Course syllabus

Course-PM

ENM052 ENM052 Ancillary services in power system lp2 HT21 (7.5 hp)

Course is offered by the department of Electrical Engineering

Contact details

.

Course purpose

The main aim of this course is that students should develop and demonstrate their knowledge and capability to explain and analyse different aspects of ancillary services in power systems for delivering electricity in a stable way with high power quality. In particular, this course focuses on the frequency and voltage ancillary services. Simulation projects and laboratory tests will be conducted to facilitate the understanding of related theories. 

Schedule

TimeEdit

Course literature

The following book is the main textbook used throughout the course.

• Prabha Kundur, Power System Stability and Control, McGraw-Hill, 1993
• Hadi Saadat, Power System Analysis, 3^rd Edition, PSA Publishing, 2010

The textbooks are available at Cremona (www.chalmersstore.se) at the Student Union. The textbooks contain essential materials for the course. It should, however, not be viewed as the only source of information needed to prepare for the examination. Additional materials will be provided during lectures and/or be made available on the course homepage.

.

Course design

This course consists of scheduled lectures (18x2 hours), guest lecture (1x2 hours), tutorials (11x2 hours), project consultation (8x2 hours), and laboratory work (3x1 hour) during 8 study-weeks. Check the schedule in Time-Edit for updated time and location information.

1. Lectures: Contents treated in lectures can be found in the detailed course PM. Numerical examples will be given in the lectures to help clarify the theory wherever necessary.
2. Tutorials: Numerical exercises will be given during tutorial sessions and in your homework.
3. Project Work (compulsory): The computer-based project starts from the first week of the course and last for 8 weeks and is carried out in groups. Regular supervision by tutors will be provided once per week in a 2-hour session. Form a project group with your classmates and book your session at the course homepage. The detailed description of the project will be provided at the start of the project.
4. Frequency control laboratory (compulsory): This lab demonstrates how a hydro power plant (synchronous generator) is started up and synchronized to the main grid, and how it acts to provide generation and frequency ancillary service to the grid. Each group will need to go for one time only. Book your time on the course homepage.
5. Long transmission line laboratory (compulsory): This lab demonstrates how voltage varies at different loading conditions of a long ac transmission line.
6. Voltage control laboratory (compulsory): This lab demonstrates how a hydro power plant (synchronous generator) provides voltage control and reactive power support to the main grid through its excitation system.

.

Changes made since the last occasion

This course is given first time in SP2 in 2021, to replace the previous course ENM051 Power System Analysis and Control. The main differences are

• Course content re-organized to focus on first frequency ancillary service and then voltage ancillary service, 
• Mid-term exam removed,
• Computer simulation software uses Simcape Electrical Specialized Power System toolbox in Matlab/Simulink, instead of PSS/E,
• Simulation project will be approved onsite instead of report submission. 

Learning objectives and syllabus

Learning objectives:

Regarding knowledge and understanding,
1. Discuss the challenges and opportunities in power system operation and control when transitioning to renewable-based power system;
2. Explain what ancillary services are and why they are needed for a stable operation and control of power system;
3. Discuss and reflect on factors that affect grid frequency and the current practice to handle frequency variation; 
4. Explain the measure for frequency quality and stability, and the provider and system dimension of frequency ancillary services; 
5. Discuss and reflect on factors that affect grid voltage and the current practice to handle voltage variation at different voltage levels;
6. Explain the physical meaning of reactive power and the relation between power flow and grid voltage;
7. Explain characteristics of transmission lines and cables, and functions of different power transformers;

Regarding skills in calculations and modelling
8. Simulate a power system by using models of swing equation, generators and loads for analysing frequency variation phenomena; 

Link to the syllabus on Studieportalen.

Study plan

Examination form

The examination is based on the final exam. The participation in all the laboratory activities are compulsory and the simulation project needs to be approved onsite by the supervisors to pass the course. The final grade will be 5, 4, 3 and U (fail). For a total of 30 points, to get a 5, you need 24 points or above (80%), and to get a 4, you need 18 points or above (60%), and to get a 3, you need 12 points or above (40%). In summary, to pass the course, you need to pass

• Approved simulation projects
• Approved laboratory participation
• Final exam: Jan. 13, 2022, AM

Calculator: only Chalmers approved calculators can be used in examination: Casio FX-82, Texas TI-30, Sharp EL-W531. .