Re-training course for Power Electronics

Course title in English

Re-training course for power electronics

ECTS credits

1.25

Assessment form

Quizzes

Teaching semester

autumn - spring

Course aims

To introduce the students to the essentials of electric drives. Main attention is on explaining construction and operating principles of electric drives used in the industry and infrastructures. To study energy exchange between power supply, electric drive and load machine as well as related electromechanical processes. To explain selection criteria of the drive based on the load and operating conditions with speed and torque control possibilities. To familiarize the students with the user interfaces of modern microprocessor-controlled drives.

Learning outcomes in the course

A student shall acquire:

- understanding of energy exchange processes in electric drives;

- knowledge of characteristics of different drive types;

- skills for selecting the drive according to the application;

- knowledge of the control possibilities of electric drives;

- knowledge of the sensors used in the drive systems;

- skills for choosing protective devices;

- skills for reading and composing connection diagrams;

- skills for for using different user interfaces.

Brief description of the course

Description and structure of an electric drive. A historical overview.

Energy flows in an electric drive. Power and control circuits. Relations to power and micro electronics. Drive mechanics: transmissions and basic movement equations. Translations of the moments of inertia, forces, torques and speeds. Load types and calculation examples. Standardized duty types. Motor power selection. Connection diagrams and schematic elements. DC drives characteristics and equations. Rheostat control of DC drives. DC drives with power converter. Pulse control of DC drives. AC asynchronous drives electromechanical characteristics. Starting of asynchronous drives. Soft starters. Asynchronous motor models. Principle of frequency control. Energy flows in frequency controlled drives. Use of frequency converters with different loads. Synchronous and servo drives. Basics of vector control. Stepper motor drives. Drives in electric transportation. Protection and control of electric drives. Sensors in electric drives. User interfaces. Electromagnetic compatibility in electrical drives.

Session-based study workload (in a semester):

64.0

lectures

32.0

practices

32.0

exercises

0.0

Content of lectures

1) Introduction to Power Electronics.

2) Components of The Power Electronics. The basic devices of the power electronics the real characteristics of the diode, thyristor, bip transistor.

3) Converter Design. Voltage inverters, rectifiers, filters.

4) DC/DC Converters. Buck converter. Boost converter. Two-quadrant controller. Four-quadrant controller.

5) AC/DC Converters. Basic topology, principle operation.

6) DC/AC Converters. Single-phase voltage impressing half-bridge and full-bridge inverter.

7) Control of Converters.

8) Loses in converters and thermal design.

9) Modulation methods.

10) Advanced converter topologies.