Contigency analysis and protection schemes of HVDC grids
High-voltage direct current (HVDC) grids has been identified as one of the promising solution for the ongoing energy transition but its deployment is being limited due to some challenges. This study provided a comprehensive overview of HVDC transmission systems and its extension into grids, and afte...
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| Tipo de recurso: | tesis de maestría |
| Fecha de publicación: | 2024 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/420118 |
| Acceso en línea: | https://hdl.handle.net/2117/420118 |
| Access Level: | acceso abierto |
| Palabra clave: | Electric currents, Sirect Electric current converters High voltages Corrents continus Convertidors de corrent elèctric Alta tensió Àrees temàtiques de la UPC::Enginyeria elèctrica::Alta tensió |
| Sumario: | High-voltage direct current (HVDC) grids has been identified as one of the promising solution for the ongoing energy transition but its deployment is being limited due to some challenges. This study provided a comprehensive overview of HVDC transmission systems and its extension into grids, and afterwards focused on protection of DC grids (one of the main challenges of the DC grids), particularly voltage source converter (VSC) based DC grids. It was studied that DC grids protection devices and protection philosophies differ in strength, and their area of applications influence their selection. A DC grid and a hybrid DC circuit breaker were modelled for the study. The converters in the DC grid are connected as symmeteric monopoles, and each of them is represented with an equivalent circuit of DC voltage source connected in parallel to a series RLC (resistance, inductor and capacitor). The study shows that the modelled hybrid DC breaker could open within 2.85 ms after the fault. Furthermore, the impact of the fault on other cables indicates the need for a more fast opening device and a robust control algorithm that could handle the control and operation of the DC circuit breakers within the network hence ensuring a resilient grid system with a fault-ride through capability. |
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