| Author: | Liu, Jie |
| Title: | Comparative study and simulation of various types of multilevel converters |
| Advisors: | Liang, Hui-wen Rebecca (EEE) |
| Degree: | M.Sc. |
| Year: | 2025 |
| Subject: | Electric current converters Electric circuit analysis Power electronics Hong Kong Polytechnic University -- Dissertations |
| Department: | Department of Electrical and Electronic Engineering |
| Pages: | 97 pages : color illustrations |
| Language: | English |
| Abstract: | In light of the urgent issues posed by the energy crisis and environmental deterioration, there is a growing adoption of technologies such as renewable energy sources, electric vehicles, and energy storage systems. Nevertheless, the incorporation of these innovative energy solutions into the conventional power grid presents significant challenges, primarily due to inconsistencies in frequency and amplitude. This situation underscores the necessity for the implementation of power electronic converters. Focusing on multilevel converters (MLCs) within hybrid energy storage systems, this study explores circuit topology and modulation methods. A comprehensive literature review of MLCs, including neutral point clamped (NPC), cascaded H-bridge (CHB), flying capacitor (FC), and modular multilevel converter (MMC) topologies, is provided, highlighting their operating principles, advantages, and applications. The thesis further investigates the NPC power conversion system (NPC-PCS) and MMC virtual synchronous generator (MMC-VSG) systems. For the NPC-PCS system, a detailed analysis of the mathematical model, lithium-ion battery control, and bidirectional converter strategy is conducted, with simulation results confirming the system's stability and control efficacy. For the MMC-VSG system, the study examines the mathematical model and VSG-based control methods, demonstrating excellent dynamic response and voltage support capabilities through simulation. This research establishes a solid theoretical foundation for future advancements in multilevel converter applications. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 8497.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 4.56 MB | Adobe PDF | View/Open |
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