Implementation of Nearest Vector Control and Nearest Level Control for Three Phase, Five Level CHB MLI with WAVECT Controller

Today, multilevel converters are considered the most advanced power conversion devices for high-quality applications. Because of the redundancy and modular structure, cascaded h-bridge multilevel inverters have been used in various industrial applications. Depending on the application and the multilevel inverter, many different modulation algorithms have been created or changed. Each one has its own pros and cons. In this paper, the modulation techniques Nearest Vector Control (NVC) and Nearest Level Control (NLC) have been implemented for three phase five level cascade H-bridge multilevel inverter in simulation with the help of MATLAB/Simulink. The NVC and NLC are compared with their total harmonic distortion factor in the output voltage. Using the WAVECT controller in an experimental setup, the results of the simulations are tested. NLC provides a better total harmonic distortion factor and fundamental peak value as compared with NVC.