Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor | Department of Electrical and Electronic Engineering | en_US |
| dc.contributor.advisor | Bu, Siqi (EEE) | en_US |
| dc.creator | Zhang, Hao | - |
| dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/14130 | - |
| dc.language | English | en_US |
| dc.publisher | Hong Kong Polytechnic University | en_US |
| dc.rights | All rights reserved | en_US |
| dc.title | Oscillation monitoring and evaluation for multi-machine power systems | en_US |
| dcterms.abstract | The analysis of low-frequency oscillation (LFO) from modern power system is getting more complex, and more efficient methods are needed to reduce the complexity. Applying energy flow analysis (EFA) to locate the source of oscillations and estimate their damping performance is a more advanced approach. Therefore, this thesis focuses on the EFA method, based on which LFOs can be quickly found. And analyze their damping performance and suppress them. In this thesis, the connection between the eigenvalue and the oscillation mode is derived and demonstrated in detail, and the oscillation features corresponding to the real and imaginary parts of the eigenvalues are indicated. The derivation of the swing equation, which is regarded as the core of the mathematical generator model, is introduced. And the third-order model is further derived. The mechanisms of negative damping oscillations and forced oscillations are investigated. The energy function is also deduced, in which the study is focus on the dissipated oscillatory energy. | en_US |
| dcterms.abstract | The following section presents a method for searching the oscillatory generator when LFO occurs in a system. This method involves calculating the dissipation of the oscillatory energy flow in each synchronous generator to determine the generator where the oscillation is located. The damping torque coefficient, which can be calculated in different domains, is illustrated. The equivalence between EFA approach and the approach based on modeling is derived. Two PSS models used in this thesis are described. The methodology based on this thesis is validated in a four-machine, two-region system via MATLAB. The dissipation of oscillatory energy is employed to identify the location of the generator's oscillation. The experimental results, reflected by two distinct perturbations, are subjected to analysis and comparison. After adding the PSS, the improvement is analyzed by comparing it with the case when it is not added. The equivalence of approaches of two different domains are demonstrated by the EFA results. | en_US |
| dcterms.extent | 1 volume (various pagings) : color illustrations | en_US |
| dcterms.isPartOf | PolyU Electronic Theses | en_US |
| dcterms.issued | 2024 | en_US |
| dcterms.educationalLevel | M.Sc. | en_US |
| dcterms.educationalLevel | All Master | en_US |
| dcterms.accessRights | restricted access | en_US |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 8594.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 3.3 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/200/14130