Course syllabus

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EEN140 EEN140 Electric drive systems for vehicles and vessels lp4 VT22 (7.5 hp)

Course is offered by the department of Electrical Engineering

Contact details

Name                                  Email

Examiner:        Stefan Lundberg                     stefan.lundberg@chalmers.se Contact info.

Lecturer:          Stefan Lundberg                     stefan.lundberg@chalmers.se             Contact info.

 

Tutorial assistant: Stefan Lundberg    stefan.lundberg@chalmers.se             Contact info.

                        Paul Imgart                       paul.imgart@chalmers.se                    Contact info.

 

Laboratory and Project assistants:

Hannes Hagmar                  hannes.hagmar@chalmers.se  Contact info.

Paul Imgart                         paul.imgart@chalmers.se                    Contact info.

Robert Karlsson                  robert.karlsson@chalmers.se   Contact info.

Sohrab Mohtat                   sohrab.mohtat@chalmers.se

Patrik Ollas                         ollas@chalmers.se

Course purpose

Electric drive systems are becoming more and more central in modern propulsion. As an engineer it is therefore important to know the fundamentals of this technology to design and develop propulsion systems. In this course students will learn about the operation of an electric drive system, how to calculate its output power, efficiency, energy loss and how the electric machine is controlled. The course also includes the 3-phase inverter, how DC is converted into AC, the losses in the inverter and how it is used in the drive system.

 

Schedule

TimeEdit

Course literature

Compendium “Control of Variable-Speed Drives”, Lennart Harnefors, 2002, available at Store.

 

Electric Motors and Drives : Fundamentals, Types and Applications

By: Austin Hughes; Bill Drury. Edition: Fifth edition. Kidlington : Newnes. 2019. eBook., Database: eBook Index

 

Go to the Chalmers library homepage for e-books https://www.lib.chalmers.se/en/search/ebrary/

Search for “Electric Motors and Drives : Fundamentals, Types and Applications”. In the search results, look for the fifth edition 2019, klick on the link and you can download the book.

 

Lecture notes and handouts will be available on Canvas.

Course design

The prerequisite for this course is the course EEN135 Electric machines for vehicles and vessels or equivalent. This means that the course is continuing to build on the theory covered in EEN135 and it will be assumed that the students have followed the course EEN135 or have equivalent knowledge.

The course starts with electric circuit theory for DC circuits and the transient behaviour of inductors and capacitances used in power electronic circuits. Based on this the 2 quadrant and 4 quadrant DC/DC converter for the DC machine is investigated together with the dynamic model of the DC machine. This will form the basis for the 3-phase inverter used in AC drives and the field-oriented control of 3-phase machines.

The 4 quadrant DC/DC converter is expanded to the 3-phase inverter and its waveforms are investigated. Based on this the PWM modulator is selected to generate the wanted output voltage. From the waveforms the losses in the inverter are calculated and a thermal model is used to investigate the overload capability of the inverter.

The 3-phase inverter is added together with the 3-phase machine, induction machine and the permanent magnet synchronous machine, to a drive system. Using coordinate transformations, the AC machines are transformed into something that resembles the DC-machine and for this the field-oriented control is implemented and investigated.

 

The course is divided into four parts A, B, C and D:

  • A: Basic electrical DC circuits: Voltage, Current, Resistance, Power, Energy, Ohm's law, KVL, KCL, Capacitance, Energy source
  • B: Power electronic inverter: Electric circuit diagram, Switches, PWM, Curve shapes, Efficiency, losses, Overload capacity
  • C: Field-oriented control: Current control (torque) and speed control of the synchronous and induction machine.
  • D: Laboratory work: Measure on stationary operation of a power electronic inverter that drives an induction machine. Simulate a field-oriented control of an induction and a synchronous machine and calculate the system's energy use and losses.

 

The practical lab, Lab 1, is a 4 hours lab with home assignments that should be solved before the lab starts. In this lab you will work in groups of 2 to 3 students.

For the two computer labs, Lab 2 and 3, you will be working in groups 2 students and each group can book up to 3 occasions of 30 minutes each with the supervisors. These occasions can be used for getting help and for getting approval of the computer labs.

As can be seen in the teaching plan below there are

28 lectures = 56 h

8 tutorials = 16 h

1 practical lab = 4 h

2 computer labs = 2x3x0.5 = 3 h

3 duggor = 8 h

TOTAL: 87 h

This leaves 113 h for own work time, which means that you need to work on your own outside scheduled hours.

 

Teaching plan:

Hannes Hagmar                      HH in the teaching plan          Contact info.

Paul Imgart                       PI in the teaching plan            Contact info.

Robert Karlsson                      RK in the teaching plan          Contact info.

Stefan Lundberg                     SL in the teaching plan           Contact info.

Sohrab Mohtat                                SM in the teaching plan

Patrik Ollas                 PO in the teaching plan

 

Study week, Date, Time

                           Description / Material

Pages, course compendium / assistant/teacher

1 (12) Tue 22/3 

08-10

Course introduction

DC electric circuits, resistances, inductances, and capacitors.

 

1 (12) Tue 22/3  10-12

Continuation of electric circuits with DC, steady state and transients.

 

1 (12) Wed 23/3  08-10

lithium-ion battery systems, the construction of the battery system and the electrical model.

