Decentralized Control for Balancing the Cell Voltages of a High Conversion Ratio Flying Capacitor Multilevel Converter

Vivert, Miguel; Cousineau, Marc; Díez, Rafael; Ladoux, Philippe; Fabre, Joseph; Mannes, Miguel; Patiño, Diego

doi:10.1109/jestie.2021.3115958

Cited by 6 publications

(10 citation statements)

References 26 publications

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“…In contrast, MCCs bring some complex subjects that need to be analyzed, such as the control of the cells that guarantees an equilibrium of the power delivered by each cell or the secure operation of the switches, avoiding overvoltage or overcurrent. For instance, in FCMC the capacitor voltages are the variables to balance [3,4,21], also improving the output voltage ripple. In the Multiphase Buck Converter, the sharing must be ensured in the output current of each leg [16].…”

Section: Introductionmentioning

confidence: 99%

“…The modularity of MCCs also offers the opportunity to propose fault-tolerant solutions. Here, one challenge is to insert or remove cells during operation [3,15,21,23], which additionally provides the possibility to increase the power of the system without interruption. There exist many controllers that satisfy all these specifications.…”

Section: Introductionmentioning

confidence: 99%

“…There exist many controllers that satisfy all these specifications. In [3,21], a control structure is proposed for an FCMC, which balances the capacitor voltages, regulates the output current and allows a cell insertion/removal ability, obtaining interesting results.…”

Section: Introductionmentioning

confidence: 99%

“…The present article applies to the CFBMC, proposing a decentralized controller based on [3,21] that differs from most of the works found in the literature, where the balancing is achieved by means of a controller that finds the error comparing the control variable of one cell with the average of all the other cell variables. This task needs to be assumed by a supervisor in a centralized way, either for the SOC [26,27], the DC link voltage [28] or the output power [29].…”

Section: Introductionmentioning

confidence: 99%

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Decentralized Control for the Cell Power Balancing of a Cascaded Full-Bridge Multilevel Converter

et al. 2023

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This article presents a decentralized control technique applied to a Cascaded Full-Bridge Multilevel Converter (CFBMC) to balance the amount of power provided by its independent cells connected in series. It is based on the use of elementary modular controllers, associated with each converter cell, communicating with their close neighbors to obtain the appropriate power balancing. A complete theoretical study of the system is provided in terms of modal responses, feedback loop bandwidth and stability criteria and the design method of the correctors is explained as well. Each modular controller can be dynamically removed or added to allow reconfiguration of the number of converter cells during operation for functional safety purposes. This method is illustrated with a five-cell CFBMC, studied both with simulations and experimental tests. The response of the system to load transients and cell voltage disturbances demonstrates the robustness of the proposed control method. Thanks to its modularity, the number of voltage levels of the converter can be easily increased by inserting new cells in series without adding complexity to the control part.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Decentralized Control for the Cell Power Balancing of a Cascaded Full-Bridge Multilevel Converter

et al. 2023

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“…This process might disrupt the operation of power converter. Recent study has shown that as compared to centralized control, decentralized control of power converters constructed in the form of converter cells or modules, can reduce central controller computation and increase operational flexibility [21]- [24]. For the MMCs, the use of self-aligned carriers in [25] allows for the removal or replacement of malfunctioning SMs without disturbing main control while capacitor voltage balance is achieved.…”

mentioning

confidence: 99%

Self-aligned hybrid carrier-based PWM for modular multilevel converters

Pham

Dzung

2023

IJPEDS

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The self-aligned hybrid carrier-based pulse-width modulation (PWM) for modular multilevel converters (MMC) based on decentralized control is proposed in this paper. It is based on parallel cells in a submodule (SM) using self-aligned hybrid carrier-based PWM, which combines the concept of level-shifted carrier-based PWM (LSC-PWM) and phase-shifted carrier-based PWM (PSC-PWM) methods. By implementing a decentralized control system digitally, hybrid carriers align themselves. Each SM interacts with the other SMs and each parallel cell in an SM communicates with the other cells to generate hybrid carriers. The proposed control strategy makes advantage of the redundancy idea by adding or removing a cell in the case of cell malfunction and system reconfiguration. A current balancing method is incorporated into the decentralized control system to ensure current balance among parallel cells in an SM. The simulation results illustrate the effectiveness of the presented control method in piecewise linear electrical circuit simulation (PLECS) software.

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A Seven Level Fault Tolerant Switched Capacitor Boost Inverter With a Single DC Source

Yarlagadda,

Verma,

Tariq

et al. 2023

IEEE Access

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A Fault-Tolerant Multi-Level Inverter (FT-MLI) is essential to ensure power supply continuity for crucial applications. At the same time, the cost and efficiency of MLI is also important for its successful use in the commercial market. The existing seven level FT-MLI topologies demand more than one input DC source, which increases the cost function. This article proposes a single DC source seven level FT-MLI topology with minimum number of switches (IGBT) to reduce the cost function. The proposed FT-MLI topology generates seven level output voltage with 1.5 times voltage boosting. In case of open or short circuit fault on any single or multi switch, the topology continues to operate with five level output voltage using reserved switches. It consists of eight active switches, two diodes, two capacitors, six thermal fuses, and three reserved switches. In comparison to the existing seven level fault tolerant (open circuit and short circuit fault) topologies, the suggested structure requires minimum number of component count. The efficiency and power losses of the proposed structure are analyzed theoretically. The proposed topology has an efficiency of 96 % at an output power of 600 W under healthy condition and 97% at an output power of 272 W under post fault condition. The level shift pulse width modulation approach is used to generate required triggering pulse for the switch during pre-fault and post-fault. The proposed topology is simulated in the MATLAB/Simulink platform and experimentally verified using dSPACE 1104. The response of the output voltage and current during the transition from pre-fault to post-post fault for each switch fault are presented.

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Decentralized Control for Balancing the Cell Voltages of a High Conversion Ratio Flying Capacitor Multilevel Converter

Cited by 6 publications

References 26 publications

Decentralized Control for the Cell Power Balancing of a Cascaded Full-Bridge Multilevel Converter

Decentralized Control for the Cell Power Balancing of a Cascaded Full-Bridge Multilevel Converter

Self-aligned hybrid carrier-based PWM for modular multilevel converters

A Seven Level Fault Tolerant Switched Capacitor Boost Inverter With a Single DC Source

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