Design and analysis of battery chargers for electric vehicles based on multilevel neutral-point-clamped technology
(English) This thesis presents an exploration into the field of advanced battery charger design and control, addressing critical needs across a spectrum of modern applications. It first outlines the increasing importance of battery chargers in various domains, emphasizing the requirements of efficie...
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| Tipo de recurso: | tesis doctoral |
| Estado: | Versión publicada |
| Fecha de publicación: | 2024 |
| País: | España |
| Institución: | CBUC, CESCA |
| Repositorio: | TDR. Tesis Doctorales en Red |
| OAI Identifier: | oai:www.tdx.cat:10803/693421 |
| Acceso en línea: | http://hdl.handle.net/10803/693421 https://dx.doi.org/10.5821/dissertation-2117-424259 |
| Access Level: | acceso abierto |
| Palabra clave: | Àrees temàtiques de la UPC::Enginyeria electrònica 621.3 629 |
| Sumario: | (English) This thesis presents an exploration into the field of advanced battery charger design and control, addressing critical needs across a spectrum of modern applications. It first outlines the increasing importance of battery chargers in various domains, emphasizing the requirements of efficiency, adaptability, and reliability. A detailed review of existing technologies and control strategies underscores the urgent need for innovation in charger design. The focus of this research is the design and development of a battery charger topology. This topology is based on cascaded multilevel converters that provide bidirectional power flow and galvanic isolation. It addresses the charging requirements of multiple batteries connected in series and incorporates two distinct dc links. The charger develops from a three-level configuration to a four-level configuration, finally leading to a generalized n-level charger. Integral to this work is the formulation of comprehensive linear models, from state-space to s-domain representations, which highlight the charger's complex dynamics. This allows for an in-depth understanding of its operational behavior and control characteristics. The thesis also introduces a well-tuned control system that synchronizes the operation of the two multilevel converters. This ensures optimal operation of the charger. The ac-dc converter regulates the dc link voltage and grid power factor, while the dc-dc converter regulates the shared dc link voltage and battery bank charging currents. The user has the flexibility to determine which converter controls the dc-link voltage regulation. A key innovation is the independent charge control for each battery bank. This feature allows batteries to reach full charge independently, regardless of their initial state of charge or rated capacity. This improves overall efficiency and battery management. In addition, the thesis provides a practical and straightforward design methodology for compensators based on the charger's linear schemes. It employs uncompensated gain loops and uses Bode plots for effective tuning of compensator parameters. Finally, the thesis outlines future research directions. These include experimental validation, exploring vehicle-to-grid integration, exploring nonlinear control systems, assessing off-board charger viability, examining renewable energy integration, enhancing grid-supporting features, evaluating scalability and efficiency, and evaluating real-world applications. Together, these efforts promise to advance and optimize the proposed battery charger, placing it as a central element in the field of efficient and sustainable energy systems. |
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