 

1 (12) Fri 25/3  08-10

Continuation of the lithium-ion battery systems

 

1 (12) Fri 25/3  10-12

Tutorial 1

 

2 (13) Tue 29/3  08-10

Basic power electronic circuit, the 2 quadrant DC/DC, the switches used (diode, IGBT and MOSFET, the ideal switch)

 

2 (13) Tue 29/3  10-12

Steady-state for power electronics, waveforms, input/output relation, pulse width modulation (PWM)

 

2 (13) Wed 30/3  08-10

Continuation of the 2 quadrant DC/DC and the 4 quadrant DC/DC

 

2 (13) Fri 1/4  08-10

Continuation of the 4 quadrant DC/DC

 

2 (13) Fri 1/4  10-12

Tutorial 2

 

3 (14) Tue 5/4   08-12

The 3-phase inverter, construction, and operation

 

3 (14) Tue 5/4 

10-12

PWM for 3-phase inverters and waveforms

 

3 (14) Wed 6/4 

08-10

Continuation of the waveforms and the generated voltage

 

3 (14) Fri 8/4 

08-10

Dugga part A

 

3 (14) Fri 8/4 

10-12

Tutorial 3

 

4 (16) Wed 20/4 

08-10

Losses in power electronics

 

4 (16) Thu 21/4 

08-12

Lab 1, group 1. Stationary operation of a power electronic inverter that drives an induction machine

HH, RK

4 (16) Thu 21/4 

13-17

Lab 1, group 2. Stationary operation of a power electronic inverter that drives an induction machine

HH, RK

4 (16) Fri 22/4 

08-10

Thermal networks and thermal networks for power electronics

 

4 (16) Fri 22/4 

10-12

Tutorial 4

 

5 (17) Mon 25/4 

13-17

Lab 1, group 3. Stationary operation of a power electronic inverter that drives an induction machine

HH, RK

5 (17) Tue 26/4 

08-10

The average model of the 3-phase inverter

 

5 (17) Tue 26/4 

10-12

 

 

5 (17) Wed 27/4 

08-10

Scaling of the 3-phase inverter

 

5 (17) Fri 29/4 

08-10

Tutorial 5

 

5 (17) Fri 29/4 

10-12

Current controller for an RL-circuit.

 

6 (18) Tue 3/5 

08-10

The field-oriented control for a PMSM

 

6 (18) Tue 3/5 

10-12

The field-oriented control for a PMSM

 

6 (18) Wed 4/5 

08-10

Speed control and thermal networks for electric machines

 

6 (18) Fri 6/5 

08-10

Dugga part B

 

6 (18) Fri 6/5 

10-12

Tutorial 6

 

7 (19) Tue 10/5 

08-10

The field-oriented control for an IM

 

7 (19) Tue 10/5 

10-12

The field-oriented control for an IM

 

7 (19) Wed 11/5 

08-10

Current model flux observer for the IM

 

7 (19) Fri 13/5 

08-10

Digital control

 

7 (19) Fri 13/5 

10-12

Tutorial 7

 

8 (20) Tue 17/5 

8-10

Field weakening operation

 

8 (20) Tue 17/5 

10-12

Dimensioning of components in the drive system

 

8 (20) Wed 18/5 

08-10

Sensor less operation, voltage model

 

8 (20) Fri 20/5 

08-10

Sensor less operation, signal injection

 

8 (20) Fri 20/5 

10-12

Tutorial 8

 

9 (21) Tue 24/5 

8-10

Dugga part C

 

9 (21) Tue 24/5 

10-12

Dugga part C

 

 

 

 

Changes made since the last occasion

  • It is a new course, all things are new.

Learning objectives and syllabus

Learning objectives:

 

  1. Describe and model ideal components such as diodes, MOSFET, IGBT, capacitors, resistors, DC voltage sources and DC current sources.
  2. Apply Ohm's law, Kirchhoff's law, power law and energy calculation to simple DC circuits.
  3. Describe how lithium-ion battery systems can be constructed and how they can be modeled and calculate voltages and currents that occur in them.
  4. Explain the structure and operation of a 3-phase power electronic inverter and the principle of pulse width modulation.
  5. Perform calculations on 3-phase power electronic inverters and draw the time functions of voltages and currents
  6. Describe the impact of the power electronics on the electrical machine and the surroundings.
  7. Explain the structure and operation of a field-oriented control for a synchronous and induction machine.
  8. For a synchronous and induction machine, design a field-oriented control and speed control based on machine parameters and bandwidth requirements and implement it in a simulation environment and evaluate its performance.
  9. Implement thermal networks for electrical machines and power electronic components in a simulation environment and describe its impact on overload capacity. 

 

Link to the syllabus on Studieportalen.

Study plan

 

Examination form

The course examination will involve three intermediate tests and one laboratory work:

  1. Part A, 2 credits: Basic electrical DC circuits.
    • Assessment: Intermediate test (Dugga). Max. points on the test is 30 points.
  2. Part B, 2 credits: Power electronic inverter.
    • Assessment: Intermediate test (Dugga). Max. points on the test is 30 points.
  3. Part C, 2 credits: Field-oriented control.
    • Assessment: Intermediate test (Dugga). Max. points on the test is 30 points.
  4. Part D, 1.5 credits: Laboratory work.
    • The assessment takes place during the laboratory work.

 

The grading scale for the three intermediate tests is:

  • Grade 3 between 12 and 17.9 points
  • Grade 4 between 18-23.9 points
  • Grade 5 between 24-30 points

 

For the final grade it is required that all parts, A, B, C and D are passed and when it is fulfilled the final grade is based on the summation of the points from parts A, B and C according to:

  • Grade 3 between 45-59.9 of the total score from A + B + C
  • Grade 4 between 60-74.9 of the total score from A + B + C
  • Grade 5 between 75-90 of the total points from A + B + C

 

Only Chalmers Approved calculators are allowed at the exam, see https://student.portal.chalmers.se/en/chalmersstudies/Examinations/Pages/default.aspx

 

The formula paper is attached to the duggas, you are not allowed to bring your own.

Course summary:

Date Details Due