The diode-clamped half-bridge MMC structure with internal spontaneous capacitor voltage parallel-balancing behaviors

Xu, Jianzhong; Feng, Moke; Liu, Huan; Li, Shuai; Xiong, Xinhong; Zhao, Chengyong

doi:10.1016/j.ijepes.2018.02.017

Cited by 17 publications

(7 citation statements)

References 16 publications

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“…In Zhou et al (2018), each MMC submodule has a half-bridge structure requiring two switches and two diodes. With the structure proposed in Zhou et al (2018), eight switch-diode sets, two inductors, and four capacitors are required (Xu et al, 2018). However, it is possible to reduce the number of required modules to half, if the switching technique in Hu and Jiang (2014) is utilized.…”

Section: Topologies Of Five-level Front-end Convertersmentioning

confidence: 99%

“…Another advantage of these MMCs is better fault tolerance. There are other MMC topologies that focus on additional features such as sensorless balancing and/or parallel connection (Xu et al, 2018;Jin et al, 2019;Li et al, 2019;Xu et al, 2019). As an example, an extra half-bridge is introduced in Goetz et al (2015Goetz et al ( , 2016 that brings about the capability to connect neighboring modules in parallel.…”

Section: Topologies Of Five-level Front-end Convertersmentioning

confidence: 99%

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Review of Five-Level Front-End Converters for Renewable-Energy Applications

et al. 2020

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Section: Topologies Of Five-level Front-end Convertersmentioning

confidence: 99%

Section: Topologies Of Five-level Front-end Convertersmentioning

confidence: 99%

Review of Five-Level Front-End Converters for Renewable-Energy Applications

et al. 2020

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“…[8][9][10][11] After the invention of MMC, different methods were presented to control it, each using a different structure, sensors, and algorithm to achieve the proper output power. [12][13][14][15][16] Gradually, various studies have presented estimation methods for determining the voltage of capacitors in each processing cycle by using the previous cycle's data of switching signals and capacitor voltages, thereby reducing the number of required sensors and the hardware complexity of the system. 17,18 In Yin et al and Hu et al, 19,20 the current sensors are eliminated, but all voltage sensors are present on the sub-modules (Subs).…”

Section: Introductionmentioning

confidence: 99%

An improved method to sub‐module voltage balancing in modular multilevel converters with two voltage sensors

Hashkavayi

Barakati

Torabi

et al. 2023

Circuit Theory & Apps

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Summary The modular multilevel converter (MMC) is an innovative structure that has expanded the usage of multilevel converters (MLCs) in the electrical industry. Since the MMC initially required a large number of sensors to manage the capacitor voltages, various studies have been done to reduce their number to improve the converter's reliability and reduce construction costs. In this paper's proposed method, merely two voltage sensors are used to balance the converter's capacitor voltages, and voltages are estimated using the exponentially weighted recursive least square (RLS) method in each sampling time. Also, the estimated voltages are sorted according to the capacitor current sign determined by the voltage sensors, and the current sensors are entirely eliminated. Furthermore, three cases for compensating the capacitor estimated voltages are presented, and the last case proposes the sub‐module force algorithm (SFA) for system protection. The efficacy of the proposed method has been assessed via simulation and experimental implementations.

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“…The modular structure of DCMI with internal spontaneous capacitor voltage parallel‐balancing behaviors have been proposed in Ref. 14. Ref.…”

Section: Introductionmentioning

confidence: 99%

Three‐phase cascaded neutral‐point‐clamped multilevel inverter

Qanbari

Nazarpour

2020

Int Trans Electr Energ Syst

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Summary This paper presents cascaded topology of three‐phase neutral‐point‐clamped converters (NPCC)s. Two or more NPCCs are cascaded in their AC sides through transformers. This multilevel inverter (MLI) is a transformer‐based single‐source inverter with trinary asymmetry. Compared with conventional and advanced diode‐clamped multilevel inverters, the proposed MLI achieves more levels on output voltage. From cost, number of components, volume, complexity and efficiency aspects, the proposed inverter is an optimized and advanced inverter. An individual space vector modulation (SVM) method has been developed for voltage control of the inverter. The neutral‐point voltage of the inverter is balanced conveniently by the SVM method. The proposed inverter is suitable for constant‐frequency applications. Simulation and experimental results of a 17‐kVA prototype verify the efficiency of the proposed arrangement.

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The diode-clamped half-bridge MMC structure with internal spontaneous capacitor voltage parallel-balancing behaviors

Cited by 17 publications

References 16 publications

Review of Five-Level Front-End Converters for Renewable-Energy Applications

Review of Five-Level Front-End Converters for Renewable-Energy Applications

An improved method to sub‐module voltage balancing in modular multilevel converters with two voltage sensors

Three‐phase cascaded neutral‐point‐clamped multilevel inverter

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