Técnicas de control para la mejora de la estabilidad en redes eléctricas DC con convertidores operando a potencia constante
Some electrical devices in direct current (DC) networks, under certain operating characteristics, behave as constant power loads (CPLs). This behavior is defined by presenting negative incremental resistance, compromising the stability of the supply networks. The current evolution of electrical netw...
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| Tipo de recurso: | tesis doctoral |
| Fecha de publicación: | 2022 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | español |
| OAI Identifier: | oai:upcommons.upc.edu:2117/369089 |
| Acceso en línea: | https://hdl.handle.net/2117/369089 https://dx.doi.org/10.5821/dissertation-2117-369089 |
| Access Level: | acceso abierto |
| Palabra clave: | Àrees temàtiques de la UPC::Enginyeria electrònica |
| Sumario: | Some electrical devices in direct current (DC) networks, under certain operating characteristics, behave as constant power loads (CPLs). This behavior is defined by presenting negative incremental resistance, compromising the stability of the supply networks. The current evolution of electrical networks favors the proliferation and increase of this unstable behavior. In this research, a stability analysis method is presented that allows verifying a sufficient condition for the local stability of linear and time invariant DC circuits with CPLs, for all possible equilibria of the system that arise when varying the power consumed by the CPLs. Furthermore, this method is expressed by linear matrix inequalities that can be verified by convex programming. It is also proposed to connect a stabilizing device in parallel, given an accessible connection port in the electrical network, which through an adequate control law, allows ensuring the local stability of linear and time-invariant DC networks with CPLs. The techniques used to obtain the control law have been H8 control, self-tuning control, and non-linear control. In addition, it is shown that the proposed solution meets the objectives established a priori, based on the worst-case regarding the system stability, through numerical results in simulation and experimental results obtained in a prototype plant designed and built within the framework of this research. |
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