Lectures: Prof. Dr. Moritz Diehl, Exercises: Nick Harder
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.
Contents:
 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
Course Organization
The course is organized as flipped classroom. We provide recordings of the lectures and will meet once every week for either a Q&A or an exercise session. The detailed time plan for the semester can be found below. We highly recommend to follow the suggesed schedule for the lectures.
Virtual meetings: We will meet every Tuesday, 12:30 PM to 2:00 PM, in a virtual lecture room. These meetings are alternatingly dedicated to either Q&A sessions with Prof. Diehl or exercise sessions with the teaching assistant (see below). We will use Zoom for the meetings. Please note that you can join the meeting via your browser and do not need to install to the Zoom client.
You can join via this link.
Meeting ID: 629 0189 7053
Password: efjnDNpG3
None of the meetings will be recorded. For more information on how the university uses Zoom, a guide for students, and a note on data protection please see here.
You can also join the WONDER.ME room for meeting with your fellow students before and after the lectures here.
Lecture recordings: The lecture recordings were already created in a past semester.
Course manuscript: The lectures are accompanied by a detailed course manuscript, which you may find here.
Q&A sessions: Every second week there will be a virtual Q&A session with Prof. Diehl, where you can ask any questions about the course content. The format is meant to be highly interactive and depends strongly on your participation. We would recommend that while watching the video lectures or reading the course script, you write down any questions that come to your mind, such that you have them readily available for the Q&A sessions.
Forum: In Ilias, we provide a forum for discussion of any questions you have related to the course, be it organization, content or exercises. Please feel free to open new topics and to answer questions of your fellow students. Link to the forum
Exercises: The exercises are voluntary (though of course we strongly recommend to solve them). Nonetheless we offer the possibility to hand them in to receive feedback, but for this please respect the deadlines you can find in the calendar below. If you would like feedback on a specific part of the exercise especially, you can state so on your solution sheet. To hand them in, send them in an email to: nick.harder@inatech.unifreiburg.de.
Final evaluation: The final exam is a written exam. This final exam is 'closedbook,' 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 multiplechoice and partially shortanswer. The final exam is on 21.09.2021 from 4PM to 6 PM.
Schedule
When 
Content 
Recordings 
20.04.2021 12:30 PM 
Introduction session   
19.04  23.05.2021 
Chapter 1: Introduction Section 1.1: Introduction (Slides) Section 1.2: Energy content of the wind Section 1.3: Power density of blade area 

27.04.2021 12:30 PM 
Q&A session 

26.04  30.04.2021 
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
Exercise Sheet 1 

04.05.2021 12:30 PM 
Q&A session 

03.05  07.05.2021 
Section 2.4: Stable and unstable atmospheric stratification Section 2.5: Statistics of wind Section 2.6: Spectral properties of wind 

11.05.2021 12:30 PM 
Exercise session on exercise sheet 1 
Exercise_1_Solution 
10.05  14.05.2021 
Chapter 3: Aerodynamics of Wind Turbines
Section 3.1: Wakes (Wind_wakes_image) Section 3.2: Actuator disc model and the Betz' limit
Exercise Sheet 2 

18.05.2021 12:30 PM 
Q&A session 

17.05  20.05.2021 
Section 3.3: Wake rotation & rotor disc theory Section 3.4: Blade element momentum (BEM) theory 

01.06.2021 12:30 PM 
Exercise session on exercise sheet 2 
Exercise_2_Solution 
31.05  04.06.2021 
Section 3.4: Blade element momentum (BEM) theory
Exercise Sheet 3 

08.06.2021 12:30 PM 
Q&A session 

11.06.2021 12:00 PM 
Hike to wind turbines on Rosskopf (details) 

07.06  11.06.2021  Section 3.4: Blade element momentum (BEM) theory  
15.06.2021 12:30 PM 
Guest Lecture by Prof. Dr. Jens Geisler Topic: Industrial Practice of Wind Energy Converter Control 

14.06  18.06.2021 
Chapter 4: Mechanics & Dynamics of Wind Turbines Section 4.1: Steady loads in normal operation Section 4.2: Stress and strain
Exercise Sheet 4 

22.06.2021 12:30 PM 
Exercise session on exercise sheet 3 

21.06  25.06.2021 
Section 4.3: Static beam bending Section 4.4.1: Intro: springmassdamper 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 4.4.6: Stiff & soft towers 

29.06.2021 12:30 PM 
Q&A session 

28.06  02.07.2021 
Section 4.5: Blade oscillation & centrifugal stiffening
Chapter 5: Control of Wind Turbines Section 5.1: Sensors and Actuators in wind turbines 

06.07.2021 12:30 PM 
Exercise session on exercise sheet 4 

05.07  09.07.2021 
Section 5.2: Control system architecture Section 5.3: Control of variable speed turbines 

13.07.2021 12:30 PM 
Exercise session on mock exam 
Mock Exam 
12.07  16.07.2021 
Section 5.4: Torque control at subrated power
Section 5.5: Thrust jump at nominal wind speed 

20.07.2021 12:30 PM 
Q&A session 

19.07  23.07.2021 
Chapter 6: Alternative Concepts Section 6.1: Vertical axes wind turbines Section 6.2: Airborn Wind Turbines 

21.09.2021 4PM  6PM 
Final Exam 
Special Events

The tour to the wind turbines on Rosskopf will take place on June 11 afternoon. All information can be found here.
Resources
Wind Energy Handbook is available here.
Wind Energy Explained: Theory, Design and Application is available here.
Links of interest
20200512 Report on renewable power generation costs in 2018 (by IRENA) (PDF)
20200519 Which way a wind turbine turns might not seem to matter (by the Economist) (screenshot)
20200519 Atmospheric circulation patterns (from wikipedia)
20200526 Article on the Global Energy Transition (by the Economist)
20200602 Albert Betz: WindEnergie. Cover, Turbine Illustrations, Concluding Sentence