Balancing Control Schemes for Modular Multilevel Converters Using Virtual Loop Mapping With Fault Tolerance Capabilities

Mashino, Jun; Ji, Yu; Tian, Jie; Huang, Can; Lu, Xiaojun; Du, Xiaoze; Xie, Yunxiang; Hu, Qinran; Ma, Tao

doi:10.1109/tie.2015.2472356

Cited by 28 publications

(18 citation statements)

References 29 publications

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“…Positive and negative carrier waveforms are 180° phase shifted in POD‐PWM, but consecutive carrier signals are 180° phase shifted with respect to each other in APOD‐PWM. In Mei et al, a new complementary phase disposition technique that uses sawtooth carriers instead of triangular carriers is proposed for MMCs. In the presented modulation, improved virtual loop mapping is used.…”

Section: Control Conceptmentioning

confidence: 99%

Recent contributions and future prospects of the modular multilevel converters: A comprehensive review

Kurtoğlu

Eroğlu

Arslan

et al. 2018

Int Trans Electr Energ Syst

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Summary The modular multilevel converters (MMCs) are frequently preferred for medium and high power energy conversion systems thanks to their modular structure and high quality output waveform. The remarkable studies related to the MMC have been carried out in recent years, which are mainly focused on its topology, control, or application. In this paper, MMC circuit topologies consisting of traditional submodule cells and new proposed configurations are introduced, and their control process, modulation techniques, and application areas are discussed in order to provide the readers the current state of the art of MMC technology. A wide part of this article is devoted to demonstrate the recent contributions arising in MMC studies. In this context, this paper not only outlines the circuit topology, control objectives, and applications of the MMC but also presents a comprehensive review, principally in terms of the latest developments of it. Ultimately, detailed proposals and new possible topics are provided to drive future expectations of MMC technology.

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Section: Control Conceptmentioning

confidence: 99%

Recent contributions and future prospects of the modular multilevel converters: A comprehensive review

Kurtoğlu

Eroğlu

Arslan

et al. 2018

Int Trans Electr Energ Syst

View full text Add to dashboard Cite

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“…However, the modulation index and phase angle of modulation reference should be recalculated based on a table look-up. For a simplified calculation, modulation reconfiguration techniques based on zero-sequence voltage injection are proposed [30][31][32]. They provide fault tolerant operation without the requirement for additional hardware and are easily implemented.…”

Section: Introductionmentioning

confidence: 99%

“…They provide fault tolerant operation without the requirement for additional hardware and are easily implemented. The outputs are balanced and the SM voltage in the faulty arm are controlled to a rated value by a modified modulation algorithm [30,31], the switching operations are different in unsymmetrical arms. However, the SMs failure only produced in one arm is considered in [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Fault-Tolerant Control Strategies and Capability without Redundant Sub-Modules in Modular Multilevel Converters

Yin

2019

Energies

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Sub-module (SM) faults in modular multilevel converters (MMCs) without redundancies result in unbalanced converter output voltages and improper control of modulation due to an unequal number of SMs inserted between the different phase-legs. The derived mathematics model of the MMC demonstrates the impact of the SM fault in the circulating currents and capacitor voltages. For achieving the SM fault-tolerance, detailed analysis of the MMC’s electrical quantities under SM fault-tolerant algorithms is provided together with two modulation reconfiguration techniques for maintaining voltage balance. Fault-tolerant abilities of the two modulation algorithms are also discussed and defined. Simulation results from a 21-level converter and experimental work in a three-phase five-level converter demonstrate the feasibility and performance of the proposed fault-tolerant control strategies.

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“…However, the voltage of the capacitor can create an imbalance due to a mismatch in conduction and the switching power losses. Balancing the SM capacitor voltages has been a major technical challenge in the latest research [4,5]. Currently, many kinds of literature on voltage balancing techniques are available.…”

Section: Introductionmentioning

confidence: 99%

Voltage Ride through Control Strategy of Modular Multilevel Converter under Unbalanced Voltage Sag

Hakimi

Hajizadeh

2019

Applied Sciences

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This paper develops modeling and describes a control strategy for a modular multilevel converter (MMC) for grid-connected renewable energy systems. The proposed model can be used to simulate MMC activity during normal and faulty situations. Firstly, a dynamic model of a grid-connected MMC (GC-MMC), based upon the symmetrical component of voltages and currents, was designed. Then an adaptive robust control approach was established in order to follow the reference currents of the converter and stabilize the submodule (SM) capacitor voltage. The positive and negative sequences of reference currents that were given from the demanded active and reactive power during grid voltage disturbance and a normal situation were then utilized in control loops. Finally, the numerical results for the performance of the MMC throughout voltage sag conditions and the effect of uncertainties on the filter parameters during changing power demands were evaluated. The results specified that the current control strategy is more potent under voltage sag situations and able to fulfill the stability requirements of the MMC.

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Balancing Control Schemes for Modular Multilevel Converters Using Virtual Loop Mapping With Fault Tolerance Capabilities

Cited by 28 publications

References 29 publications

Recent contributions and future prospects of the modular multilevel converters: A comprehensive review

Recent contributions and future prospects of the modular multilevel converters: A comprehensive review

Fault-Tolerant Control Strategies and Capability without Redundant Sub-Modules in Modular Multilevel Converters

Voltage Ride through Control Strategy of Modular Multilevel Converter under Unbalanced Voltage Sag

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