alternative energy systems design and analysis with induction generators second edition pdf

For the first edition of our book, we never expected so much support and success for a subject dealing with induction machines since rotary machines are the subject of extensive coverage in the technical literature. We thoughtthat even for modern power generation applications, inclusion of the
induction generator would not justify so much interest from designers, and scientific and academic communities. But for our pleasure, we soon felt the particular point of view of its application as induction generator over those machines makes all the difference.

From the moment we started gathering material for the first edition, we realized that there were many interesting aspects that were rarely, if at all, dealt with in books and magazines. This fact made the job challenging. Special new aspects, such as the modern use of the wound rotor induction generator and the diversified applications of the induction generator, made us rethink the whole matter and we hope our readers will appreciate the new trends we are proposing in this second edition.

In revising the book, we noticed that some parts of the text could be shortened and other parts could be explained in better detail. Clarity and precision of all the explanations were points of thorough revision; particularly those related to examples, figures, problems, and the development of
the concepts. Some incoherence found in the previous edition—such as in drawings, citations, and figures — was removed. In addition, this revisedtext includes the suggestions of readers, professionals, and students.

This new edition is organized in 14 chapters. Chapter 1 presents some definitions, characteristics of primary sources, and industrial, commercial, residential, remote sites, and rural loads with highlights for selecting a suitable electric generator. Chapter 2 presents the steady-state modeling of the induction generator, with classical steady state representation, parameter measurements, and peculiarities of the interconnection to the distribution grid.

Chapter 3 expounds on transient modeling of induction generators, with a novel numerical representation of state space modeling that permits generalization of association of generators in parallel—an important subject for wind farms. Chapter 4 introduces in detail the performance of self-excited induction generators, voltage regulation, and the mathematical description of self-excitation.

Chapter 5 presents some general characteristics of the induction generator with respect to torque versus speed, power versus output current, and the relationship between air–gap voltage and magnetizing current. Chapter 6 discusses the construction features of induction machines, particularly for generator sizing, design and manufacturing aspects.

Chapter 7 presents power electronic devices; requirements for injection of power into the grid; interfacing with renewable energy systems; and AC–DC, DC–DC, DC–AC, and AC–AC conversion topologies as they apply to the control of induction machines used for motoring and generation purposes. Chapter 8 describes the fundamental principles of scalar control of induction motors/ generators and how the control of magnitude of voltage and frequency achieves suitable torque and speed with impressed slip. 

Chapter 9 presents vector control techniques in order to calculate the stator current components
for decoupling of torque and flux for fast-transient closed-loop response. Chapter 10 presents contemporary optimization techniques for peak power tracking control of induction generators and emphasizes hill-climbing and fuzzy controls. Chapter 11 covers the doubly-fed induction generator (DFIG) as applicable to high power renewable energy systems with important pumped-hydro, stand-alone, and grid-tied applications, including theoretical and practical coverage of DFIG systems as applied to high power renewable energy systems.

Chapter 12 describes simulation approaches for transient response of self-excited induction generators in several environments, steady-state analysis and vector-controlled–based induction motoring/generating systems. Chapter 13, new to the second edition, deals with the most usual applications of the induction generator in alternative sources of energy based on the variable speed features of the induction generator, which enables the control of a wide set of variables including frequency, speed, output power, slip factor, voltage tolerance, and reactive power. Chapter 14 discusses economic, social, and impact issues related to alternative sources of energy with appraisal and considerations of investments for the decision maker.

Four appendices close this second edition. Appendix A makes a brief introduction to fuzzy logic, which is regarded as the top reference for control and automation of energy systems with induction generators including domestic, automotive, and power generation appliances. Appendix B gives
a full statement set of a C program to represent the self-excited induction generator. Similarly, in Appendix C, the reader will find a full Pascal statement program for simulation of self-excited induction generators. Finally, Appendix D includes modern techniques of power tracking curve based
algorithm for wind energy systems. This is the most usual concept for a variable-speed optimized control for induction generators.