A modulation reconfiguration based fault-tolerant control scheme for modular multilevel converters

Shen, Ke; Xiao, Bailu; Mashino, Jun; Tolbert, Leon M.; Wang, Jianze; Cai, X.; Ji, Yanchao

doi:10.1109/apec.2013.6520766

Cited by 41 publications

(22 citation statements)

References 15 publications

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“…24ω I jz cos(4ωt + 2ϕ j + +θ jz ) (12) where ∆u jp_cap Σ and ∆u jl_cap Σ are the AC components of the total SMs output voltage in the upper arm and the lower arm, respectively. To facilitate the writing and expression, f 1 − f 4 are defined to replace the different components in ∆u jp_cap Σ and g 1 − g 4 are defined to represent the different components in ∆u jl_cap Σ .…”

Section: )mentioning

confidence: 99%

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Characteristic Analysis and Fault-Tolerant Control of Circulating Current for Modular Multilevel Converters under Sub-Module Faults

Zhang

Yin

et al. 2017

Energies

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Abstract:A modular multilevel converter (MMC) is considered to be a promising topology for medium-or high-power applications. However, a significantly increased amount of sub-modules (SMs) in each arm also increase the risk of failures. Focusing on the fault-tolerant operation issue for the MMC under SM faults, the operation characteristics of MMC with different numbers of faulty SMs in the arms are analyzed and summarized in this paper. Based on the characteristics, a novel circulating current-suppressing (CCS) fault-tolerant control strategy comprised of a basic control unit (BCU) and virtual resistance compensation control unit (VRCCU) in two parts is proposed, which has three main features: (i) it can suppress the multi-different frequency components of the circulating current under different SM fault types simultaneously; (ii) it can help fast limiting of the transient fault current caused at the faulty SM bypassed moment; and (iii) it does not need extra communication systems to acquire the information of the number of faulty SMs. Moreover, by analyzing the stability performance of the proposed controller using the Root-Locus criterion, the election principle of the value of virtual resistance is revealed. Finally, the efficiency of the control strategy is confirmed with the simulation and experiment studies under different fault conditions.

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Section: )mentioning

confidence: 99%

“…Based on zero-sequence voltage injection technique, fault-tolerant control methods are proposed in [11,12]. They can ensure the converter line-to-line voltage balance output and retain the SM capacitor voltage unchanged after SM malfunction.…”

Section: Introductionmentioning

confidence: 99%

Characteristic Analysis and Fault-Tolerant Control of Circulating Current for Modular Multilevel Converters under Sub-Module Faults

Zhang

Yin

et al. 2017

Energies

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“…Among these, the modulation method is the key to determining the final performance of the MMC circuit and to affecting the charging and discharging of the module capacitor [5]. The studies relating to modulation can be generally divided into four types, namely, nearest voltage level (NVL) [6], look-up table [7], [8], carrier phase shifted pulse width modulation (CPSPWM) [9]- [11], and phase disposition pulse width modulation (PDPWM) [5], [12]. The NVL method is a widely used modulation approach for MMC circuits because of its simple executing process [6].…”

Section: Introductionmentioning

confidence: 99%

“…However, this method introduces another problem in terms of a heavy computational burden on the digital controller. Furthermore, PDPWM is also studied in the application of MMC modulation [5], [12]. The study in [12] demonstrates an approach utilizing carrier circular transposition every line cycle for balancing the capacitor voltage.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, PDPWM is also studied in the application of MMC modulation [5], [12]. The study in [12] demonstrates an approach utilizing carrier circular transposition every line cycle for balancing the capacitor voltage. The absorbed power of each module can be equally distributed during N line cycles (N is the number of modules in each arm), but the balance of the capacitor voltages cannot be achieved because of the different power losses and uncontrollable fluctuations.…”

Section: Introductionmentioning

confidence: 99%

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A PDPWM Based DC Capacitor Voltage Control Method for Modular Multilevel Converters

Du¹,

Liu²,

Li³

2015

Journal of Power Electronics

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This paper presents a control scheme with a focus on the combination of phase disposition pulse width modulation (PDPWM) and DC capacitor voltage control for a chopper-cell based modular multilevel converter (MMC) for the purpose of eliminating the time-consuming voltage sorting algorithm and complex voltage balancing regulators. In this paper, the convergence of the DC capacitor voltages within one arm is realized by charging the minimum voltage module and discharging the maximum voltage module during each switching cycle with the assistances of MAX/MIN capacitor voltage detection and PDPWM signals exchanging. The process of voltage balancing control introduces no extra switching commutation, which is helpful in reducing power loss and improving system efficiency. Additionally, the proposed control scheme also possess the merit of a simple executing procedure in application. Simulation and experimental results indicates that the MMC circuit together with the proposed method functions very well in balancing the DC capacitor voltage and improving system efficiency even under transient states.

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Fault‐TolerantConverter Design for Photovoltaic System

Malik

Haque

2022

Fault Analysis and Its Impact on Grid‐connected Photovoltaic Systems Performance

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A modulation reconfiguration based fault-tolerant control scheme for modular multilevel converters

Cited by 41 publications

References 15 publications

Characteristic Analysis and Fault-Tolerant Control of Circulating Current for Modular Multilevel Converters under Sub-Module Faults

Characteristic Analysis and Fault-Tolerant Control of Circulating Current for Modular Multilevel Converters under Sub-Module Faults

A PDPWM Based DC Capacitor Voltage Control Method for Modular Multilevel Converters

Fault‐TolerantConverter Design for Photovoltaic System

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