Preface

The purpose of this book is to integrate the technical knowledge obtained as a result of educational and research activities and to increase knowledge in the research area of electric power conversion. Electric power conversion systems are based on electromechanical conversion systems and static power converters.

In the first section, an incursion into the field of electric power conversion is presented.

Validation of the analytic mixed current-flux *d*-*q* mathematical model of a saturated, compensated, six-phase self-excited induction generator supplying a three-phase resistive or inductive load is shown in the second section. Both synchronous- and asynchronous-driven multiphase machines, with their main focus on multiphase power converter topologies associated with specific control, are presented.

Resonant power converters along with solutions to electromagnetic compatibility can be found in the third section. Power loss analysis based on experimental results of insulated-gate bipolar transistors in a high-voltage, high-power, dual-active bridge DC-DC converter for aerospace energy storage systems is presented. Both five-phase uncontrolled and controlled line commutated rectifiers are presented in a didactical manner.

In the fourth section, modern and efficient topologies and advanced control solutions to manage grid interactions of electric power conversion systems based on photovoltaic-delivered energy are envisaged. Moreover, two of the electric field applications are presented.

The applied methodology is based on knowledge developments and applicative research. Novice readers will learn how energy is converted adequately and adapted to different consumers. Advanced readers will discover different kinds of modern solutions and tendencies in the field of electric power conversion.

> **Professor Marian Găiceanu, PhD Habil. Eng.,**  Dunărea de Jos University of Galați, Galați, România

**1**

Section 1

Introduction

Section 1 Introduction

**3**

**Chapter 1**

*Marian Găiceanu*

**1. Chapter overview**

the end of this chapter.

Introductory Chapter: Electric

The introductory chapter has in view an incursion in discovering electricity, how can be handled, and the future of it. The chapter starts with the ancient discovery of electricity. Starting from the Kite experiment to the energy use of lightning is mentioned in the *New Discoveries in the Electricity* section. Moreover, the current path from the electrostatic machine to ion wind propulsion system is mentioned in the same section. A short history of energy conversion technology is described in the forthcoming section. Different electric power conversion technologies are mentioned. The possible pathways of the future electric power conversion are mentioned. Some ideas about electric power conversion development are mentioned at

Electricity is a natural phenomenon. One of the first known discovered natural electricity generations is the *electric fish* (discovered in twenty eighth century BC by the Egyptian). These types of fish are named *electrogenic* (one of the most dangerous fish is the *electric eel—electrophorus electricus*—due to the lethal electric shocks generation), being capable to generate the electric fields through electric organ discharge (EOD). Nowadays, the *bioelectrogenesis* (generation of the electricity by the living organisms) phenomenon is studied by the *electrophysiology* science branch. The receiver fish of the electric field is named *electroreceptive*, having the ability to

The Thales of Miletus (around 600 BC) remarked the attraction of lightweight material by rubbed amber (ἤλεκτρον in Greeks or ēlektron), discovering static electricity [2]. However, as the archeological discoveries are on-going the research-

In 1600 the scientist William Gilbert published the on the *Magnet treatise*, becoming the *Father of Electricity* [7]. In his published work *Pseudodoxia Epidemica* (1646), second book—*Tenets Concerning Mineral and Vegetable Bodies*, Thomas

Power Conversion

**2. The ancient discovery of the electricity**

**3. New discoveries in the electricity**

receive the electric field through the *electroreception* feature [1].

ers make hypothesis of electric light existence in ancient Egypt [3–6].

## **Chapter 1**
