Module Title - HVDC and FACTS
Number of credits – 20
The deregulation of the electricity market together with increasing constraints resulting from social opposition to the installation of new facilities brings great pressure to the operators of transmission and distribution systems. Large scale integration of renewable energy into power supply brings further pressure on how to operate and control future power networks.
These new trends require the need for flexibility, power quality and increased availability of electricity transmission and distribution systems by using new devices which can be implemented with limited investments, short delivery times and short planning and decision making horizons.
FACTS (Flexible AC Transmission Systems) is a terminology to describe a whole family of concepts and devices for improved use and flexibility of electrical power systems. HVDC is used for long distance power delivery, interconnection of asynchronous AC systems and integration of large scale renewable energy systems. There are two types of HVDC systems such as LCC HVDC and VSC HVDC.
The course covers the basic concepts and operating principles of HVDC and FACTS. The new developments in multi-terminal HVDC Grid will be discussed.
By the end of the module you will be able to:
Explain the operating principles of the circuit configuration for:
- Thyristor Controlled Reactor (TCR)
- Thyristor Switched Reactor (TSR)
- Thyristor Switched Capacitor (TSC)
- AC Harmonic Filters (HF)
- Shunt Capacitors (SC)
- Shunt Reactors (SR)
- Explain an SVC (Static Voltage Compensator) butterfly diagram, determine component ratings and numerically analyse its performance.
- Explain the operation of SC; their design rating and the device location.
- Explain the basic operating principles of the Thyristor Switched Series Capacitor (TSSC).
- Explain STATCOM technology based on multi-module converters; analyse the circuit configuration of a STATCOM and the Butterfly diagram of a STATCOM.
- Explain types of HVDC transmission including types of transmission and their applications such as overhead line, cable, Back-to-Back configurations.
- Numerically analyse the operation of a HVDC system.
Analyse and compute the operational losses of:
- Typical LCC converter station topology
- Thyristor valves Converter transformers
- AC harmonic filters
- Auxiliary plant
- Analyse static characteristics; analyse multiple LCC converters in an AC system and component ratings through numerical examples.
- Analyse how VSC differs from LCC and gain an understanding of operational losses.
- Analyse the operation of multi-module VSC based on the half-bridge topology and explain the factors affecting operational losses.
- Analyse the operation of multi-module VSC with fault blocking capability and explain the factors affecting operational losses.
- Analyse topologies associated with multi-terminal HVDC.
- Have the skills to perform complex FACTS and HVDC system studies using simulation tools, for instance, MATLAB.
Teaching and assessment:
- Semester 2
- A written unseen 2 hour examination answering 3 questions from 4 (50%).
- Coursework comprised of one laboratory report of 6 pages (20%)
- report on case studies of 2,500 words, approximately 10 pages (30%).