Abstract
Multilevel converters are becoming increasingly used in many industrial applications due to the many advantages that they offer. The improvements in the output signal quality, lower Total Harmonic Distortion (THD) and many other properties make multilevel converters very attractive for connecting photovoltaic generators to medium voltage grid directly or to be used in a local power supply. In this paper, we focus on the implementation of a three-phase five-level diode clamped inverter and design of a performing nonlinear controller using the Backstepping approach. The control objective is to generate, at the system output, sinusoidal three-phase voltages with amplitude and frequency fixed by the reference signal independently of load variations. The performance study of the multilevel inverter and the designed controller are made by simulations in Matlab/Simulink environment.
Highlights
IntroductionStatic power converters have become widely used in numerous applications
In the last years, static power converters have become widely used in numerous applications
A multilevel power converter structure has been introduced as an alternative in high power and medium voltage situations, due to their many advantages such as low power dissipation on power switches, low distortion of the output voltage, low harmonic contents and low electromagnetic interference outputs
Summary
Static power converters have become widely used in numerous applications. The selected switching technique to control the inverter will have an effective role on harmonic elimination while generating the ideal output voltage. These, so-called multilevel structures, can generate several voltage levels at the output of the converter. We are interested in implementing threephase five-level voltage inverter topology controlled by a nonlinear regulator using performing nonlinear control technique. The inverter must be able to generate pure sinusoidal voltage with amplitude and frequency fixed by reference. This multilevel inverter can be used for produce purely sinusoidal voltages from photovoltaic generators These can be used in a local power supply or be connected to the distribution network. The performance of this controller and the three-phase fivelevel inverter are tested, simulated and presented in the last section with comments and conclusions
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