Power Electronics is enabling technology for achieving various power conversion by using semiconductor devices as a power switch, and it is applied to electric power systems because it can actively control voltage, current, and frequency at the same time. The aim of this lecture is to understand operating principles, control method, and power balance of power converters for electric power systems.
First of all, the overview and problems of electric power systems along with the role of power converters are explained, followed by discussion regarding how to achieve high-voltage, high-power conversion with less voltage/current harmonics. Then, the control methods of three-phase power converters are discussed.
Secondly, the operating principles, control method, and modeling of FACTS devices such as an SVC, a STATCOM, an HVDC/BTB system are explained with a focus on operating principles and their benefits. Then, the classification, operating principles, and applications of modular multilevel cascade converters (MMCCs) with different circuit configurations are explained with a focus on its application to STATCOM and/or BTB/HVDC.
By the end of this course, students will able to:
1) Understand and explain operating principles and control methods of power converters for electric power systems.
2) Understand how to model power converters, and able to model power converters for electric power systems.
3) Explain operating principles and control methods of FACTS devices which are representatives of power converters for electric power systems.
4) Explain operating principles and control methods of modular multilevel cascade converters with different configurations.
Power electronics, electric power systems, FACTS devices, reactive power compensators, HVDC systems, modular multilevel cascade converters.
|✔ Specialist skills||Intercultural skills||Communication skills||Critical thinking skills||✔ Practical and/or problem-solving skills|
Each of the lectures will be carried out by using handouts which will be uploaded to OCWi before or after the lecture.
|Course schedule||Required learning|
|Class 1||1. Overview and problems of electric power systems, and the role of power converters. 2. Methods for achieving high-voltage, large-capacity power conversion, as well as reducing harmonic voltages.||Understand problems of electric power systems and the role of power converters, as well as methods for achieving high-voltage, large-capacity power conversion with less harmonic voltages by reading the 1st handout carefully.|
|Class 2||1. Current control method of a dc circuit and a single-phase ac circuit. 2. Circuit equations of a three-phase ac circuit. 3. Decoupled current control of a three-phase ac circuit. 4. Relationship of instantaneous power.||Understand the current control method of dc, single-phase, and three-phase circuits as well as the relationship of instantaneous power by reading the 2nd handout carefully.|
|Class 3||1. Overview of FACTS devices. 2. Reactive power compensators (SVC and STATCOM).||Understand the overview of FACTS devices, and the control method along with operating principles of reactive power compensators (i.e., SVC and STATCOM) by reading the 3rd handout carefully.|
|Class 4||1. Thyristor-Controlled Series Capacitor (TCSC). 2. Static Synchronous Series Compensator (SSSC). 3. Unified Power Flow Controller (UPFC). 4. High-Voltage Direct-Current (HVDC) and Back-To-Back (BTB) systems.||Understand the representatives of the FACTS devices such as TCSC, SSSC, UPFC, HVDC, and BTB in terms of control method and operating principles by reading the 4th handout carefully.|
|Class 5||1. Overview of modular multilevel cascade converters (MMCCs). 2. Classification and characteristics of MMCCs.||Understand the overview of modular multilevel cascade converters (MMCCs), and their classification and characteristics.|
|Class 6||1. Operating principles of a single-phase MMCC. 2. Operating principles of a single-delta-configured MMCC (SDBC). 3. Operating principles of a single-star-configured MMCC (SSBC).||Understand single-phase MMCCs, single-delta-configured MMCCs (SDBC), and single-star-configured MMCCs (SSBC) in terms of the control method and operating principles.|
|Class 7||1. Overview of double-star-configured MMCCs (DSCC and DSBC). 2. Operating principles of a half-bridge-configured MMCC. 3. Operating principles of the DSCC (Double-Star Chopper Cells). 4. Operating principles of the DSBC (Double-Star Bridge Cells).||Understand the overview of double-star-configured MMCCs, along with a half-bridge-configured MMCC, DSCC, and DSBC in terms of control method and circuit equations.|
To enhance effective learning, students are encouraged to spend approximately 100 minutes preparing for class and another 100 minutes reviewing class content afterwards (including assignments) for each class.
They should do so by referring to textbooks and other course material.
Ned Mohan, Tore M. Undeland and William P. Robbins, Power Electronics: Converters, Applications, and Design, ISBN-13: 978-0471226932
Student's knowledge will be assessed by reports (100%).
This course can be taken without taking the graduate courses “EEE.P412: Power electronics circuits and systems” and “EEE.P414: Power electronics control and analysis”.