A Novel Modular Multilevel Converter Based on Interleaved Half-Bridge Submodules

Viatkin, Aleksandr; Ricco, Mattia; Mandrioli, Riccardo; Kerekes, Tamás; Teodorescu, Remus; Grandi, Gabriele

doi:10.1109/tie.2022.3146516

Cited by 17 publications

(11 citation statements)

References 29 publications

(39 reference statements)

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“…In this paper, the MMCs with parallel cells in SM are considered. [16]. The output voltage of SM (𝑣 𝑠𝑚 ) is the voltage between the common point of the leg currents and the below side of the capacitor.…”

Section: Mathematical Model and Operation Of MMCmentioning

confidence: 99%

“…In this topology, each SM is constructed by several parallel half-bridge legs (or called . This structure not only allows the total current to be shared across cells to increase quality output [16], but it also ensures the redundancy concept. For that reason, an appropriate modulation method is required to exploit the advantages of this converter.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Mathematical Model and Operation Of MMCmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Pham

Dzung

2023

IJPEDS

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“…In such an arrangement, the Modular Multilevel Converters with Interleaved half-bridge Sub-Modules (ISM-MMC) demonstrates equal or superior performance (current rating scalability ease, enhanced quality of generated ac voltage waveforms, efficiency, etc.) than classical MMCs, considering identical power ratings and power switch count [9]. Due to its advantages, ISM-MMC is especially attractive in high-power, low/medium-voltage applications where classical MMC structures have limited usage due to its only one degree of freedom, namely voltage scalability.…”

Section: Introductionmentioning

confidence: 99%

“…Corresponding author: Riccardo Mandrioli, +39 05120 93566. parallel legs happens in a time shifted manner. In addition to that, circuit nonlinearities (differences among equivalent branch resistances), unequal dead-times, upstream control actions and many other factors may lead to the instantaneous current imbalance of the fundamental components between the interleaved legs [8], [9]. A uniform distribution of the total arms current among the parallel legs has to be ensured to avoid excessive converter losses, thermal stress and saturation of the inductors while ensuring optimal capacity utilization of the SM half-bridges.…”

Section: Introductionmentioning

confidence: 99%

Sensorless Current Balancing Control for Interleaved Half-Bridge Submodules in Modular Multilevel Converters

Viatkin

Ricco

Mandrioli

et al. 2023

IEEE Trans. Ind. Electron.

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A new state observer-based current balancing method for Modular Multilevel Converters with Interleaved half-bridge Sub-Modules (ISM-MMC) is presented in this paper. The developed observer allows estimating currents through interleaved half-bridge legs in each submodule of ISM-MMC basing only on arm current and submodule's capacitor voltage measurements. Then, the interleaved current balancing control uses the estimated currents to reduce the interleaved currents imbalance caused by upstream control actions. This technique minimizes the number of required current sensors in ISM-MMC, thereby reducing the converter's cost, weight, and volume. Capabilities of the proposed sensorless interleaved currents balancing control has been tested against standard parameter tolerances of the composing passive elements. In addition to that, a novel capacitor voltage balancing strategy for MMCs is developed. The new algorithm contains main advantages of the classical sorting-based capacitor voltage balancing methods while provides an opportunity to decouple two balancing tasks of ISM-MMC, namely capacitor voltage and interleaved legs current balancing. The feasibility of the proposed methods is verified by extensive simulation and experimental tests on a laboratory prototype by the corresponding system response under the output characteristics variation and interleaved current control perturbation.

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“…The modular multilevel converter (MMC) technology provides high efficiency, dynamic performance, and low harmonic distortion, which contribute to power quality and grid stability [1][2][3][4]. With its modular design, the MMC offers scalability and easy maintenance, making it highly applicable in high-voltage direct current, flexible ac transmission systems, electric vehicle charging, energy storage, and railway power supply [5][6][7][8][9][10]. However, the modular architecture depends on sub-module (SM) balancing control which is one of the most reported concerns of the MMC.…”

Section: Introductionmentioning

confidence: 99%

A Novel Voltage Sensorless Estimation Method for Modular Multilevel Converters with a Model Predictive Control Strategy

Liao,

Jin,

You

et al. 2023

Energies

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This paper proposes a novel voltage estimation scheme for the modular multilevel converter (MMC) based on model predictive control (MPC). The developed strategy is presented by combining a disturbance observer (DOB) with an adaptive neural network (ANN) for voltage estimation in the MMC. Firstly, the ac-side and dc bus voltages are estimated as the disturbance items of the DOB which acts as the cost function during each control cycle and ensures the minimal computational cost. Then, the submodule (SM) capacitor voltage estimation is achieved based on the ANN with the estimated ac-side and dc bus voltages. The proposed method requires only one current sensor per arm and has a simple structure with three weights to be adjusted. Comprehensive simulation studies and experiments are presented to demonstrate its effectiveness and feasibility. The results indicate that the proposed method has a high accuracy, a fast dynamic response, and no effects on the original MPC performance.

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A Novel Modular Multilevel Converter Based on Interleaved Half-Bridge Submodules

Cited by 17 publications

References 29 publications

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

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

Sensorless Current Balancing Control for Interleaved Half-Bridge Submodules in Modular Multilevel Converters

A Novel Voltage Sensorless Estimation Method for Modular Multilevel Converters with a Model Predictive Control Strategy

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