Open-Switch Fault-Tolerant Operation of T-Type Active Neutral-Point-Clamped Converter Using Level-Shifted PWM

Xu, Shuai; Sun, Zhenyao; Yao, Chunxing; Liu, Kang; Ma, Guangtong

doi:10.1109/tcsii.2021.3061483

Cited by 9 publications

(5 citation statements)

References 16 publications

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“…Figure. 15 shows the THD change trend of the output voltage of the energy storage system when NP increased from 1 to 8 in the experiment. It can be seen that when NP≥4, the THD of uox is unchanged, and increasing NP does not make much sense.…”

Section: Experimental Validationmentioning

confidence: 99%

Novel Hybrid Modulation Method for Modular Multilevel Converter Based Energy Storage System

2023

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This paper focuses on introducing a modular cascaded battery energy storage system and establishing a mathematical model for both the AC and DC sides of the energy storage system. Based on this, a corresponding control strategy is proposed. To achieve a specific trade-off between switching times and output harmonics, a new hybrid modulation strategy (NHPWM) is proposed that combines the characteristics of NLM and CPS-PWM commonly used in traditional modular cascaded topologies. With this hybrid modulation strategy, the modulation of each sub-module can be flexibly configured, allowing the system to coordinate device loss and output harmonic characteristics in real time according to system requirements. Additionally, this paper proposes a calculation method based on the theory of double Fourier series expansion to derive the analytical solution of the NHPWM harmonic distribution, providing a theoretical basis for submodule modulation mode configuration. Finally, the correctness and effectiveness of the modulation strategy and theoretical calculation were verified by simulation and experiment. The proposed method in this paper has demonstrated clear advantages over traditional HPWM and CPS-PWM in terms of harmonics and efficiency, as shown by the experimental results.INDEX TERMS modular multilevel converter (MMC), novel hybrid PWM modulation (NHPWM), nearest level modulation (NLM), carrier phase-shift PWM (CPS-PWM)

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Section: Experimental Validationmentioning

confidence: 99%

Novel Hybrid Modulation Method for Modular Multilevel Converter Based Energy Storage System

2023

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“…The capabilities of the capacitors voltage self-balance and ability to supply inductive loads are kept in the proposed fault-tolerant topology. This topology can be applied for short-circuit fault tolerance if fast fuses or circuit breakers are used to isolate the short-circuit switches [21]. It is important to point out that this fault-tolerant technique, which decreases four levels at most, can be outfit for extendable topologies.…”

Section: Type-b Faultmentioning

confidence: 99%

Extendable space-type switched-capacitor multilevel inverter with fault-tolerant capability

et al. 2022

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Low reliability is one of the main concerns in terms of multilevel inverters (MLI) due to the presence of a large number of switches and capacitors. Therefore, the faulttolerant operation of MLIs has recently gained a great deal of attention. An extendable space-type switched-capacitor multilevel inverter topology with fault-tolerant characteristics is proposed in this paper. The proposed inverter employs a single direct-current voltage source and three capacitors to output staircase voltage levels with low distortion. The proposed topology is capable of tolerating open-circuit faults due to the separated charging paths of the inverter. Under pre-fault and post-fault operations, it preserves capacitor voltage balancing, voltage boost capability, as well as the ability to supply inductive loads. Furthermore, the voltage stresses of the switches and the voltage ripple of the capacitors are decreased or remain under post-fault operations. The proposed topology has been validated with a laboratory prototype in both dynamic and steady-state operations.

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“…. ), motor drive and renewable energy [1]. These converters have many advantages: high power capacity, better power quality (reduced total harmonic distortion THD for AC voltage and current), reduced blocking voltage requirement for the power switches and fault-tolerant capability [2], [3].…”

Section: Introductionmentioning

confidence: 99%

“…In [11], Lee et al have proposed a fault tolerant control based on the neutral-point voltage balance for the switch OCF, in a 3L-NPC converter and a T-type converter used in wind energy systems. In [1] a carrier-based fault-tolerant control strategy for a T-Type Active Neutral-Point-Clamped Converter (T-ANPC) in the case of typical OCF switch fault is proposed.…”

Section: Introductionmentioning

confidence: 99%

Fault detection and localization for T-Type Converter

Becker

Jamshidpour

Poure

et al. 2021

2021 IEEE International Conference on Environment and Electrical Engineering and 2021 IEEE Industrial and Commercial Power Syst

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In this paper, an Open-circuit switch fault diagnosis method for a five-level H-Bridge T-type converter is presented. The proposed fault detection method and the fault localization algorithm are based on the switching patterns and the converter output voltage level observation. The proposed fault diagnosis approach is capable to detect and localize an open circuit fault for all switches. The proposed approach is validated by simulations in Matlab Simulink and SimPowerSystem toolbox environments.

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Open-Switch Fault-Tolerant Operation of T-Type Active Neutral-Point-Clamped Converter Using Level-Shifted PWM

Cited by 9 publications

References 16 publications

Novel Hybrid Modulation Method for Modular Multilevel Converter Based Energy Storage System

Novel Hybrid Modulation Method for Modular Multilevel Converter Based Energy Storage System

Extendable space-type switched-capacitor multilevel inverter with fault-tolerant capability

Fault detection and localization for T-Type Converter

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