Implementation of DC/DC converters in hybrid LCC-VSC HVDC grids
This Master Thesis presents the modelling, control and simulation of a hybrid multi-terminal High Voltage Direct Current (HVDC) grid. This network is composed by two point-to-point lines linked by a DC/DC converter. One point-to-point line is based on Line-Commutated Converters (LCC) and the other o...
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| Formato: | tesis de maestría |
| Fecha de publicación: | 2019 |
| País: | España |
| Recursos: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/182322 |
| Acesso em linha: | https://hdl.handle.net/2117/182322 |
| Access Level: | acceso abierto |
| Palavra-chave: | Electric current converters DC-to-DC converters Convertidors de corrent elèctric Convertidors continu-continu Àrees temàtiques de la UPC::Enginyeria elèctrica |
| Resumo: | This Master Thesis presents the modelling, control and simulation of a hybrid multi-terminal High Voltage Direct Current (HVDC) grid. This network is composed by two point-to-point lines linked by a DC/DC converter. One point-to-point line is based on Line-Commutated Converters (LCC) and the other one is based on Voltage Source Converters (VSC), modeled as Modular Multilevel Converters (MMC). These two technologies are the most used ones in HVDC. The DC/DC converters chosen to analyze the multi-terminal grid are the Front-to-Front MMC and the DC-MMC. In order to achieve the final multi-terminal HVDC grid, the basics of both HVDC technologies are studied. It also includes the modelling, control and simulation of two point-to-point lines. One for LCC technology and the other one for VSC technology. The principles of DC/DC converters are also studied, including the modelling and control of a Front-to-Front MMC converter and a DC-MMC converter. Finally, simulations of the multi-terminal grid are performed with Matlab Simulink in di↵erent scenarios, including four cases for each DC/DC converter. In these di↵erent cases the DC/DC converter is placed regulating the DC voltage or controlling the power flow in the di↵erent point-to-point links. |
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