A thesis in the Electrical Engineering Department of the University of Technology discussed the doctoral degree for the student (Muhammad Omar Ali)

(Modeling, Simulation, Analysis, and Implementation of Fractional Order Regulated Electric Power Converters)

The aim of the thesis is that there are several methods of DC inverters to regulate the input voltage according to each application. DC inverters can be categorized into isolated DC inverters and non-isolated DC inverters. This work consists of two parts, where the first part deals with one of the types of isolated DC voltage inverters known as the single primary induction changer, as it can be considered as a voltage inverter to raise and lower the DC current, as this modulator is used to raise the DC voltage entering from a wide voltage range between (60) -90 volts to a controlled output voltage of 315 volts.

The thesis discussed the use of a DSPIC30F4011 controller to control the output voltage of the modulator by making a comparison of the voltage obtained from the modulator output as a reference signal with the voltage that is selected in the program written on the controller to keep the output voltage constant. .

The researcher came up with a model and analysis of the single primary inductance modulator (SEPIC) using MATLAB / SIMULINK and tested it to measure its efficiency. The highest efficiency obtained from a single primary induction inductor (SEPIC) is 83.42% which was achieved at an input voltage of 65V.

The second stage of this work deals with a new arrangement of the multi-level inverter (MLI) of two levels (seven and nine) which have been simulated by the Mathematical Laboratory MATLAB / SIMULINK. Where different types of adjustment methods were used such as phase disposal (PD), phase opposition (POD) decision opposition, alternative arrangement of opposition (APOD). The results obtained are compared with those of the standard for a Cascaded H-bridge multi-level inverter.

The two types of multi-level inverter have been implemented and tested in practice. As the practical results proved that the best harmonic distortion can be obtained from the multi-level inverter for both types of seven and nine levels, depending on the modulation technique, is 18.07% and 14.36%, respectively.

The discussion committee consisted of: Prof. Dr. Essam Mahmoud Abdel-Baqi / Chairman, and Prof. Dr. Jamil Kazem Abd / Member, and Prof. Rashid Hamid Matar / Member and Prof. Dr. Dhari Youssef Mahmoud and Prof. Abbas Hussein Issa / Member., Prof. Dr. Ali Hussein Ahmed / Supervisor and Member.