Authors : Mustafa Fawzi Mohammed, Ali Husain Ahmad and Abdulrahim Thiab Humod
Abstract: In multi-level inverters design, the number of DC sources and switching devices are the key factors for designing of this kind of inverters. This study presents a new design of a seven levels inverter by using of single DC source with three series connected capacitors that are in parallel with the DC source. Only 8 IGBT switching devices are required for the design. A new method of modulation is presented to get the logic expression that makes the required pulses to drive the IGBT switches of the proposed inverter with a prior assumption that the frequency of each carrier is the same as the frequency of the reference or modulating signal to get the logic expression for each switching device. Later, the frequency of the carriers can be increased to a desired level for a proper performance of the inverter. In the proposed research, the fundamental frequency is 50 Hz and the carriers frequency is 3 kHz. The proposed inverter is simulated successfully by using MATLAB Simulink where low total harmonic distortion was achieved for its output voltage and current.
Mustafa Fawzi Mohammed, Ali Husain Ahmad and Abdulrahim Thiab Humod, 2018. Design and Simulation of a New Seven Levels Inverter for Renewable Energy Sources. Journal of Engineering and Applied Sciences, 13: 6866-6872.