Introduction to Modern Power Electronics

Andrzej M. Trzynadlowski

• Publisher: Wiley
• Year: 2015
• ISBN:
  9781119003236
• Edition: 3
• Topic: Technology & Engineering
• Subtopic: Power Resources
• Index: Technology & Engineering

Provides comprehensive coverage of the basic principles and methods of electric power conversion and the latest developments in the field This book constitutes a comprehensive overview of the modern power electronics. Various semiconductor power switches are described, complementary components and systems are presented, and power electronic converters that process power for a variety of applications are explained in detail. This third edition updates all chapters, including new concepts in modern power electronics. New to this edition is extended coverage of matrix converters, multilevel inverters, and applications of the Z-source in cascaded power converters. The book is accompanied by a website hosting an instructor's manual, a PowerPoint presentation, and a set of PSpice files for simulation of a variety of power electronic converters. Introduction to Modern Power Electronics, Third Edition:

• Discusses power conversion types: ac-to-dc, ac-to-ac, dc-to-dc, and dc-to-ac
• Reviews advanced control methods used in today's power electronic converters
• Includes an extensive body of examples, exercises, computer assignments, and simulations

Introduction to Modern Power Electronics, Third Edition is written for undergraduate and graduate engineering students interested in modern power electronics and renewable energy systems. The book can also serve as a reference tool for practicing electrical and industrial engineers.

1
Principles of Electric Power Conversion

In this introductory chapter, fundamentals of power electronics are outlined, including the scope, tools, and applications of this area of electrical engineering. The concept of generic power converter is introduced to illustrate the operating principles of power electronic converters and the types of power conversion performed. Components of voltage and current waveforms, and the related figures of merit, are defined. Two basic methods of magnitude control, that is, phase control and pulse width modulation (PWM), are presented. Calculation of current waveforms is explained. The single-phase diode rectifier is described as the simplest power electronic converter.

1.1 WHAT IS POWER ELECTRONICS?

Modern society with its conveniences strongly relies on the ubiquitous availability of electric energy. The electricity performs most of the physical labor, provides the heating and lighting, activates electrochemical processes, and facilitates information collecting, processing, storage, and exchange.

Power electronics can be defined as a branch of electrical engineering devoted to conversion and control of electric power, using electronic converters based on semiconductor power switches. The power grid delivers an ac voltage of fixed frequency and magnitude. Typically, homes, offices, stores, and other small facilities are supplied from single-phase, low-voltage power lines, while three-phase supply systems with various voltage levels are available in industrial plants and other large commercial enterprises. The 60-Hz (50-Hz in most other parts of the world) fixed-voltage electric power can be thought of as raw power, which for many applications must be conditioned. The power conditioning involves conversion, from ac to dc or vice-versa, and control of the magnitude and/or frequency of voltages and currents. Using the electric lighting as a simple example, an incandescent bulb can directly be supplied with the raw power. However, a fluorescent lamp requires electronic ballast that starts and stabilizes the electric arc. The ballast is thus a power conditioner, necessary for proper operation of the lamp. If used in a movie theater, the incandescent bulb mentioned before is supplied from an ac voltage controller that allows dimming of the light just before the movie begins. Again, this controller constitutes an example of power conditioner, or power converter.

Raw dc power is usually supplied from batteries and, increasingly, from photovoltaic sources and fuel cells. Photovoltaic energy systems are usually connected to the grid, and the necessary power conditioning involves dc-to-ac voltage conversion and ...