A Transformerless Medium Voltage Multiphase Motor Drive System

Wang, Dan; Yang, Jiawei; Chen, Zhu; Mao, Chengxiong; Lu, Jiming

doi:10.3390/en9050323

Cited by 4 publications

(3 citation statements)

References 24 publications

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“…Currently, MMC's commonly used modulation methods include carrier phase shift modulation, phase disposition modulation, and nearest level modulation. Because the phase disposition modulation (PD-PWM) method has better harmonic characteristics and is easier to implement [26,27], in this paper, PD-PWM is selected as the basic modulation strategy in subsequent analysis and experiment.…”

Section: Phase Disposition Pwm and Voltage Balancing Strategymentioning

confidence: 99%

A Novel Fault-Tolerant Control of Modular Multilevel Converter under Sub-Module Faults Based on Phase Disposition PWM

et al. 2018

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Each arm of modular multilevel converter (MMC) consists of a large number of sub-module (SM) units. However, it also increases the probability of SM failure during the long-term system operation. Focusing on the fault-tolerant operation issue for the MMC under SM faults, the traditional zero-sequence voltage injection fault-tolerant control algorithm is analyzed detailed and its disadvantages are concluded. Based on this, a novel fault-tolerant control strategy based on phase disposition pulse-width modulation (PD-PWM) is proposed in this paper, which has three main benefits: (i) it has carrier and modulation wave dual correction mechanism, which control ability is more higher and flexible；(ii) it only needs to inject zero-sequence voltage in half a cycle of the modulation wave, which simplifies the complexity of traditional zero-sequence voltage injection control algorithms and much easier for implement; (iii) furthermore, the zero-sequence voltage can even be avoided injecting under the symmetrical fault conditions. Finally, the effectiveness of the proposed control strategy is verified with the simulation and experiment studies under different fault conditions.

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Section: Phase Disposition Pwm and Voltage Balancing Strategymentioning

confidence: 99%

A Novel Fault-Tolerant Control of Modular Multilevel Converter under Sub-Module Faults Based on Phase Disposition PWM

et al. 2018

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“…Cascaded H‐bridge multilevel converters (CHB‐MLCs) have higher reliability to compensate for the drop of output voltage due to faulty switches than other common converters because of using isolated DC sources 21 . In this regard, these converters are used in sensitive cases such as electric ships and electric aircraft 22,23 . Therefore, the performance of these converters in the event of a fault is very important to work continuously.…”

Section: Introductionmentioning

confidence: 99%

Symmetrical switching strategy based on reduced switching state in a three‐phase multilevel converter with a single faulty cell

Zolfagharian

Dastfan

Marzebali

2021

Circuit Theory & Apps

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Due to the possibility of the occurrence of a fault in converters, performance improvement of a converter under faulty conditions is important. In this paper, for improving the performance of the three‐phase cascaded H‐bridge multilevel converters (CHB‐MLCs) with a single faulty cell, the quarter‐and half‐wave symmetry selective harmonic mitigation (SHM) modulation method as well as reducing the number of switching angles (NSA) has been used. Consequently, it helps to reduce the switching frequency (fs) and the number of sentences of the Fourier series thus simplifies the objective function. In addition, the proposed method enables the switching angles of a faulty cell to be transferred to other normal cells per phase. For this purpose, the switching angles of the cells are optimized so that at least one of the cells does not overlap with the other cells in the same phase. By employing the maximum modulation index under the faulty condition, the maximum capacities of the remaining DC sources are used and consequently, the line voltage drop in the output voltage is prevented. To produce a balanced line voltage, the fundamental phase‐shift Compensation (FPSC) method is employed. Simulation and experimental results are presented to confirm the efficiency of the proposed strategy.

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“…In the past decades, the multilevel converter based on the high frequency transformer has rapidly developed [4][5][6][7], and by using a cascaded H-bridge converter (CHB), it could achieve direct connection to the high voltage power grid. What is more, the use of CHB generates many extra advantageous characteristics, such as better power quality and flexible control of the output voltage [8].…”

Section: Introductionmentioning

confidence: 99%

Triple Line-Voltage Cascaded VIENNA Converter Applied as the Medium-Voltage AC Drive

et al. 2018

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A novel rectifier based on a triple line-voltage cascaded VIENNA converter (LVC-VC) was proposed. Compared to the conventional cascaded H-bridge converters, the switch voltage stress is lower, and the numbers of switches and dc capacitors are fewer under similar operating conditions in the proposed new multilevel converter. The modeling and control for the LVC-VC ware presented. Based on the analysis of the operation principle of the new converter, the power factor correction of the proposed converter was realized by employing a traditional one-cycle control strategy. The minimum average value and maximum harmonic components of the dc-link voltages of the three VIENNA rectifier modules ware calculated. Three VIENNA dc-link voltages were unbalanced under the unbalanced load conditions, so the zero sequence current was injected to the three inner currents for balancing three VIENNA dc-link voltages. Simulation and the results of the experiment verified the availability of the new proposed multilevel converter and the effectiveness of the corresponding control strategy applied.

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A Transformerless Medium Voltage Multiphase Motor Drive System

Cited by 4 publications

References 24 publications

A Novel Fault-Tolerant Control of Modular Multilevel Converter under Sub-Module Faults Based on Phase Disposition PWM

A Novel Fault-Tolerant Control of Modular Multilevel Converter under Sub-Module Faults Based on Phase Disposition PWM

Symmetrical switching strategy based on reduced switching state in a three‐phase multilevel converter with a single faulty cell

Triple Line-Voltage Cascaded VIENNA Converter Applied as the Medium-Voltage AC Drive

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