Comparative Assessment of Multi-Port MMCs for High-Power Applications

Li, Yuan; Kish, Gregory J.

doi:10.1109/access.2022.3152536

Cited by 10 publications

(3 citation statements)

References 33 publications

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“…However, these approaches also suffer from several limitations, such as the limitation on the number of RES inputs, number of phases and levels and the need for transformers for isolation, which result in bulky designs. More specifically, a family of multi-port modular multilevel converters is introduced in [35], interfacing one AC port with two DC ports with the help of low-frequency transformers. The reported topologies generate high voltage levels using either full-bridge or half-bridge cells.…”

Section: Introductionmentioning

confidence: 99%

Integrated Multiport DC-DC and Multilevel Converters for Multiple Renewable Energy Source Integration

Jiya,

Salem,

Van Khang

et al. 2023

IEEE Access

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methods for electrical energy conversion systems monitoring and diagnostics". The project benefits from a 993000 € grant from Iceland, Liechtenstein and Norway through the EEA Grants. The aim of the project is to provide the research in field of energy conversion systems and to develop artificial intelligence and virtual emulator-based prognostic and diagnostic methodologies for these systems. Project contract with the Research Council of Lithuania (LMTLT) No is S-BMT-21-5 (LT08-2-LMT-K-01-040).

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Section: Introductionmentioning

confidence: 99%

Integrated Multiport DC-DC and Multilevel Converters for Multiple Renewable Energy Source Integration

Jiya,

Salem,

Van Khang

et al. 2023

IEEE Access

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“…The multi-port converters can be designed as dc-dc, dc-ac, or ac-ac converters. The multi-port dc-dc converters can be also divided into isolated [98][99][100][101][102] and non-isolated converters [83,103,104]. The isolated multi-port converters could have complicated converter and transformer arrangements.…”

Section: Multi-port Convertersmentioning

confidence: 99%

“…Furthermore, the dc-dc interconnections are mostly based between lines of the same topology, e.g. interconnecting multiple AM lines with different voltage ratings [83,100,103]. Due to their complexity, these converters are not considered in this thesis.…”

Section: Multi-port Convertersmentioning

confidence: 99%

Dc-dc converters for HVDC heterogeneous interconnections

Gómez Acero

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(English) High voltage direct current (HVDC) technologies have been used for bulk power transmission over long distances since the 1950s. These technologies have proven to be the most cost-efficient compared to the high voltage alternate current (HVAC) for some applications such as offshore power transmission, connecting remote loads or generation, and the interconnection of non-synchronized grids. In recent years, the study of HVDC grids has been of interest in some research projects but, its development is still uncertain. The de grid can be planned beforehand or it can use the installed lines. But, from the installed HVDC projects, it can be identified different operating voltages, used technologies, and line topologies. There are two HVDC technologies: the line commutated converter (LCC), and the voltage source converter (\/SC). Four different line topologies are identified: asymmetric monopole, symmetric monopole, bipole, and rigid bipole. Developing a de grid interconnecting isolated lines with different characteristics cannot be possible without an intermediary device: the de-de converter. This thesis studies the de-de converters interconnecting HVDC lines with different characteristics. These converters can be seen as the equivalent of ac transformers in de applications because they are capable to adapt the voltage difference between two de systems. These converters are also capable to adapt the line topology and differenttechnologies. The power electronics required for these de-de converters provide increased control flexibility used to supply additional ancillary services that the classical transformers cannot furnish. Three de-de converter topologies are modeled and simulated for the interconnection between a bipole and a symmetric monopole. The front-to-front modular multi-level converter (F2F-MMC) is chosen as the reference because it represents state of-the-art technology. The second converter is the de-de MMC (de-MMC) because of the topological similarityto the MMC. Then, a third converter is proposed and studied as a result of this thesis, the asymmetric de-de converter (ADCC). A set of simulations are performed for multiple operating points and faults scenarios. Then, the converters are compared quantitatively and qualitatively. The results and analysis are used to conclude and bring some perspectives for future works. (Español) as transmision en corriente continua a alta tension (HVDC-por sus siglas en ingles) se han utilizado para la transmision de grandes cantidades de energfa a largas distancias desde la decada de 1950. Estas tecnologfas han demostrado ser las mas rentables en comparacion con la corriente alterna de alta tension (HVAC) para algunas aplicaciones como la transmision de energfa en alta mar, la conexion de cargas o generacion remotas y la interconexion de redes no sincronizadas. En los ultimos aiios, el estudio de las redes HVDC ha sido de interes en algunos proyectos de investigacion, pero su desarrollo aun es incierto. La red de de se puede planificar de antemano o puede utilizar las lfneas instaladas. Pero, a partir de los proyectos HVDC instalados, se pueden identificar diferentes voltajes de operacion, tecnologfas utilizadas ytopologfas de lfnea. Hay dos tecnologfas HVDC: el convertidor de lfnea conmutada (LCC) y el convertidor de fuente de voltaje (VSC). Se identifican cuatro topologfas de lfnea diferentes: monopolo asimetrico, monopolo simetrico, bipolo y bipolo rfgido. El desarrollo de una red de de que interconecte lfneas aisladas de diferentes caracterfsticas no es posible sin un dispositivo intermediario: el convertidor de-de. Esta tesis estudia los convertidores de-de interconectando lfneas HVDC de diferentes caracteristicas. Estos convertidores pueden verse como el equivalente de los transform adores de ac en aplicaciones de de porque son capaces de adaptar la diferencia de tension entre dos sistemas de de. Pero, estos convertidores tambien son capaces de adaptar la topologia de linea ydiferentes tecnologias. La electronica de potencia necesaria para estos convertidores de-de proporciona una mayor flexibilidad de control que se utiliza para proporcionar servicios auxiliares adicionales que los transform adores clasicos no pueden proporcionar. Se modelan y simulan tres topologias de convertidores de-de para la interconexion entre un bipolo y un monopolo simetrico. El convertidor multinivel modular de frente a frente (F2F-MMC) se elige como referencia porque representa tecnologia de punta. El segundo convertidor es el MMC de-de (de-MMC) debido a la similitud topologica con el MMC. Luego, se propone y estudia un tercer convertidor como resultado de esta tesis, el convertidor asimetrico de-de (ADCC). Se realiza un conjunto de simulaciones para multiples puntos de operacion yescenarios de fallas. Luego, los convertidores se comparan cuantitativa y cualitativamente. Los resultados y el analisis se utilizan para concluir y aportar algunas perspectivas para trabajos futuros.

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