tailieunhanh - WIND TURBINES_2

The area of wind energy is a rapidly evolving field and an intensive research and development has taken place in the last few years. Therefore, this book aims to provide an up-to-date comprehensive overview of the current status in the field to the research community. The research works presented in this book are divided into three main groups. | Part 2 Wind Turbine Controls 11 Control System Design Yoonsu Nam Department of Mechanical Engineering Kangwon National University 192-1 Hyoja-2 dong Chunchon Kangwon 200-701 Korea 1. Introduction A wind turbine control system is a complex and critical element in a wind turbine. It is responsible for the autonomous reliable and safe operation of the machine in all wind conditions. Two levels of control operations are required. One is supervisory control and the other is dynamic feedback control of blade pitch and generator torque for maximizing power production and minimizing mechanical loads on the wind turbine. The supervisory control system is one operating system of the wind turbine and has the following functions operational state stand-by start-up power production shutdown transition control control of subsystems cooling heating hydraulics etc. diagnostics alarm management data logging statistics post-processing user access management visualization. A supervisory controller monitors the turbine and wind condition in order to decide when to start and shut down the wind turbine. Fig. 1 shows a schematic of the operational state transition logic which is implemented in supervisory control. A wind turbine operator can start and shut down turbine operation through a SCADA supervisory control and data acquisition system as shown in Fig. 1. The SCADA system can communicate with the supervisory controller in order to control and monitor the wind turbine. The main topic of this chapter is the design of a control algorithm for the dynamic feedback controller which manages the blade pitch the generator torque and the yaw system. Most multi-MW wind turbines are equipped with variable speed and variable pitch VSVP technology Leitheadb Connor 2000 Bianchi et al. 2007 Muller et al. 2002 Boukhezzar et al. 2007 . In the below rated wind speed conditions the rotor speed varies with wind speed while the pitch is fixed in order to maximize the energy capture from the wind. .

• Năng lượng
• Turbine Structures
• Turbine Industry
• Plant Leaves
• Efficient Generation
• Turbine Technology
• Turbine Simulators
• Wind turbine
• Statistical modeling
• Quantitative evaluation
• Variable speed electronics
• Yaw drive
• Advanced Aircraft
• One Dimensional
• Morphing Structures
• Assessment Evaluation
• Aircraft Engine
• Turbine Engines