Study and Comparison of Discontinuous Modulation for Modular Multilevel Converters in Motor Drive Applications

Picas, Ricard; Zaragoza, Jordi; Pou, Josep; Ceballos, Salvador; Konstantinou, Georgios; Capella, Gabriel J.

doi:10.1109/tie.2018.2847621

Cited by 40 publications

(26 citation statements)

References 39 publications

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“…The voltage ripples can be suppressed by injecting the resonant-frequency voltage (vr). In (15), the interaction between the resonant-frequency voltage (vr) and ACcirculating current (ixr) generates constant power and resonantfrequency power components. The constant power component suppresses the low-frequency power fluctuation (the first and second terms on the right-hand side), so there are only resonant-frequency power components in each half-arm.…”

Section: B Mitigation Of Sm Capacitor Voltage Ripple Under Low-speedmentioning

confidence: 99%

“…As seen in (15), the low-frequency power fluctuation is completely cancelled out by vrixr, so an injected current (ixr) with high amplitude flows through the flying-capacitors and switching devices. Thus, the amplitude of ixr can be reduced by controlling vrixr to follow the reference * * , which is expressed as:…”

Section: Adjustment Of Power Distribtion Through Flying-capacitor mentioning

confidence: 99%

“…If k = 1, the low-frequency power fluctuation is compensated completely, and if k = 0, there are no injections of * and * . Then, substituting (28) into (15), pxu1 can be obtained as:…”

Section: Adjustment Of Power Distribtion Through Flying-capacitor mentioning

confidence: 99%

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Reduction of Half-Arm Current Stresses and Flying-Capacitor Voltage Ripples of Flying-Capacitor MMCs

Lee

2020

IEEE Access

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In this paper, a new control scheme that can reduce the current stresses on switching devices, flying capacitors, and inductors for flying-capacitor modular multilevel converters (FC-MMCs) is proposed, which is based on redistribution of power difference between upper and lower arms through the flying capacitors. In addition, a way to determine the frequency range of the square-wave voltage to be injected into the FC-MMC is suggested, which is able to improve the current control performance and reduce the flyingcapacitor voltage ripples. The effectiveness of the proposed control scheme has been verified for a 4160-V/1-MW simulation model and a 230-V/3-kW prototype of the FC-MMC. INDEX TERMS Arm current, medium-voltage motor drive, modular multilevel converters (MMC), submodule (SM) capacitor voltage ripple.

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Section: B Mitigation Of Sm Capacitor Voltage Ripple Under Low-speedmentioning

confidence: 99%

Section: Adjustment Of Power Distribtion Through Flying-capacitor mentioning

confidence: 99%

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Reduction of Half-Arm Current Stresses and Flying-Capacitor Voltage Ripples of Flying-Capacitor MMCs

Lee

2020

IEEE Access

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“…In PWM operated three-phase electric drives, full DC-link voltage utilization can be achieved by means of (i) directly injecting the harmonic signal v * n to the fundamental reference voltages [25]- [27], or (ii) by using space vector modulation (SVM), where signal injection is inherent to the modulation process [26], [28], [29]. Both techniques add to the fundamental reference voltage a zero sequence signal (3rd, 9th, 15th.…”

Section: Introductionmentioning

confidence: 99%

Enhanced DC-Link Voltage Utilization for Sliding-Mode-Controlled PMSM Drives

Repecho

Sierra-Gonzalez

Ibarra

et al. 2021

IEEE J. Emerg. Sel. Topics Power Electron.

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Sliding mode control (SMC) can be considered for torque regulation of permanent magnet synchronous machines (PMSM) when fast transient response and/or robustness under parameter uncertainties are required. In some particular applications, a voltage harmonic injection technique that enhances the DC-link voltage utilization should be incorporated into the controller to operate at high speeds. Although this is straightforward for pulse width modulated (PWM) drives, a convenient definition of the sliding surfaces and an appropriate injection procedure must be implemented when using SMC. In this work, a novel approach to generate zero sequence voltage harmonic injection in surface mounted (SM) PMSM drives controlled by a fixed switching frequency first order SMC is proposed. A theoretical analysis is provided verifying the sliding mode existence and demonstrating the system stability when the sliding mode is reached. Finally, experimentation is carried out in an off-the-shelf PMSM drive, where two voltage injection patterns are tested. In both cases, the DC-link voltage utilization is extended by a 15 %, confirming the validity of the proposal.

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“…With the development of power electronics technology, the modular multilevel converter (MMC) has received extensive attention [1][2][3]. In recent years, due to its modularity, scalability, high efficiency, good harmonic performance, fault blocking capability, etc., it has been used more and more in the industry [4][5][6][7][8], such as energy storage system, medium voltage and high power motor drive system, power distribution system, high voltage direct current transmission, and so on.…”

Section: Introductionmentioning

confidence: 99%

Tracking Control of Modular Multilevel Converter Based on Linear Matrix Inequality without Coordinate Transformation

Liu

Yang

2020

Energies

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Modular multilevel converters (MMCs) play an important role in the power electronics industry due to their many advantages such as modularity and reliability. However, one of the challenges is to suppress fluctuations of circulating current and capacitor voltage and to ensure the quality of the output current. In this paper, the upper and lower arm voltages are employed as control inputs to control the output current and circulating current which are fed back to track the desired value. Based on linear matrix inequality (LMI), the control law of the MMC with multi-input system is designed to optimize the control value. The optimum arm voltage is divided by the SM nominal capacitor voltage to determine the number of SMs inserted into the upper/lower arm. The Voltage Sorting Algorithm (VSA) is then used to suppress the capacitor voltage fluctuation. The proposed tracking control strategy is implemented in MATLAB/Simulink. The results show that even under a small number of SMs (4 per arm), the output current can track the desired values and have better harmonic performance (current THD: 5.42%,voltage THD: 5.67%), and the fluctuations of the circulating current can be suppressed. Furthermore, it has better robustness and three-phase variable load fault tolerance.

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Study and Comparison of Discontinuous Modulation for Modular Multilevel Converters in Motor Drive Applications

Cited by 40 publications

References 39 publications

Reduction of Half-Arm Current Stresses and Flying-Capacitor Voltage Ripples of Flying-Capacitor MMCs

Reduction of Half-Arm Current Stresses and Flying-Capacitor Voltage Ripples of Flying-Capacitor MMCs

Enhanced DC-Link Voltage Utilization for Sliding-Mode-Controlled PMSM Drives

Tracking Control of Modular Multilevel Converter Based on Linear Matrix Inequality without Coordinate Transformation

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