| Author | Nampetch Porntharukcharoen |
| Call Number | AIT Thesis no.ET-00-13 |
| Subject(s) | Electric power systems--Control
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of the Master of Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | Since numerous power systems throughout the world have suffered with abnormal voltage behavior, a sequence of events occurs which weakens the power systems, therefore ultimately results in its failure and collapse. It is becoming increasingly imp01iant for power system planning and operating engineers to be capable of performing comprehensive and effective power flow control analysis and power flow studies. Moreover, power systems of today are large mechanically controlled as power transfers grow, the collective acronym FACTS has been adopted in recent years to describe a wide range of large power electronic based controllers. These may, at present or in the future, be used to increase the flexibility of power systems and thus make them more controllable. Results in the development of power semiconductor devices which have opened up new opportunities in the development of the FACTS equipment. The most effective device is the Unified power flow controller (UPFC) which is capable to control both the transmitted real power and, independently, the reactive power flows at the sending-end and the receiving-end of transmission. Regarding to various advantages of UPFC devices, contributed the propose objective of a thesis study to conducting a work with a comprehensive and systematic approach for mathematical modeling of UPFC in power flow studies togethet with a number of cases that is tested with and without a presence of UPFC in systems. Furthermore, the thesis also confirms and evaluates the basic control concepts and operation and the unique capabilities of the UPFC via case studies. The load flow programming through a MATLAB applicational software is developed to carry out the system state variables so that system behavior can be analyzed. Additionally, a Decoupled Newton-Raphson power flow mothod is used to obtain the system state variables. Case studies are conducted on two sample systems which are IEEE30 buses system and EGAT160 buses, Thailand power system. Totally, 3 scenarios have been presented to confirm a versatile capabilities of UPFC. The effects of UPFC on the systems are simulated through the first scenario by comparing a load flow state variables of systems with and without UPFC installation. Then, with an existence of UPFC in transmission line, evaluating that how it can improve system performance while at the same time solving power system disturbances problems. Ultimately, the remaining two scenarios are also analyzed and evaluated through second and third scenario. The load growth and the overloading of transmission lines are studied and eventually be solved by the placement of UPFC into a network. Additionally, this thesis studies also provides a corroborated conslusions of the capabilities of UPFC as well as to meet an attempt to fulfill the thesis control objectives. |
| Year | 2000 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Energy Technology (ET) |
| Chairperson(s) | Surapong Chirarattananon; |
| Examination Committee(s) | Yu, Cunyi;Thukaram, Dhadbanjan; |
| Scholarship Donor(s) | Asian Institute of Technology (Partial Scholarship) |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2000 |