A Distributed Control Architecture for Cascaded H-Bridge Converter

Xu, Bei; Tu, Hao; Du, Yuhua; Yu, Hui; Liang, Hui; Lukic, Srdjan

doi:10.1109/apec.2019.8722268

Cited by 13 publications

(11 citation statements)

References 18 publications

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“…According to the first research direction, the decentralized control is characterized by a hierarchical architecture that has two control levels, such as primary-secondary controller [9,11] and master-slave or central-local controller [12][13][14][15][16][17][18][19], and the information exchange between these levels is conducted by communication links. The system level controllers, namely secondary/master/central, are responsible for general information management and for performing tasks such as voltage balance, current balance, and power exchange.…”

Section: Introductionmentioning

confidence: 99%

A Fast, Decentralized, Self-Aligned Carrier Method for Multicellular Converters

et al. 2020

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This paper proposes a fast, decentralized method for self-aligning the carriers of a multiphase/multilevel converter operating on the basis of phase-shifted pulse width modulation or level-shifted pulse width modulation. In the proposed method, each cell of the converter synchronizes and updates simultaneously its own carrier angle or carrier level based on the information shared with its neighboring cell, such as its angle/level, its index number, and the total number of activated cells of the converter. Different from the conventional decentralized method (with basic and modified updating rules), which requires some conditions in terms of cell number and initial carrier angles to start up and operate properly, the proposed method can be applied to the system with any number of cells and does not require special conditions of initial carrier angles. Further, while the conventional method needs an iteration process to adjust the inter-carrier phase-shifts and can be applied only to a multiphase converter which uses phase-shifted pulse width modulation, the proposed method offers an accurate and fast alignment of phases (for phase-shifted pulse width modulation) or levels (for level-shifted pulse width modulation) and thus can be applied to both multiphase and multilevel converter types. The simulations and the experimental results are presented in detail to show the validity and the effectiveness of the proposed methods. Further, thorough simulations on multiphase converters with different number of cells also show that the proposed method is much faster than the conventional method in both configuration and reconfiguration processes, especially in case the system has a large number of cells.

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Section: Introductionmentioning

confidence: 99%

A Fast, Decentralized, Self-Aligned Carrier Method for Multicellular Converters

et al. 2020

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“…The centralized control method can accurately monitor the operating status of the systems and it is easier to realize system control and synchronized modulation [7], [8]. However, the centralized control requires each cascaded power module to communicate with the central controller through a high-speed communication link, which increases the computational and communication burden of the central controller, reduces the modularity and scalability of a PET system [9]. Therefore, the distributed control is more suitable for the PET system with a large number of cascaded power modules.…”

Section: Introductionmentioning

confidence: 99%

“…The slave controller also controls the isolation DC-DC converter in each cascaded power module [10]. A hierarchical distributed control architecture for the CHB converters is proposed in [9]. Current tracking is performed through the master control, and the slave control based on consensus algorithm is adopted in order to achieve power balance among modules.…”

Section: Introductionmentioning

confidence: 99%

A distributed feedforward control method for power electronic transformers

Zhao

et al. 2020

Trans. Electr. Mach. Syst.

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“…The main issue of generating a reference to each cell-variable is that if a disturbance in any parameters is produced, or if a cell is inserted or removed, the references of each CV could have to be recalculated as happen in the Flying-Capacitor Multilevel Converter when the input voltage changes. In [7,10], another strategy for balancing of cell-variables is proposed for CEMI, comparing the local cell variable to the neighbors. These techniques are based on a drop controller, emulating the converter to a Thevenin circuit, in which the output impedance of each FB is compared with its neighbors.…”

Section: Control Techniques For Multilevel Convertersmentioning

confidence: 99%

“…In the case of Multiphase Buck, balancing the leg current produces a suitable distribution of the output current of the system [6]. For the case of CFBMC, it is possible to balance the output voltages of each FB for maintaining equalized the power delivered by each FB [7][8][9][10], or if the sources are batteries, to balance the input current of each FB to maintain well balanced the charging or discharging of the batteries. Furthermore, it is possible to balance the State Of Charge (SOC) of the batteries.…”

Section: Introductionmentioning

confidence: 99%

Estrategias descentralizadas y adaptativas para la eliminación selectiva de armónicos en el control de convertidores multinivel

Pino¹

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Este trabajo consta de dos secciones relevantes. La primera sección propone un control descentralizado para los convertidores multi-nivel. Para el diseño del mismo se plantea un modelo generalizado de los convertidores multi-celulares, basándose en los modelos de los convertidores de capacitores flotantes, convertidor multi-nivel de puentes H en cascada y convertidor de multi-phase Buck. Con ese modelo generalizado se plantea el control que consta de 3 partes: Un sistema de derivación, un control de balance de las celdas de los convertidores y un regulador de la variable de salida. El trabajo presenta resultados de simulación y experimentación con los convertidores de capacitores flotantes y de puentes H en cascada, perturbando el voltaje de entrada, insertando una celda y perturbando la resistencia de carga, obteniéndose resultados favorables y en concordancia entre la teoría, la simulación y la experimentación. La segunda parte de la tesis consiste en un controlador para un inversor multi-nivel simétrico de puentes H en cascada de 9 niveles con la modulación de Eliminación Selectiva de Armónicos. Este controlador regula la componente fundamental y elimina las armónicas 3,5 y 7 cuando existen perturbaciones en las fuentes de entrada o cambios en la resistencia de carga. Este controlador es validado tanto en simulación como en experimentación con dos tests, insertando una carga de 200 W y cambiando una fuente de entrada. obteniéndose resultados favorables y en concordancia entre simulación y experimentación. Finalmente, conclusiones y trabajos futuros son detallados.

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A Distributed Control Architecture for Cascaded H-Bridge Converter

Cited by 13 publications

References 18 publications

A Fast, Decentralized, Self-Aligned Carrier Method for Multicellular Converters

A Fast, Decentralized, Self-Aligned Carrier Method for Multicellular Converters

A distributed feedforward control method for power electronic transformers

Estrategias descentralizadas y adaptativas para la eliminación selectiva de armónicos en el control de convertidores multinivel

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