During the past decade, the installed wind power capacity in the world has been increasing more than 30%. Wind energy conversion system (WECSs) based on the doubly-fed induction generator (DFIG) dominated the wind power generations due to the outstanding advantages, including small converters rating around 30% of the generator rating, lower converter cost.
Due to the non-linearity of wind system, the DFIG power control presents a big challenge especially under wind-speed variation and parameter’s sensibility.
To overcome these major problems; an improved IDPC (Indirect Power Control); based on PID “Proportional-Integral-Derivative” controller, was proposed instead the conventional one (based on PI), in order to enhance the wind-system performances in terms; power error, tracking power and overshoot. Unfortunately using robustness tests (based on severe DFIG’s parameters changement); the wind-system offers non-satisfactory simulation results which were illustrated by the very bad power tracking and very big overshoot (> 50%).
In this context; adaptive, robust & intelligent controllers were proposed to control direct & quadrature currents (Ird & Irq) under MPPT (Maximum Power Point Tracking) strategy to main the unity power factor (PF≈1) by keeping the reactive power at zero level. In this case, the new IDPC based on intelligent controllers offered an excellent wind-system performance especially using robustness tests, which offered a big improvement especially using Type-1 Fuzzy Logic Controller (T1-FLC), Type-2 Fuzzy Logic Control (T2-FLC; is the New class of fuzzy logic) & Neuro-Fuzzy Logic (NFC).
In this sense, I think that this edited book is an important contribution to help students already in mastery of the basis of power electronic circuits and control systems theory to achieve these pedagogical goals. The proposed book describes with easy manner the modeling & control of Wind-turbine DFIG in order to control the stator powers using different topologies of robust, adaptive and intelligent controllers.
The book present numerous intelligent control techniques that help in the control design of the DFIG wind-system (WT).
The textbook “Improved Indirect Power Control (IDPC) of Wind Energy Conversion Systems (WECS)” proposes a collection of concepts, organized in a synergic manner such that to ease comprehension of the WT control design.
The book’s contribution goes towards completing the already existing literature by offering a useful integration of control techniques, worthy to be read, understood and employed in the various WT applications.
Please enjoy reading this book.
Dr. Ali CHEBABHI
ICEPS (Intelligent Control & Electrical Power Systems),
Sidi-Bel-Abbes Mohamed El Bachir El Ibrahimi University, BBA,
How to Use This Book
This book offers advanced Power Control such as: Indirect Power Control (IDPC) to overcome wind-system DFIG limitation performances under different wind speed and parameters changement conditions.
This book is addressed to students of: License, Master degrees and also for Post-graduation (PhD students) in order to understand the wind-system basics especially: Power electronics control (in this proposed Book we used SVM in order to fix the switching frequency), Power-flow DFIM diagram & Maximum power point tracking strategy.
CONSENT FOR PUBLICATION
CONFLICT OF INTEREST
The authors declare no conflict of interest, financial or otherwise.
Firstly, I would like to thank Allah, for His mercy on me during all my life, and praise Prophet MOHAMMAD (Peace be upon him!). I would like to express my appreciation to all those who gave me the possibility to complete this book. I wish to express my best gratitude and thanks to my Co-Editor, Pr Azeddine CHAIBA, for his technical guidance, his intellectual support and encouragement of my research work.
LAS Research Laboratory Department of Electrical Engineering
University of Setif-1, Setif
Department of industrial Engineering
University of Khenchela
List of Contributors