Improved Indirect Power Control (IDPC) of Wind Energy Conversion Systems (WECS)

Fayssal Amrane, Azeddine Chaiba

• Publisher: Bentham Science Publishers
• Year: 2019
• ISBN:
  9789811412677
• Topic: Technology & Engineering
• Subtopic: Renewable Power Resources
• Index: Technology & Engineering

Wind power capacity in the world has been increased by more than 30% over the last decade in countries which have prominent installations. Wind energy conversion systems (WECSs) based on the doubly-fed induction generator (DFIG) have dominated the wind power generation sector due to the outstanding advantages they provide, including small converter ratings (around 30% of the generator rating) and lower converter costs. Due to the non-linearity of wind power systems, the DFIG power control setup presents a big challenge especially under conditions of high variance in wind-speed and parameter sensing. To overcome these major problems, an improved IDPC (Indirect Power Control) system based on PID (Proportional-Integral-Derivative) controller, has been proposed instead of the conventional power inverters. This handbook covers information about IDPC based WECS. The book starts with a general introduction to wind power system basics. Subsequent chapters provide additional knowledge about robustness tests and adaptive / intelligent control systems employed in wind energy systems. The new concept of direct and quadrature current control (Ird & Irq) under MPPT (Maximum Power Point Tracking) strategy is also explained along with novel fuzzy logic type control systems. The authors have included detailed diagrams and an appendix of WECS parameters, making this handbook a useful primer for engineering students working towards completing licenses, Masters degrees and Post-graduation programs in advanced wind power energy systems.

Indirect Power Control (IDPC) of DFIG Using Classical & Adaptive Controllers Under MPPT Strategy

Fayssal Amrane, Chaiba Azeddine

Abstract

In this chapter, we present a comparative study of conventional Indirect Power Control (IDPC) algorithm of DFIG-Wind turbine in grid-connection mode, using PI and PID controllers via Maximum power point tracking (MPPT) strategy. Firstly, the conventional IDPC based on PI controllers will be described using simplified model of DFIG through stator flux orientation and wind-turbine model. The MPPT strategy is developed using Matlab/Simulink^® with two wind speed profiles in order to ensure the robustness of wind-system by maintaining the Power coefficient (Cp) at maximum value and reactive power at zero level; regardless unexpectedF wind speed variation. Secondly, the rotor side converter (RSC) and Grid side converter (GSC) are illustrated and developed using Space vector modulation (SVM) in order to minimize the stress and the harmonics and to have a fixed switching frequency. In this context, the switching frequency generated by IDPC to control the six IGBTs of the inverter (RSC), and this control algorithm works under both Sub- and Super-synchronous operation modes and depending to the wind speed profiles. The quadrants operation modes of the DFIG are described in details using real DFIG to show the power flow under both modes (motor and generator in the four (04) quadrants. Finally, the conventional IDPC have several drawbacks as: response time, power error and overshoot. In this context, the PID and MRAC (adaptive regulator) controllers are proposed instead of the PI to improve the wind-system performances via MPPT strategy with/without robustness tests. The obtained simulation results under Matlab/Simulink^® show high performances (in terms of power error, power tracking and response time) in steady and transient states despite sudden wind speed variation, whereas big power error and remarkable overshoot are noted using robustness tests, so the proposed IDPC can not offer big improvement under parameter variation.

Keywords: Indirect Power Control (IDPC) algorithm, Maximum power point tracking (MPPT) strategy, Model Reference Adaptive Control (MRAC), Space vector modulation (SVM).

1. INTRODUCTION

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. Several novel control strategies have been investigated in order to improve the DFIG operation performance [1^-4].

Nowadays, since DFIG-based WECSs (Fig. 3.1) are mainly installed in remote and rural areas [2]. In literature [5] vector control is the most popular method used in the DFIG-based wind turbines (WTs). In most applications, the proportional-integral (PI) controller based Direct Power Vector Control (DPC) scheme is used to control DFIG in wind energy conversion systems [6, 7]. Although this control scheme is easy...

Table of contents

• Welcome
• Table of Contents
• Title
• BENTHAM SCIENCE PUBLISHERS LTD.
• FOREWORD
• PREFACE
• List of Contributors
• General Introduction
• Overview of Wind Energy Conversion Systems (WECS)
• Indirect Power Control (IDPC) of DFIG Using Classical & Adaptive Controllers Under MPPT Strategy
• A Novel IDPC using Suitable Controllers (Robust and Intelligent Controllers)
• General Conclusion
• List Of Abbreviations
• APPENDIX A: WECS PARAMETERS
• LIST OF ABBREVIATIONS
• List of Acronyms
• List Of Acronymes