Control Technologies in Wind Systems

Understanding of the appropriate modeling and control system design in order to achieve maximum power extraction, reactive power regulation and other control targets, for all the conventional wind power systems.

Objectives

Understanding of the appropriate modeling and control system design in order to achieve maximum power extraction, reactive power regulation and other control targets, for all the conventional wind power systems.

Prerequisites

None

Syllabus

In recent years, there exists an ever increasing requirement for greater contribution of renewable energy in order to meet the daily electricity needs. Wind is one of the renewable energy sources with the highest participation rates in order to achieve this goal. This course presents the basic types of wind power generators used in practice. The material included is the one in the corresponding semester course the Department of Electrical and Computer Engineering University of Patras and concerns in the design of the conventional control systems used in those wind power generators. The material included in this course is structured in six sections. The First Section provides the main characteristics of wind power generators and the basic types used or currently in use. The Second section presents the extracted mechanical power of the wind, the mechanical power regulation mechanisms and some basic information on the modeling of the mechanical parts of the wind turbine. The Third Section presents Park's transformation, the concept of the PLL and the basic models of electric machines developed in the synchronously rotating dq reference frame. The Fourth section includes the three-phase AC/DC power converter, its model in the synchronously rotating dq reference frame and the conventional control system with cascaded control loops. The Fifth Section presents a popular variable-speed wind power generator, namely the Doubly-Fed Induction Generator, and its cascaded control system. Finally, the Sixth Section presents the wind power generators using Squirrel-Cage Induction Generators and the Permanent Magnet Synchronous Generators, and the corresponding cascaded control systems.