Abstract
In this paper, a twelve-band hysteresis control is applied to a recent thirteen-level asymmetrical inverter topology by employing a robust proportional-integral (PI) controller whose parameters are decided online by genetic algorithm (GA). The asymmetrical inverter topology can generate thirteen levels of output voltage incorporating only ten switches and exhibits boosting capability. A 12-band hysteresis current control strategy is applied to ensure the satisfactory operation of the inverter. It is designed to provide a sinusoidal line current at the unity power factor. The tuning of the PI controller is achieved by a nature inspired GA. Comparative analysis of the results obtained after application of the GA and the conventional Ziegler–Nichols method is also performed. The efficacy of the proposed control on WE topology is substantiated in the MATLAB Simulink environment and was further validated through experimental/real-time implementation using DSC TMS320F28379D and Typhoon HIL real-time emulator (Typhoon-HIL-402).
Highlights
Voltage source inverters (VSI) produce a sinusoidal voltage of desired phase and magnitude using pulse width modulation (PWM) techniques
These results are obtained at h = 0.03 and the PI constants value is found by the genetic algorithm (GA) based controller
A twelve-band hysteresis control technique for the proposed thirteen-level WE inverter topology is presented in this paper
Summary
Voltage source inverters (VSI) produce a sinusoidal voltage of desired phase and magnitude using PWM techniques. Multilevel voltage source inverters (MLIs) have emerged as feasible solutions to improve the performance of renewable energy systems (RES), grid integration, electric vehicles, uninterruptible power supplies (UPS) and other state of the art power electronics utilities [1,2]. These converters can generate output voltages of the better harmonic spectrum and reduced THD levels through appropriate switching [3]. With the increase in the output voltage levels count, a number of the flying capacitors in FC-MLI, the number of the clamping diodes in NPC-MLI and the number of isolated DC sources in CHB-MLI increases considerably. FC and NPC converters require additional circuit and sophisticated algorithms to maintain the voltage balance across the capacitors
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