Introducing the ICMPPSO algorithm to minimize phase voltage THD of 3-level inverter

The three level inverters have been employed in industrial application from the previous time for converting DC voltage to AC voltage. Existence of harmonics in output voltage is the main problem in these constructions. THD is a very important factor to determine losses in the equipment's such as induction motor, transformers and etc. Hence the exact determination is important. In prior literature, to determine the amount of THD, approximate methods have been used. They have considered some limited low order harmonics. In this paper, to determine the exact amount of phase voltage THD (PVTHD), an exact procedure based on extracting formula is presented. The proposed methods consider all harmonic orders and can be utilized for each number of switching angles. In this paper, the new algorithm will have been employed to minimize phase voltage THD. The optimization angles are calculated by Intelligent Coefficient Multi Population Particle Swarm Optimization (ICMPPSO) algorithm. Finally, to show the effectiveness of the proposed methods, approximate and exact methods are compared. Simulation and programming are done in MATLAB software.