| Author: | Huang, Ziheng |
| Title: | Grid-forming and grid-following converter integration studies for future renewable-dominated power systems |
| Advisors: | Bu, Siqi (EEE) |
| Degree: | M.Sc. |
| Year: | 2024 |
| Department: | Department of Electrical and Electronic Engineering |
| Pages: | 96 pages : color illustrations |
| Language: | English |
| Abstract: | With the rapid development of renewable energy and distributed generation, the proportion of renewable energy in the power grid is continuously increasing. This poses new challenges to the stability and reliability of the current synchronous machine-dominated power systems. In this situation, Grid-Following (GFL) and Grid-Forming (GFM) converters, as crucial components prior to the integration of most new energy sources into the grid, hold significant research and application value. This thesis aims to conduct an in-depth study of GFL and GFM converters, exploring their control effects in the new energy grid, and providing a comprehensive comparison of their control stability, thereby offering theoretical support and technical guidance for the planning and operation of new energy grids. To begin with, this thesis provides a review of the common control strategies and principles of GFL and GFM converters in recent years. The control of GFL includes PQ control, droop control, and virtual inertia control, while the control structure of GFM includes pre-synchronization, VSG control, and adaptive rotational inertia control. After a thorough understanding of the structure and principles of these control strategies, this thesis proceeds to mathematically model and analyze the synchronous stability of these control strategies. The mathematical modeling accurately describes the dynamic characteristics of GFL and GFM converters, laying the foundation for subsequent simulation analysis. Furthermore, through synchronous stability analysis, the stability performance of GFL and GFM converters in the power grid is evaluated. Subsequently, this thesis conducts simulation analyses of GFL and GFM converters in both single-machine infinite bus systems and IEEE 39-node systems. By comprehensively evaluating the stability of these two control strategies under different operating conditions, this study provides valuable references for the practical application of GFL and GFM converters in various system scenarios. At last, this thesis summarizes the research findings and highlights the positive significance of GFL and GFM converters for modern power systems dominated by renewable energy. The stable operation of new energy grids is of great significance for energy security and environmental protection. In-depth analysis of the impact of GFL and GFM converters on the grid is crucial for the planning and operation of distributed generation systems, offering important theoretical and practical implications. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 8596.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 5.09 MB | Adobe PDF | View/Open |
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