Small synchronous machine protection during voltage sags caused by MV grid faults
This paper analyses the impact of symmetrical and unsymmetrical voltage sags caused by distribution and transmission faults on the dynamic behaviour of small salient-pole synchronous machines connected to the MV grid, and proposes the modification of the protection settings to increase machine avail...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2018 |
| 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:2117/112630 |
| Acceso en línea: | https://hdl.handle.net/2117/112630 https://dx.doi.org/10.1016/j.epsr.2017.11.002 |
| Access Level: | acceso abierto |
| Palabra clave: | Synchronous generators Electric fault location fault current machine stability overcurrent protection synchronous machine undervoltage protection voltage sag Maquinària elèctrica sincrònica Sistemes de distribució d'energia elèctrica -- Estabilitat Àrees temàtiques de la UPC::Enginyeria elèctrica::Maquinària i aparells elèctrics::Control elèctric |
| Sumario: | This paper analyses the impact of symmetrical and unsymmetrical voltage sags caused by distribution and transmission faults on the dynamic behaviour of small salient-pole synchronous machines connected to the MV grid, and proposes the modification of the protection settings to increase machine availability. As faults are considered, the voltage recovery is assumed to occur in a discrete way, in the fault current zeroes. The voltage sag effects include current and torque peaks, speed and load angle increase, and possible machine instability. Results from many cases are discussed, especially the positive-sequence voltage influence on machine stability. The study concludes that machine availability during unsymmetrical sags can be increased by modifying the undervoltage and overcurrent protection settings (the former should be based on the positive-sequence voltage instead of line-to-line voltages used in current settings). |
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