefly algorithm, Genetic algorithm, Firefly Assisted Genetic Algorithm, Grey Wolf Optimization algorithm. newline newline newline newline newline newline newline