Adaptive droop for control of multiterminal DC bus integrating energy storage
Multiterminal dc (MTDC) systems are drawing a lot of interest lately in applications related to distributed generation, especially in those that integrate wind or photovoltaic (PV) generation with energy storage (ES). Several approaches for controlling the operation of such systems have been propose...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2015 |
| 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:2117/27092 |
| Acceso en línea: | https://hdl.handle.net/2117/27092 https://dx.doi.org/10.1109/TPWRD.2014.2352396 |
| Access Level: | acceso abierto |
| Palabra clave: | Distributed generation of electric power Energy storage Electric power distribution--Direct current. Distributed generation droop control energy storage MTDC systems parallel connection of converters PRIMARY FREQUENCY CONTROL OFFSHORE WIND FARMS POWER-SYSTEM VOLTAGE CONTROL STABILITY ANALYSIS CONTROL STRATEGY MTDC GRIDS TRANSMISSION PROTECTION LOCATION Energia elèctrica -- Distribució Energia -- Emmagatzematge Convertidors continu-continu Àrees temàtiques de la UPC::Energies::Energia elèctrica::Automatització i control de l’energia elèctrica Àrees temàtiques de la UPC::Enginyeria electrònica::Electrònica de potència::Convertidors de corrent elèctric |
| Sumario: | Multiterminal dc (MTDC) systems are drawing a lot of interest lately in applications related to distributed generation, especially in those that integrate wind or photovoltaic (PV) generation with energy storage (ES). Several approaches for controlling the operation of such systems have been proposed in the literature; however, the existing structures are mainly application specific and, thus, can be still improved in order to provide a more generic approach. This paper proposes an improved primary control layer for an MTDC system. The concept is based on the combination of a droop control method and dc bus signaling in order to provide a more generic and flexible solution. In this paper, different droop characteristics are proposed for the various elements connected to the dc bus. All of them are specifically tailored around five operation bands, which depend on the dc bus voltage level. Special attention is paid to the integration of ES: the state of charge (SoC) is considered at the primary control level, yielding a surface characteristic that depends on the SoC and the dc bus voltage. The scaling of the system has been analyzed together with the proposed control strategy and the overall operation has been validated through simulations by considering a 100 kW PV system with energy storage. Experimental results were obtained on a scaled laboratory prototype rated at 10 kW. |
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