Wind Energy Systems

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 time-slot is dedicated to an 'exercise session' that will be coordinated by Nick Harder (nick.harder@inatech.uni-freiburg.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 '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.


Lectures

Date Title /  Slides Videos
12.05.2020

Chapter 1: Introduction

Section 1.1: Introduction (Slides)

Section 1.2: Energy content of the wind

 

Lecture_1_1_Section_1_1

Lecture_1_2_Section_1_2

13.05.2020

Section 1.3: Power density of blade area

Section 1.4: Components of modern wind turbine

Lecture_2_1_Section_1_3

Lecture_2_2_Section_1_4

Lecture_2_3_Q&A

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

Lecture_3_1_Section_1_5

 

Lecture_3_2_Section_2_1&2

 

Lecture_3_3_Section_2_3

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

Lecture_4_2_Section_2_4

 

26.05.2020

Section 2.5: Statistics of wind

Section 2.6: Spectral properties of wind

 

Lecture_5_1_Section_2_5

Lecture_5_2_Section_2_6

Lecture_5_3_Weather_data

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

 

Lecture_6_2_Section_3_1

Lecture_6_3_Section_3_2

02.06.2020    
09.06.2020    
10.06.2020    
16.06.2020    
23.06.2020    
24.06.2020    
30.06.2020    
07.07.2020    
08.07.2020    
14.07.2020    
21.07.2020    
22.07.2020    
28.07.2020    
29.07.2020    

 


Exercises

Date Title Link
20.05.2020 Exercise Sheet 1* Exercise_Sheet_1
27.05.2020 Solution to Exercise Sheet 1 Exercise_Sheet_1_Solution
03.06.2020 Q&A session + Exercise Sheet 2 online classroom
10.06.2020 Solution to Exercise Sheet 2  
17.06.2020 Q&A session + Exercise Sheet 3 online classroom
24.06.2020 Solution to Exercise Sheet 3  
01.07.2020 Q&A session + Exercise Sheet 4 online classroom
08.07.2020 Solution to Exercise Sheet 4  
15.07.2020 Q&A session + Exercise Sheet 5 online classroom
22.07.2020 Solution to Exercise Sheet 5  

*some parts of the exercise sheet 1 have not been covered in the lecture yet. These topics will be covered on upcoming week.

 


Special Events

  • Invited Talk on Industrial Practice of Wind Energy Converter Control. Tuesday, June 23, 2020, 12:30. For more information, follow this link.

 


Resources

The lectures script can be found here

This course was also held in SS2018, all the materials from that course are available here.

 

Links of interest

2020-05-12 Report on renewable power generation costs in 2018 (by IRENA(PDF)

2020-05-19 Which way a wind turbine turns might not seem to matter (by the Economist(screenshot)

2020-05-19 Atmospheric circulation patterns (from wikipedia)

2020-05-26 Article on the Global Energy Transition (by the Economist)