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| Title | OPTIMAL UPFC CONTROL AND OPERATIONS FOR POWER SYSTEMS |
| Author | Wu, Xiaohe
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| Keywords | Dissertations, Academic -- Engineering and Computer Science
Engineering and Computer Science -- Dissertations, Academic
Mathematical programming
Optimal control
Sub optimal control
Transient stability
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| Abstract | The content of this dissertation consists of three parts. In the first part, optimal control strategies are developed for Unified Power Flow Controller (UPFC) following the clearance of fault conditions. UPFC is one of the most versatile Flexible AC Transmission devices (FACTs) that have been implemented thus far. The optimal control scheme is composed of two parts. The first is an optimal stabilization control, which is an open-loop 'Bang' type of control. The second is an suboptimal damping control, which consists of segments of 'Bang' type control with switching functions the same as those of a corresponding approximate linear system. Simulation results show that the proposed control strategy is very effective in maintaining stability and damping out transient oscillations following the clearance of the fault. In the second part, a new power market structure is proposed. The new structure is based on a two-level optimization formulation of themarket. It is shown that the proposed market structure can easily find the optimal solutions for the market while taking factors such as demand elasticity into account. In the last part, a mathematical programming problem is formulated to obtain the maximum value of the loadibility factor, while the power system is constrained by steady-state dynamic security constraints. Aniterative solution procedure is proposed for the problem, and the solution gives a slightly conservative estimate of the loadibility limit for the generation and transmission system. |
| Adviser | Qu, Zhihua
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| Publisher | University of Central Florida |
| Degree | Ph.D.
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| Degree Discipline | Department of Electrical and Computer Engineering
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| Degree Grantor | Engineering and Computer Science
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| Degree Program | Electrical and Computer Engineering
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| Graduation Date | 2004-05-01 |
| Type | Doctoral dissertation
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| Access Level | Public - Allow Worldwide Access
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| Release Date | 2004-05-01 |
| Repository | University Archives
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| Repository Collection | Electronic Theses and Dissertations
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| Identifier | CFE0000052 |
| Access Link | http://purl.fcla.edu/fcla/etd/CFE0000052 |