Applied Power Electronics

Aim

After completing the course the students should be able to:

PART 1:

• Perform calculations on symmetric and on simple non symmetric three phase systems and do simple calculations with symmetric components
• Describe and do calculations on power electronic components and their cooling
• Describe and do calculations on common electric machines and converters
• Describe and do calculations on electric power supplies
• Calculate quantities giving electric quality
• Accurately describe and explain the problems that may arise from interference, EMC and impact on the grid in systems with power semiconductors
• Describe and do design of converter fed AC- and DC-drives
• Describe and perform simple calculations on systems for power transmission with high voltage direct current
• Be familiar with measurement methods in systems with power semiconductors
• Do simulations of power electronic systems with dedicated software

PART 2:

• Individual study of selected topics within the field of applied power electronics

Content

PART 1: The three phase system. Electric machines: the DC machine, asynchronous and synchronous (electrically magnetized and permanent magnetized) machines, Single phase and three phase transformers. Power semiconductors and their semiconductor physics. Classification of inverters. Power converters for single and three phase. Converters with inductive load. The need for reactive power. Power calculations. Four-quadrant operation of machines. Commercial inverters and their industrial use. DC-choppers and DC-DC converters. DC Inverters for DC-AC conversion. Multilevel inverters. Resonant converters. Power supply units and uninterruptible power supplies. Dynamic description of switch mode power supplies. Thermal calculations. Thermal resistance and thermal impedance. Simulation of systems with power electronic semiconductor components. PART 2: Theoretical specialization in Applied Power Electronics. Includes, for example:

Space vectors and VSC applications. Transformation between stationary and synchronous coordinate systems. Converter fed DC-drives. Modelling of AC-machines, the inverse gamma model for induction motors, dynamic models for PMSM and reluctance SM. Vector control. Sensorless control. Direct Torque Control. Commercial frequency converters. Power electronic interface between renewable energy sources and the electric grid. Transmission of electric power with high voltage current. HVDC-Classic, VSC-HVDC, FACTS and SVC-equipment. Protective circuits, snubbers. Drivers