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Title:
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Three-phase isolated multi-modular converter in renewable energy distribution systems
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Author:
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Verdugo Retamal, Cristian Andrés; Candela García, José Ignacio; Blaabjerg, Frede; Rodríguez Cortés, Pedro
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Other authors:
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Elèctrica; Universitat Politècnica de Catalunya. SEER - Sistemes Elèctrics d'Energia Renovable |
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Abstract:
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Multilevel converters are widely used in medium and high voltage applications. Their high performance, power quality, efficiency and smaller filters make them interesting for renewable energy distribution systems. In utility- scale photovoltaic plants, these topologies could provide multiple benefits since they are able to connect string of photovoltaic panels to independent modules. However, high floating voltages caused by high number of modules limit multilevel converters in medium and high voltage applications, since all of them are not suitable to provide isolation to each module. To offer a solution, this paper presents a novel multi-modular converter that provides multiple isolated modules connected in series through low frequency transformers to operate at medium voltage levels. This topology is able to achieve the power balancing between the connected modules and independently adjust the dc voltage of each module by means of controlling a circulating current which flows through the arms. Furthermore, the topology implemented in photovoltaic renewable energy systems and the control strategy required to regulate the circulating and the output current are presented. The main principle behind this concept and the performance of the converter are evaluated and validated through simulation and experimental results. |
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Abstract:
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Peer Reviewed |
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Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria electrònica::Electrònica de potència::Convertidors de corrent elèctric
-Àrees temàtiques de la UPC::Energies::Energia solar fotovoltaica::Captadors solars
-Electric current converters
-Photovoltaic power systems
-cascaded transformer multilevel inverter
-high voltage systems
-isolated multi-modular converter
-modular multilevel converter
-Convertidors de corrent elèctric
-Energia solar fotovoltaica |
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Rights:
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Document type:
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Article - Submitted version
Article |
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Published by:
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Institute of Electrical and Electronics Engineers (IEEE)
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