This course presents analysis and control methods of power electronics circuits converting and controlling of electric power by using semiconductor switching power devices. It deals with switching transitions in MOSFETs and IGBTs, commutation in voltage-source bridge converters, voltage and current feedback control, applications to grid-connected converters, various grid-connection converters and related emerging technologies.
Analysis of power electronics circuit requires consideration of transient response in a very wide range of time scale from a utility grid period of 20 milli seconds to a switching transition of several hundred nano seconds. Although recent computers have a high calculation performance, a lot of computation would be required to analyze the dynamic response in a long duration with a quire small time step. This course introduceｓ some analysis and modeling methods to solve the dynamic response of the power electronics converters effectively. These methods are also valuable for controlling these converters. Student are expected to study these fundamental methods as well as their applications to various other practical problems.
By the end of the course, students will be able to:
1) Understand the basic structure and driving methods for power MOSFETs and insulated gate bipolar transistors (IGBTs).
2) Understand the circuit topology and operating principles in basic power electronics circuits.
3) Analyze the operating characteristics of basic power electronics circuits.
4) Understand the control strategy for grid connection converters.
5) Design the main circuit and the controller in a simple grid connection converter.
Power electronics, converter topologies, power semiconductor devices, current and voltage control methods, and grid connection converters.
|Intercultural skills||Communication skills||Specialist skills||Critical thinking skills||Practical and/or problem-solving skills|
The instructor will first present some circuit topologies, control schemes, and/or analysis methods. Students will have discussions and give presentations on the assigned topics in the class.
|Course schedule||Required learning|
|Class 1||Introduction of power electronics: evolution of power electronics in various applications, duality in power electronics circuits, canonical switching cells||Discussion on the similarity and difference between various power converters|
|Class 2||Switching devices for voltage-source converters: MOSFETs and IGBTs, switching modes, switching transitions, gate drive circuits||Design of a gate drive circuit and estimation of the switching periods|
|Class 3||Soft switching and snubber circuit: power losses in switching devices, safety operating area, snubber circuit, soft switching||Discussion on the principle and performance of a soft switching circuit|
|Class 4||Resonant converter and their applications: resonant conversion circuits, operating modes, power control methods||Performace analysis of a resonant converter|
|Class 5||Pulse width modulation: modulation methods, synthesized voltage waveforms in PWM converters, double Fourier analysis||Synthesizing of voltage waveforms in a three-phase PWM converter|
|Class 6||Modeling of voltage-source converters: state average method, various modeling methods, switching function and duty ratio, control response||Analysis of coupling between an ac inductor and a dc capacitor|
|Class 7||Digital current control: micro processer and micro controller, signal sampling and reference update, digital current feedback control and z-transform||Analysis of the transient response of a digital current feedback control method|
|Class 8||Grid-connection converters: rectifiers, dc power transmission converters, performance of dc voltage control||Discussion on the transient response of the dc-voltage and ac-current control|
|Class 9||Current control methods for grid connection: active and passive impedance, feedforward compensation, synchronous reference frame, and decoupling control||Discussion of current control methods and applications|
|Class 10||Static var compensators: shunt and series devices, TCRs ans TSCs, STATCOMs, TCSCs, SSSCs, and UPFCs||Comparison of the various compensators|
|Class 11||Active power filters: circuit configurations, harmonic detection methods, control methods, and compensation methods, and hybrid harmonic-compensation systems||Performance analysis and comparison of harmonics compensators|
|Class 12||Magnetic components and flux deviation: modeling of magnetic elements, the cause of the flux deviation, and compensation methods||Discussion on dynamic control for a converter equipped with a transformer|
|Class 13||Power and energy variations and disturbances in grid connection converters: reactive power, harmonics components, negative sequence currents, and flicker components||Design of dc link capacitor for grid connection converters|
|Class 14||Multilevel converters: diode-clamped converters, capacitor clamped converters, cascaded converters, and modular multilevel converters||Design of an inverter system for a specific application|
|Class 15||New technologies in power conversion: matrix converters, inductor-less converters, z-source inverters, boost inverters, high-frequency cycloconverters, and so on||Discussion on new applications, requirements, and appropriate converter topology|
Lecture slides will be delivered through OCW/i.
1) John G. Kassakian, Martin F. Schlecht, George C. Verghese, Principles of Power Electronics, Addison-Wesley Series in Electrical Engineering, ISBN-13: 978-0201096897
2) Ned Mohan, Tore M. Undeland and William P. Robbins, Power Electronics: Converters, Applications, and Design, ISBN-13: 978-0471226932
Grading depends on the reports about discussions in every classes (2% times 15 classes = 30%) and the final examination (70%).
This course is based on the knowledge taught by the undergraduate "power electronics" course.