A novel space vector pulse width modulation (SVPWM)‎ multilevel inverter with minimum total harmonic distortion (THD)‎ and minimum total losses

Other Title(s)

نوع جديد من مبدل متعدد المستويات يعمل بتقنية SVPWM مع أقل THD و أقل خسائر بالقدرة الكلية

Dissertant

Abd al-Abbas, Ali Kazim

Thesis advisor

Hairik, Haroutuon A.
Thijil, Rabi Hashim

Comitee Members

Ibrahim, Mustafa M.
Abbas, Abbas Hafiz
Mahmud, Jawad Radi
Marhun, Ali Fadil
al-Shaykhali, Ali K. M.

University

University of Basrah

Faculty

Engineering College

Department

Department of Electrical Engineering

University Country

Iraq

Degree

Ph.D.

Degree Date

2012

English Abstract

The interest in multilevel inverter for high performance applications has been growing in recent years due to their potential advantages over two-level inverters.

The general structure of the multilevel inverter is to synthesize staircase several levels of voltages, typically obtained from capacitor voltage sources.

The concept of three-phase three-level soft-switching inverter has been studied in the present thesis.

Theoretical background of the inverter is at first presented.

Also, three state of operation for the inverter is studied.

The inverter switches are triggered using SVPWM technique.

Detailed proposed SVPWM scheme to generate the desired output voltages are derived and simulated.

Testing of this inverter proves its ability to generate output voltages that contain small low order harmonics at different modulation indices.

The steady-state operation principle of the three-phase three-level voltage source inverter with two identical Auxiliary Active Resonant DC Link (ARDCL) snubbers connected to the high voltage DC bus line has been studied in the present thesis.

The auxiliary circuits are activated during the transition of main switches.

This soft-switching topology requires no much modification of SVPWM algorithm and gives less total power losses compared with hard switching inverter.

The operating modes are explained in details.

The main features are : simple, robustness, lower harmonic distortion of the output voltage and high efficiency.

A closed loop inverter voltage regulation system based on conventional PI, PI-like fuzzy and Artificial Neural Network (ANN) controllers are adopted in this work.

The parameters of these controllers are evaluated through using trial and error method.

ANN is used to control the ARDCL soft-switching inverter using by the back propagation learning method or (delta learning method).

The results of proposed controllers are compared at different reference voltages.

Simulation results show that good performance is achieved for the voltage regulation even with sudden change of load.

All these works are carried out using Matlab simulation facilities.

Main Subjects

Electronic engineering

Topics

• Electric power systems
• Electric power generation

No. of Pages

145

Table of Contents

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-317642