| Author | Than Oo |
| Call Number | AIT Thesis no.ET-04-04 |
| Subject(s) | Frequencies of oscillating systems
Electric power systems
|
| Note | A thesis submitted in partial fulfillment of the requirements for a degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ET-04-04 |
| Abstract | Much of the industry effort and interest related to system stability since the 1960s has
been concentrated on transient stability. As a consequence, the principal tool for
stability analysis in power system design and operation has been the h·ansient stability
program. Significant improvements in transient stability performance of power systems
have been achieved through use of high-speed fault clearing, high initial-response
exciters, series capacitors and special stability aids.
Accompanying the above h·ends has been an increased tendency of power systems to
exhibit oscillatory instability. Higher-response exciters, while improving h·ansient
stability, adversely affect small signal stability associated with local plant modes of
oscillation by introducing negative damping. The effects of fast exciters are
compounded by the decreasing strength of transmission systems relative to the size of
generating stations.
Another source of oscillat01y instability problem has been the formation, as a
consequence of growth in interconnections among power systems, of large groups of
closely coupled machines connected by weak links. With heavy power h·ansfers, such
system exhibits inter area modes of oscillation of low frequency. In many situations,
the stability of these modes has become a source of concern. Historic event of 1996,
August blackout in WSCC system, proved that such instability could be h·iggered.
Such problems have been solved through use of power system stabilizers. Furthermore,
with the more recent development of Flexible AC Transmission System (FACTS)
controllers, there have been a number of studies for the use of these conh·ollers in
power system oscillation damping. Though not yet well developed, underpinned
research suggests that unified power flow controller (UPFC) is a most promising power
system controller.
Keeping this in mind, this thesis carried out thoroughly analyzing and investigating the
effects of UPFC on oscillation damping by using MATLAB based research tools
namely, Power system analysis toolbox (PSAT) and Power System Toolbox (PST).
The powerful matlab based optimization tool called Genetic Algorithm Optimization
Toolbox (GAOT) was successfully applied to search the optimal parameters of UPFC
for the objective of oscillation damping. |
| Year | 2004 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ET-04-04 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Energy Technology (ET) |
| Chairperson(s) | Nadarajah Minthulananthan |
| Examination Committee(s) | Surapong Chirarattananon
Dr. Weerakorn Ongsakul |
| Scholarship Donor(s) | AIT Fellowship |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2004 |
