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A Wide-Area Signal Based Decentralized Coordinated Excitation Control For Power System

Posted on:2012-11-19Degree:MasterType:Thesis
Country:ChinaCandidate:C C MaoFull Text:PDF
GTID:2132330338990842Subject:Control theory and control engineering
Abstract/Summary:PDF Full Text Request
Along with the large scale system interaction, the power industry restructuring and continuous increase of power demands, modern power sys-tems have become more and more complex wide-area large-scale systems and operated more and more close to their maximum operation conditions. Transient stability control is in the face of sharp conflicts which are between the highly complex control process and high degree of the requirements of control performance. Only using the general control theory techniques can't solve some of the power system control problems, so the introduction of new techniques to study the large-scale power system transient stability control is particularly important.Firstly, a synchronous generator model is constructed for power system transient stability. According to Park formula, introduced the equivalent variable, practical third-order synchronous generator model is elicited.Then, by combining the T-S fuzzy model and robust H_∞control theory, the uncertainty robust H_∞decentralized excitation control method is proposed, as well as the sufficient condition for the system stability and existence of controllers. The control problem is changed into an LMI convex optimization problem which can be obtained by MATLAB toolbox. Finally, the simulation verified effectiveness of the program.At last, on the basis of the power system decentralized control, this paper proposed a decentralized coordinated excitation controller which is based on the wide-area signals and multi-agent structure. The study is divided into the following parts:(1) Based on wide area measurement techniques and multi-agent system theory, the power system decentralized coordinated control structure is proposed;(2) The fuzzy control algorithm is introduced in the hinge agents, and the hinge agent robust controller based on the fuzzy inferential system is designed;(3) A series of optimization problem equation are given to help the control center agent to choose strategy;(4) State observer state feedback controller is proposed for the decentralized control of the generator agents. The simulation results show that, comparing with the single decentralized controller, the decentralized coordinated control based on the multi-agent system can ensure better improvement of power system transient stability.
Keywords/Search Tags:Power system, Decentralized control, Decentralized coordinated control, Transient stability, Excitation control, T-S fuzzy model, Robust H_∞control, Multi-Agent system, Wide-area measurement
PDF Full Text Request
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