Advanced DC/AC Inverters

Applications in Renewable Energy

Fang Lin Luo, Hong Ye

• Publisher: CRC Press
• Year: 2017
• Print ISBN: 9781466511354
• eBook ISBN: 9781351832359
• Topic: Technology & Engineering
• Subtopic: Electrical Engineering & Telecommunications
• Index: Technology & Engineering

DC/AC inversion technology is of vital importance for industrial applications, including electrical vehicles and renewable energy systems, which require a large number of inverters. In recent years, inversion technology has developed rapidly, with new topologies improving the power factor and increasing power efficiency. Proposing many novel approaches, Advanced DC/AC Inverters: Applications in Renewable Energy describes advanced DC/AC inverters that can be used for renewable energy systems. The book introduces more than 100 topologies of advanced inverters originally developed by the authors, including more than 50 new circuits. It also discusses recently published cutting-edge topologies.

Novel PWM and Multilevel Inverters

The book first covers traditional pulse-width-modulation (PWM) inverters before moving on to new quasi-impedance source inverters and soft-switching PWM inverters. It then examines multilevel DC/AC inverters, which have overcome the drawbacks of PWM inverters and provide greater scope for industrial applications. The authors propose four novel multilevel inverters: laddered multilevel inverters, super-lift modulated inverters, switched-capacitor inverters, and switched-inductor inverters. With simple structures and fewer components, these inverters are well suited for renewable energy systems.

Get the Best Switching Angles for Any Multilevel Inverter

A key topic for multilevel inverters is the need to manage the switching angles to obtain the lowest total harmonic distortion (THD). The authors outline four methods for finding the best switching angles and use simulation waveforms to verify the design. The optimum switching angles for multilevel DC/AC inverters are also listed in tables for quick reference.

Application Examples of DC/AC Inverters in Renewable Energy Systems

Highlighting the importance of inverters in improving energy saving and power-supply quality, the final chapter of the book supplies design examples for applications in wind turbine and solar panel energy systems. Written by pioneers in advanced conversion and inversion technology, this book guides readers in designing more effective DC/AC inverters for use in renewable energy systems.

1

Introduction

DC/AC inverters convert DC source energy for AC users, and are a big category of power electronics. Power electronics is the technology to process and control the flow of electric energy by supplying voltages and currents in a form that is optimally suited for user loads [1]. A typical block diagram is shown in Figure 1.1 [2]. The input power can be AC and DC sources. A general example is that the AC input power is from the electric utility. The output power to load can be AC and DC voltages. The power processor in the block diagram is usually called a converter. Conversion technologies are used to construct converters. Therefore, there are four categories of converters [3]:

• AC/DC converters/rectifiers (AC to DC)

• DC/DC converters (DC to DC)

• DC/AC inverters/converters (DC to AC)

• AC/AC converters (AC to AC)

We will use converter as a generic term to refer to a single power conversion stage that may perform any of the functions listed above. To be more specific, in AC to DC and DC to AC conversion, rectifier refers to a converter when the average power flow is from the AC to the DC side. Inverter refers to the converter when the average power flow is from the DC to the AC side. In fact, the power flow through the c...

Table of contents

• Cover
• Half Title
• Title Page
• Copyright Page
• Table of Contents
• Preface
• Authors
• 1. Introduction
• 2. Pulse Width-Modulated DC/AC Inverters
• 3. Voltage Source Inverters
• 4. Current Source Inverters
• 5. Impedance Source Inverters
• 6. Quasi-Impedance Source Inverters
• 7. Soft-Switching DC/AC Inverters
• 8. Multilevel DC/AC Inverters
• 9. Trinary Hybrid Multilevel Inverter (THMI)
• 10. Laddered Multilevel DC/AC Inverters Used in Solar Panel Energy Systems
• 11. Super-Lift Converter Multilevel DC/AC Inverters Used in Solar Panel Energy Systems
• 12. Switched-Capacitor Multilevel DC/AC Inverters in Solar Panel Energy Systems
• 13. Switched Inductor Multilevel DC/AC Inverters Used in Solar Panel Energy Systems
• 14. Best Switching Angles to Obtain Lowest THD for Multilevel DC/AC Inverters
• 15. Design Examples for Wind Turbine and Solar Panel Energy Systems
• Index