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Decentralized primary control of MTDC networks with energy storage and distributed generation
Gavriluta, Catalin; Candela García, José Ignacio; Citro, Costantino; Rocabert Delgado, Joan; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro
Universitat Politècnica de Catalunya. Departament d'Enginyeria Elèctrica; Universitat Politècnica de Catalunya. SEER - Sistemes Elèctrics d'Energia Renovable
Multiterminal dc networks are drawing a lot of interest lately in applications related to distributed generation, particularly in those that also integrate energy storage (ES). A few approaches for controlling the operation of such systems have been proposed in the literature; however, the existing structures can be significantly enhanced. This paper proposes an improved primary control layer, based on custom droop characteristics obtained by combining concepts of droop and dc-bus signaling control. This approach is designed to be generic and takes into account the various operating states of the network. Five operating bands, similar to the operating states of the ac grids, as well as various droop characteristics for different elements connected to the dc network, are defined. For the ES, the state of charge is taken into account at the primary control level and included in the droop characteristic, creating a two-variable droop surface. The proposed control strategy is validated through simulation and experimental results obtained from a case study that involves amicro dc network composed of a photovoltaic generator, a lead-acid battery, and a connection point to the ac grid.
Peer Reviewed
Àrees temàtiques de la UPC::Energies::Energia elèctrica::Automatització i control de l’energia elèctrica
Energy storage
Photovoltaic power generation
Distributed generation of electric power
Photovoltaic power systems
Decentralized control
distributed power generation
energy storage
photovoltaic systems
MULTITERMINAL HVDC NETWORKS
OFFSHORE WIND FARMS
DC VOLTAGE CONTROL
CONTROL STRATEGY
POWER-SYSTEM
BUS
Sistemes de potencia fotovoltaica
Energia -- Emmagatzematge
Sistemes de distribució d'energia elèctrica
Generadors de potència fotovoltaica
info:eu-repo/semantics/publishedVersion
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