**Digital Power Electronics and Applications by Fang Lin Luo, Hong Ye and Muhammad Rashid.**

Contents:

1. Introduction

2. Energy Factor (EF) and Sub-sequential Parameters

3. Basic Mathematics of Digital Control Systems

4. Mathematical Modeling of Digital Power Electronics

5. Digitally Controlled AC/DC Rectifiers

6. Digitally Controlled DC/AC Inverters

7. Digitally Controlled DC/DC Converters

8. Digitally Controlled AC/AC Converters

9. Open-loop Control for Digital Power Electronics

10. Closed-Loop Control for Digital Power Electronics

11. Energy Factor Application in AC and DC Motor Drives

12. Applications in Other Branches of Power Electronics

Preface: The purpose of this book is to provide a theory of Digital Power Electronics and its applications. It is well organized in 400 pages and over 300 diagrams. Traditionally, Power Electronics is analyzed by the analog control theory. For over a century, people have enjoyed analog control in Power Electronics, and good results in the analog control and its applications in Power Electronics mislead people into an incorrect conclusion that Power Electronics must be in analog control scheme. The mature control results allowed people to think that Power Electronics is a sunset knowledge. We would like to change these incorrect conclusions, and confer new life onto the traditional Power Electronics. In this book the authors initially introduce the digital control theory applied to Power Electronics, which is completely different from the traditional control scheme.

Power Electronics supplies electrical energy from its source to its users. It is of vital importance to all of industry as well as the general public – just as the air that we breathe and water that we drink are taken for granted, until they are no longer available, so it is with Power Electronics. Therefore, we have to carefully investigate Power Electronics. Energy conversion technique is the main focus of Power Electronics. DC and AC motor drive systems convert the electrical energy to mechanical energy and vice versa. The corresponding equipment that drives DC and AC motors can be divided into four groups:

• AC/DC rectifiers;

• DC/AC inverters;

• DC/DC converters;

• AC/AC (AC/DC/AC) converters.

All of the above equipment are called power supplies. They are switching circuits working in a discrete state. High-frequency switch-on and switch-off semiconductor devices allow switching circuits to have the advantage of high power rate and efficiency, low cost, small size and high power density. The size of a flat-transformer working in 250 kHz is much less than 1% of the volume of a normal transformer working in 50 Hz with the same power rating. Switching circuits perform in switching-on and switchingoff states periodically. The switching period, T, is the sampling interval (T = 1/f ), where f is the switching frequency. Switching circuits, including all converters, transfer energy from a source to the end-users in discontinuous manner; i.e. the energy is not continuously flowing from a source to load. The energy is pumped by energyquantization via certain energy-storage elements to load in a sampling interval In order to apply digital control theory to Power Electronics, the authors define new parameters such as the energy factor (EF), pumping energy (PE), stored energy (SE), time constant, τ, and damping time constant, τd. These parameters are totally different from the traditional parameters such as the power factor (PF), power transfer efficiency (η), ripple factor (RF) and total harmonic distortion (THD). Using the new parameters we successfully describe the characteristics of the converters’ systems.

Correspondingly, new mathematical modeling has been defined:

• A zero-order-hold (ZOH) is used to simulate all AC/DC rectifiers.

• A first-order-hold (FOH) is used to simulate all DC/AC inverters.

• A second-order-hold (SOH) is used to simulate all DC/DC converters.

• A first-order-hold (FOH) is used to simulate all AC/AC (AC/DC/AC) converters.

The authors had successfully applied the digital control theory in the AC/DC rectifiers in 1980s. The ZOH was discussed in digitally-controlled AC/DC current sources. Afterwards, the FOH was discussed in digitally-controlled DC/AC inverters andAC/AC converters. Finally, the SOH has been discussed in digitally-controlled DC/DC converters. The energy storage in power DC/DC converters have carefully been paid attention to and the system’s characteristics have been discussed, including the fundamental features: system stability, unit-step response and impulse-response for disturbance.

These research results are available not only for all types of the converters, but for other branches in Power Electronics as well. We describe the digital control scheme in all types of the converters in this book, and some applications in other branches such as power factor correction (PFC) and power system synchronous static compensation (STATCOM). Digital Power Electronics is a fresh theory and novel research method. We hope that our book attracts considerable attention from experts, engineers and university professors and students working in Power Electronics. This new control scheme could be described as fresh blood injected into the traditional Power Electronics field, and hopefully may generate new development. Therefore, this book is useful for both engineering students and research workers.

Fang Lin Luo

Hong Ye

Muhammad Rashid

Book Details:

⏩Authors: Fang Lin Luo, Hong Ye and Muhammad Rashid

⏩Copyright © 2005, Elsevier (USA)

⏩Language: English

⏩Pages: 421

⏩Size: 5.43 MB

⏩Format: PDF

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