Fault-Tolerant Control of MMC With Hot Reserved Submodules Based on Carrier Phase Shift Modulation

Li, Kai; Yuan, Liqiang; Zhao, Zhengming; Lu, Shaoyong; Zhang, Yiming

doi:10.1109/tpel.2016.2628762

Cited by 108 publications

(40 citation statements)

References 28 publications

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“…When two SMs on the upper arm of phase A fault, the carrier phase shift angle of the bridge is changed to 2π/3, and the SM capacitance voltage reference value of the upper arm is set to 814/3 = 271 V, the carrier phase shift angle of the lower arm maintains 2π/5, each SM capacitor voltage reference value is changed to 210 V, according to Equation (22), as shown in Figure 5a. By contrast, in Figure 5b, when the symmetrical fault-tolerant control is adopted, the output voltage of inverter is only 4 levels, which is much less than the improved asymmetrical tolerance control in this paper.…”

Section: Analysis Of Simulation Results Of Two Sm Faults In Phase Amentioning

confidence: 99%

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Research on Unbalance Fault-Tolerant Control Strategy of Modular Multilevel Photovoltaic Grid-Connected Inverter

Liu

Jin

et al. 2018

Energies

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Abstract:The average switching model of modular multilevel converter (MMC) is built in this paper when the hot reserved strategy is adopted as a fault-tolerant control. When the MMC SM faults, the rest of the SMs cannot support the DC-link voltage, which results in interruption of the inverter. To tackle this issue, a novel fault-tolerant control strategy is proposed to bypass the SM under fault and re-regulate the SM capacitor voltage and carrier phase-shift angle to maintain the main components of circulating current, and reduce the Total Harmonic Distortion (THD) of grid connected current to enable the stable operation of the photovoltaic inverter. The maximum power tracking control is improved to solve the problem of long restoration time when faults occur, based on a constant voltage startup method combined with a fix-step incremental conductance method. Simulations in MATLAB/Simulink and experimental results have verified the feasibility and effectiveness of the proposed control strategy.

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Section: Analysis Of Simulation Results Of Two Sm Faults In Phase Amentioning

confidence: 99%

“…A rotating sliding choice box adopted in a novel fault tolerant control strategy is proposed [22] to select the operating SMs, and guarantees the operation with a nearly seamless transition and very short recovery time. Meanwhile, the line cycle is set as the rotating period in the control method, without increasing much switching loss.…”

Section: Introductionmentioning

confidence: 99%

Research on Unbalance Fault-Tolerant Control Strategy of Modular Multilevel Photovoltaic Grid-Connected Inverter

Liu

Jin

et al. 2018

Energies

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“…Two ways to implement Method-I have emerged, viz. [73]- [76] and [20], [27]- [31]. The main difference is the choice of the reference Vcijk* used by each SM capacitor voltage controller that ensures capacitor voltage balancing.…”

Section: A Method-i: Internal Voltage Control Scheme Based On Indivimentioning

confidence: 99%

Analysis and Assessment of Modular Multilevel Converter Internal Control Schemes

Wang

Adam

Massoud

et al. 2020

IEEE J. Emerg. Sel. Topics Power Electron.

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Adoption of distributed submodule (SM) capacitors in a modular multilevel converter (MMC) necessitates complex controllers to ensure the stability of its internal dynamics. This paper presents comprehensive analysis and assessment of different proportional resonant (PR)-based control schemes proposed to stabilize the internal dynamics and ensure ac and dc sides power quality of the MMC within a dc transmission system. With the consideration of passive component tolerances, different energy and voltage based control schemes under various conditions are analyzed. It has been established that without vertical voltage balance control, unequal passive component values in the upper and lower arms of the same phase-leg may cause: unbalanced fundamental currents in the arms, unequal dc voltage across the arms, and fundamental oscillations in the common-mode currents that lead to fundamental frequency ripple in the dc link current. The theoretical analysis that explains this mechanism is presented, and is used to show that vertical voltage balancing is necessary for the nullification of arm voltage difference and suppression of odd oscillations caused by capacitive/inductive asymmetry between arms of the same phase-leg. Simulations support the theoretical analysis and the effectiveness of voltage balancing in ensuring correct operation, independent of tolerances of the MMC passive elements and operating conditions. A new direct method for elimination of fundamental oscillations in the common-mode and dc link current is proposed. Experimental results from a singlephase MMC prototype validate the presented theoretical discussions and simulations.

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“…Proposed PSRC method can be run at a low switching frequency range of 50 to 100 Hz and provides capacitor voltage balancing. New control strategy is presented in Li et al using hot reserved SMs with the help of PSC‐PWM modulation technique, which provides fault‐tolerant operation in a short recovery time and eliminates the undesired pulses.…”

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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Fault-Tolerant Control of MMC With Hot Reserved Submodules Based on Carrier Phase Shift Modulation

Cited by 108 publications

References 28 publications

Research on Unbalance Fault-Tolerant Control Strategy of Modular Multilevel Photovoltaic Grid-Connected Inverter

Research on Unbalance Fault-Tolerant Control Strategy of Modular Multilevel Photovoltaic Grid-Connected Inverter

Analysis and Assessment of Modular Multilevel Converter Internal Control Schemes

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

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