| Author: | Choi, Man-keung |
| Title: | H[8] based damping controller for HVDC system with parallel AC transmission |
| Other Title: | H8 based damping controller for HVDC system with parallel AC transmission |
| Degree: | M.Sc. |
| Year: | 1999 |
| Subject: | Heating -- Control Ventilation -- Control Air conditioning -- Control Electric power systems -- Control Hong Kong Polytechnic University -- Dissertations |
| Department: | Multi-disciplinary Studies Department of Electrical Engineering |
| Pages: | viii, 54 leaves : ill. ; 30 cm |
| Language: | English |
| Abstract: | Rapid advances in power electronics have made it both practicable and economical to design powerful thyristor-controlled devices, such as Flexible AC Transmission Systems (FACTS), for stability enhancements. The discrepancies of existing modeling approaches have limited the feasibility of handling these devices or designing its damping controller. In this report, a versatile and generalized approach to model standard power system components is proposed. The more systematic and realistic representation, accompanied by the development of powerful eigenvalue-analysis techniques, facilitates the study of small signal stability of the power systems. Recently, the robustness of the controller is a major concern in power system control design. As most controller designs are based on some deterministic conditions, their performance may not be adequate under wide range of operating conditions. Due to the inherent fast controllability of power flow in DC links, this supplementary, but meaningful, subject of DC links then becomes very attractive in power engineering. This report demonstrates how to design an H∞ based damping controller for a HVDC link to enhance system damping under different operating conditions. Numerator-denominator perturbation representation is used to represent the model uncertainty and partial pole placement technique is employed to assign the critical mode to a specified location. A robust H∞ controller is successfully designed in step-by-step procedures by treating the change of operating conditions of the highly non-linear power system as model uncertainty and taking into account at the design stage. Simulation results show that the proposed controller is very effective to enhance the performance and robustness of the power system under the predefined uncertainties. Although these studies are developed on selected controller devices or typical system for convenience of discussion, extension to more complex systems can be dealt with in a similar way because of the versatility of the proposed modeling methodology. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| b14854211.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 2 MB | Adobe PDF | View/Open |
Copyright Undertaking
As a bona fide Library user, I declare that:
- I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
- I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
- I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.
Please use this identifier to cite or link to this item:
https://theses.lib.polyu.edu.hk/handle/200/844