The aim of this lecture course (6 ECTS) is that students understand the physical principles of wind energy and the technology of modern wind energy systems. It consists of lectures and exercises, and is given by Prof. Dr. Moritz Diehl and Nick Harder.
- global wind energy resource
- aerodynamic principles of wind turbines
- design of modern wind turbines
- control of modern wind turbines
- the electrical system of wind turbines
- alternative concepts and airborne wind energy
Due to Corona regulations the lectures and the exercises will take place online (at least until the mid of June) using Zoom Platform.
The first lecture will be held on 12.05.2020 (Tuesday).
The course will be held on:
- Tuesdays 12:30 - 14:00h
- Wednesdays 12:15 - 14:00h
Please, use the following link to access the class for both lectures and exercise sessions. Password: 5BCxhi3Xm
The lectures will be recorded and posted on this webpage.
The Wind Energy Systems (WES) course has two modes of instruction: lectures and exercises. The lectures are given by Moritz Diehl. One biweekly time-slot is dedicated to an 'exercise session' that will be coordinated by Nick Harder (firstname.lastname@example.org).
The exercise sessions are held on a biweekly basis. First exercise sheet will be provided on 20.05 after the lecture. One week after you receive the exercise sheet a video recording of the exercise solution will be posted on this webpage, and another week later an online exercise session will take place, where you can ask questions to the previous exercise sheet and a new exercise sheet will be provided. The exact schedule can be found below.
The grade for the course corresponds to the grade of the final exam. This final exam is 'closed-book,' which means that ONLY pens, a calculator, and one A4 page (that is, two sides) of notes can be used. The questions will be partially multiple-choice and partially short-answer.
|Date||Title / Slides||Videos|
Chapter 1: Introduction
Section 1.1: Introduction (Slides)
Section 1.2: Energy content of the wind
Section 1.3: Power density of blade area
Section 1.4: Components of modern wind turbine
Section 1.5: Blade & Airfoil nomenclature
Chapter 2: The Wind Resourse
Section 2.1: Origins
Section 2.2: Global patterns
Section 2.3: Mechanics of wind
Section 2.3: Mechanics of wind (continuation)
Section 2.4: Stable and unstable atmospheric stratification
Section 2.5: Statistics of wind
Section 2.6: Spectral properties of wind
Section 2.6: Spectral properties of wind (continuation)
Chapter 3: Aerodynamics of Wind Turbines
Section 3.1: Wakes (Wind_wakes_image)
Section 3.2: Actuator disc model and the Betz' limit
Section 3.2: Actuator disc model and the Betz' limit (continuation)
Section 3.3: Wake rotation & rotor disc theory
Section 3.3: Wake rotation & rotor disc theory (continuation)
Section 3.4: Blade element momentum (BEM) theory
|10.06.2020||Section 3.4: Blade element momentum (BEM) theory (continuation) (screenshot at end of lecture)|
|16.06.2020||Section 3.4: Blade element momentum (BEM) theory (continuation)|
|23.06.2020||Invited Talk on Industrial Practice of Wind Energy Converter Control. Additional info|
|24.06.2020||Invited Talk on Industrial Practice of Wind Energy Converter Control. Additional info||Lecture_12_Invited_talk_Part2|
Chapter 4: Mechanics & Dynamics of Wind Turbines
Section 4.1: Steady loads in normal operation
Section 4.2: Stress and strain
Section 4.3: Static beam bending
Section 4.4.1: Intro: spring-mass-damper system
Section 4.4.2: Eigenmodes
Section 4.4.3: Rayleighs method
Section 4.4.4: Dynamic beam equation
Section 4.4.5: Tower eigenmodes
Section 4.4.5: Stiff & soft towers
Hike to Rosskopf Wind Turbines at 2 PM. Additional info is in the Special Events section below
|(participation is optional)|
Section 4.5: Blade oscillation & centrifugal stiffening
Chapter 5: Control of Wind Turbines
Section 5.1: Sensors and Actuators in wind turbines
Section 5.2: Control system architecture
Section 5.3: Control of variable speed turbines
|21.07.2020||Section 5.4: Torque control at subrated power|
Section 5.5: Thrust jump at nominal wind speed
Chapter 6: Alternative Concepts
Section 6.1: Vertical axes wind turbines
Section 6.1: Vertical axes wind turbines
Section 6.2: Airborn Wind Turbines
|20.05.2020||Exercise Sheet 1||Exercise_Sheet_1|
|27.05.2020||Solution to Exercise Sheet 1|
|03.06.2020||Q&A session + Exercise Sheet 2|
|10.06.2020||Solution to Exercise Sheet 2||Exercise_Sheet_2_Solution|
|17.06.2020||Q&A session + Exercise Sheet 3||Execise_3|
|24.06.2020||Solution to Exercise Sheet 3||Exercise_3_Solution|
|08.07.2020||Q&A session + Exercise Sheet 4|
|15.07.2020||Solution to Exercise Sheet 4||Exercise_4_Solution|
|22.07.2020||Q&A session + Exercise 5||online classroom|
Invited Talk on Industrial Practice of Wind Energy Converter Control. Tuesday, June 23, 2020, 12:30. For more information, follow this link.
The tour to the wind turbines on Rosskopf will take place on July 10 afternoon. All information can be found on https://www.syscop.de/event/walk-rosskopf-wind-turbine
Wind Energy Handbook is available here
Wind Energy Explained: Theory, Design and Application is available here
!!! The updated lectures script can be found here !!!
!!! The mock exam can be found here !!!
This course was also held in SS2018, all the materials from that course are available here.
Links of interest
2020-05-19 Atmospheric circulation patterns (from wikipedia)