dc.contributor | Rivera Rodríguez, Sergio Raúl | |
dc.contributor | Mojica Nava, Eduardo | |
dc.contributor | Grupo de Investigación EMC-UN | |
dc.creator | Dorado Rojas, Sergio Andrés | |
dc.date.accessioned | 2021-05-31T20:52:16Z | |
dc.date.available | 2021-05-31T20:52:16Z | |
dc.date.created | 2021-05-31T20:52:16Z | |
dc.date.issued | 2021-05-31 | |
dc.identifier | https://repositorio.unal.edu.co/handle/unal/79578 | |
dc.identifier | Universidad Nacional de Colombia | |
dc.identifier | Repositorio Institucional Universidad Nacional de Colombia | |
dc.identifier | https://repositorio.unal.edu.co/ | |
dc.description.abstract | Non-conventional renewable energies represent a significant challenge for electric grids due to the technicalities associated with their implementation. Integration of such energy sources requires revisiting the grid structure and operation paradigm. The most relevant difficulty is that such a transformation must be carried out while keeping the system operational.
In a conventional power system, synchronous machines are widely used as traditional electricity generators. These rotating machines store kinetic energy in their rotors. Rotor kinetic energy can be released or captured to compensate for load or generation disturbances, thus keeping the system's frequency constant (inertia characteristic). Large-scale renewable integration reduces the grid's inertia significantly since they interface to the network through inertia-less power converters.
Several control strategies have been proposed to enhance the inertia capability of renewable generation units such as solar photovoltaic plants or wind turbines. However, this control loop does not guarantee frequency restoration to the nominal value. For this reason, it is critical to consider a secondary control loop to drive the frequency back to the desired steady-state operating condition.
This work considers a system with high penetration of solar photovoltaic and wind energy. The main objective is to evaluate a decentralized linear controller's performance for a secondary control loop with the active contribution of renewable units. The resulting controller is benchmarked against conventional alternatives such as a linear quadratic regulator. The document focuses mostly on designing a secondary load frequency controller under the active disturbance rejection paradigm using a linear technique such as an extended-state observer. | |
dc.description.abstract | Las energías renovables no convencionales suponen un gran desafío para los sistemas eléctricos dadas las dificultades técnicas que conlleva su implementación en la red existente. La incorporación de estas fuentes de generación obliga a una transformación total de la red y a un cambio de paradigma en su operación. La dificultad más grande, empero, es que dicho proceso debe llevarse a cabo sin interrumpir el funcionamiento del sistema.
En una red eléctrica tradicional, los generadores sincrónicos se utilizan ampliamiente como unidades convencionales de generación de electricidad. Estas máquinas rotativas están en la capacidad de almacenar energía cinética en sus rotores, la cual pueden entregar al sistema para recobrar el balance que conduzca la frecuencia a un valor estable luego de la ocurrencia de una perturbación de carga o generación. Esto se conoce como capacidad de inercia. La integración de renovables a gran escala disminuye la capacidad de inercia de la red, ya que gran parte de las unidades de generación eólica y solar fotovoltaica se conectan al sistema mediante convertidores de electrónica de potencia.
En la actualidad se han desarrollado distintas estrategias de control para proveer de capacidad de inercia a los generadores eólicos y solares fotovoltaicos. No obstante, este lazo por sí mismo no garantiza que la frecuencia de operación del sistema vaya a retornar a su valor nominal, ya que solo se encarga de estabilizar el valor de la frecuencia después de una perturbación. Por ello, es importante la consideración de un lazo de control secundario capaz de reestablecer la frecuencia a su valor nominal.
Por todo lo anterior, este trabajo se enmarca en un escenario de alta penetración de generación
eólica y solar fotovoltaica en un sistema de potencia. El principal propósito de esta investigación es evaluar el desempeño de un controlador descentralizado lineal en un lazo secundario de frecuencia con la participación de generadores eólicos y solar fotovoltaicos en comparación con una arquitectura basada en compensadores tradicionales como el LQR. El documento se centra en el diseño de un controlador secundario de frecuencia bajo el paradigma del rechazo activo de perturbaciones utilizando una técnica lineal como el observador de estado extendido. | |
dc.language | eng | |
dc.publisher | Universidad Nacional de Colombia | |
dc.publisher | Bogotá - Ingeniería - Maestría en Ingeniería - Automatización Industrial | |
dc.publisher | Departamento de Ingeniería Eléctrica y Electrónica | |
dc.publisher | Facultad de Ingeniería | |
dc.publisher | Bogotá | |
dc.publisher | Universidad Nacional de Colombia - Sede Bogotá | |
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dc.rights | Atribución-NoComercial-SinDerivadas 4.0 Internacional | |
dc.rights | http://creativecommons.org/licenses/by-nc-nd/4.0/ | |
dc.rights | info:eu-repo/semantics/openAccess | |
dc.title | Decentralized load frequency control for a power system with high penetration of wind and solar photovoltaic generation | |
dc.type | Trabajo de grado - Maestría | |