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
When/Where
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.
Course Information
The Wind Energy Systems (WES) course has two modes of instruction: lectures and exercises. The lectures are given by Moritz Diehl. One biweekly timeslot is dedicated to an 'exercise session' that will be coordinated by Nick Harder (nick.harder@inatech.unifreiburg.de).
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 '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.
Lectures
Date  Title / Slides  Videos 
12.05.2020 
Chapter 1: Introduction Section 1.1: Introduction (Slides) Section 1.2: Energy content of the wind 

13.05.2020 
Section 1.3: Power density of blade area Section 1.4: Components of modern wind turbine 

19.05.2020 
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 

20.05.2020 
Section 2.3: Mechanics of wind (continuation) Section 2.4: Stable and unstable atmospheric stratification 
Lecture_4_1_Section_2_3_continuation

26.05.2020 
Section 2.5: Statistics of wind Section 2.6: Spectral properties of wind


27.05.2020 
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 
Lecture_6_1_Section_2_6_continuation

02.06.2020 
Section 3.2: Actuator disc model and the Betz' limit (continuation) Section 3.3: Wake rotation & rotor disc theory 

09.06.2020 
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) 
Lecture_10_1_Section_3_4_part4 
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 
30.06.2020 
Chapter 4: Mechanics & Dynamics of Wind Turbines Section 4.1: Steady loads in normal operation Section 4.2: Stress and strain 

01.07.2020 
Section 4.3: Static beam bending Section 4.4.1: Intro: springmassdamper system Section 4.4.2: Eigenmodes Section 4.4.3: Rayleighs method 
Lecture_14_2_Section_4_4_part1 
08.07.2020 
Section 4.4.4: Dynamic beam equation Section 4.4.5: Tower eigenmodes Section 4.4.5: Stiff & soft towers 

10.07.2020 
Hike to Rosskopf Wind Turbines at 2 PM. Additional info is in the Special Events section below 
(participation is optional) 
14.07.2020 
Section 4.5: Blade oscillation & centrifugal stiffening Chapter 5: Control of Wind Turbines Section 5.1: Sensors and Actuators in wind turbines 
Lecture_16_1_Section_4_5_part1 Lecture_16_2_Section_4_5_part2

15.07.2020 
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  
28.07.2020 
Section 5.5: Thrust jump at nominal wind speed Chapter 6: Alternative Concepts Section 6.1: Vertical axes wind turbines 

29.07.2020 
Section 6.1: Vertical axes wind turbines Section 6.2: Airborn Wind Turbines 
Exercises
Date  Title  Link 
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 
Special Events

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/walkrosskopfwindturbine
Resources
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
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