| Author: | Cheng, Yitao |
| Title: | Cyber physical power system modelling and stability analysis |
| Advisors: | Bu, Siqi (EE) |
| Degree: | M.Sc. |
| Year: | 2021 |
| Subject: | Cooperating objects (Computer systems) -- Automatic control Smart power grids Electric power system stability Hong Kong Polytechnic University -- Dissertations |
| Department: | Department of Electrical Engineering |
| Pages: | xiv, 64 pages : color illustrations |
| Language: | English |
| Abstract: | Traditional power grids are mostly lack of interacting technologies. With the mature development of Information Communication Technologies (ICT), the communication technologies are urgently needed to be injected into current power systems, which is called Cyber Physical Power System. In order to solve the low frequency oscillation problem occurs frequently in the CPPS daily operation, Power System Stabilizer (PSS) is embedded in the system. The Wide Area Damping Control (WADC) adopts Wide Area Measurement System (WAMS) technologies to create an additional excitation signal, which can solve the inter-area low frequency oscillation problem effectively. However, the time delays created in the WAMS process could not be neglected and affect the operation of the CPPS seriously. So, Firstly, a time delayed CPPS model described in differential delayed algebraic equations (DDAEs) form will be proposed, the system is modelled based on the opened-loop power system (state variables) and cyber-physical layer (WAMS time delayed part by using Pade approximation), then combine them. Secondly, in order to avoid unstable operation of the Time delayed CPPS, it is necessary to do the small signal stability analysis. The Characteristic equations of the DDAEs model of the CPPS is proposed, and then to decrease the difficulties of solving eigenvalues, and then by eliminating delayed items to a infinite number, the DDAEs model will be transformed into delayed differential equations (DDEs). In addition, the effects of different time delays signals to the system will be verified in this paper. The Prony algorithm analysis is also presented to verify the stability of the designed model. More importantly, an improved wide area PSS design scheme will be proposed by using the transfer function residues method and the random time delay designing scheme is also proposed. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 5920.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 1.68 MB | Adobe PDF | View/Open |
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