| Author: | Chen, Jiahao |
| Title: | Hybrid simulation technique of power electronized power grid |
| Advisors: | Bu, Siqi Steve (EEE) |
| Degree: | M.Sc. |
| Year: | 2024 |
| Department: | Department of Electrical and Electronic Engineering |
| Pages: | 1 volume (unpaged) : color illustrations |
| Language: | English |
| Abstract: | The integration of renewable energy sources, such as solar and wind power, into the power system is typically achieved through the utilization of power electronics devices. In contrast to the traditional thermal power generation with synchronous generators accessed to the power system, the integration of power electronics serves to reduce the system's inertia, which consequently affects the power system's stability. With the interconnection of power grid and higher renewable energy penetration, the power system is gradually characterized with power elecronization, which is a great challenge for the power system’s control, analysis and modelling. The traditional electromechanical transient (RMS, Phasor) simulation model adopts quasi-steady state assumption and has a large simulation step size, which neglects the fast electromagnetic transient behavior inside the system, and thus can efficiently conduct simulation for large-scale power system. On the other hand, the electromagnetic transient (EMT) simulation technique adopts a relatively small simulation step size, which can accurately simulate the fast electromagnetic transient behavior inside the system, whereas the computational burden is excessive for large-scale power system simulation. Hence, it is essential to propose a simulation technique that combines both simulation efficiency and accuracy. The principal objective of this thesis is to propose a hybrid simulation technique based on the dynamic phasor model, which exclusively considers the harmonic components that exert a significant influence on the power electronic devices' dynamic characteristics under different power system’s operation conditions. The simulation accuracy can still be ensured under a relatively large simulation step size for power electronized grid. In this paper, the structure of the power electronic grid is analyzed and the dynamic phasor models of power electronic grid-integrated generation (wind power) and HVDC in it are developed. In the test part, a doubly-fed wind turbine is selected as the research object of renewable energy power supply. The single-machine infinity bus (SMIB) system and the wind farm integrated to WSCC 9 bus power system are used as the test in MATLAB/Simulink. It is verified that the proposed dynamic phasor simulation technique can efficiently and accurately capture the transient behavior of wind farms during the starting state, symmetrical faults and asymmetrical faults. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 8482.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 7.05 MB | Adobe PDF | View/Open |
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