Optimal Selection of the Average Capacitor Voltage for Variable-Speed Drives With Modular Multilevel Converters

Antonopoulos, Antonios; Ängquist, Lennart; Harnefors, Lennart; Nee, Hans‐Peter

doi:10.1109/tpel.2014.2316273

Cited by 107 publications

(54 citation statements)

References 20 publications

(33 reference statements)

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“…This procedure generates high circulating currents as ω e increases, because the available cluster voltage has to be used to synthesise the machine voltage, reducing the value of V 0 [see (13)]. However, in this paper a methodology to reduce the circulating currents by using a specific non-zero set-point value for v ∆ Cdq is proposed.…”

Section: B Influence Of the Vector V ∆mentioning

confidence: 99%

An Integrated Converter and Machine Control System for MMC-Based High-Power Drives

Espinoza-B.

Cárdenas

Clare

et al. 2019

IEEE Trans. Ind. Electron.

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Section: B Influence Of the Vector V ∆mentioning

confidence: 99%

An Integrated Converter and Machine Control System for MMC-Based High-Power Drives

Espinoza-B.

Cárdenas

Clare

et al. 2019

IEEE Trans. Ind. Electron.

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“…The Modular Multilevel Converter (MMC) has been widely used in the field of high voltage direct current (HVDC) transmission [1,2], and has attracted increasing attention for the application of medium-voltage adjustable-speed motor drive [3,4,5]. The great potential of MMC for ship electric propulsion has been mentioned in [6].…”

Section: Introductionmentioning

confidence: 99%

An Improved Strategy for Modular Multilevel Converter at Low Speed Operation

Zeng

Xiao

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract.One of the main problems of the Modular Multilevel Converter (MMC) for ship electric propulsion applications is the significant magnitude of capacitor voltage ripple at low speed operation. The commonly used solution is harmonic injection. In this paper, the injection rules are explored through the dynamic relationship of MMC in a comprehensive way, and the harmonic characteristics of injection current are derived. Furthermore, the circulating current controller is modified according to the harmonics of injected current with changing frequency, which reduces the ripple of capacitor voltage effectively in a wide speed range. Simulation results are shown to demonstrate the effectiveness of the proposed method. IntroductionThe Modular Multilevel Converter (MMC) has been widely used in the field of high voltage direct current (HVDC) transmission [1,2], and has attracted increasing attention for the application of medium-voltage adjustable-speed motor drive [3,4,5]. The great potential of MMC for ship electric propulsion has been mentioned in [6]. The main challenge of the application of MMC-based drive system is the suppression of capacitor voltage ripple at low speed operation.In order to suppress the voltage ripples of submodule (SM) capacitor which increase significantly as the output frequency decreases, several schemes have been adopted. Harmonic injection is the most mature method at present. The values of injected components are usually derived from MMC's arm energy relations. Several components are neglected in the derivation process which make the derivation result lack of comprehensiveness.The injected circulating current is regulated by the circulating current controller which also controls the even harmonics caused by MMC's mechanism. The performance of the circulating current controller is related to the control accuracy of the injected current. Many control strategies have been used in the design of current controller, such as repetitive control [7], model predictive control [8], and multiple quasi-resonant control [9], but they are only designed to regulate the even harmonics at the rated frequency. Meanwhile some other literatures like [10], [11] put emphasis on the control of the injected current but neglect the even harmonics which needs to be regulated at the same time. In [12], the current controller contains six resonant controllers to regulate the second harmonic and injected harmonics at low speed operation, but it is not suitable with the changing frequency.In this paper, the injection rules are explored through the relations of mathematical model, and the proposed formula of harmonic injection is derived from the rules. The circulating current controller is

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“…However, AC drive-based MMCs are only suitable for industrial fans, pumps and other applications of small speed range close to the rated value. In order to solve the low-frequency torque ripple issues of conventional MMC motor drive systems, many scholars have component injection and pulse optimization [16][17][18][19]. However, the above method does not fundamentally eliminate the limitations of MMC variable frequency-speed regulation control.…”

Section: Introductionmentioning

confidence: 99%

Super Capacitor Energy Storage Based MMC for Energy Harvesting in Mine Hoist Application

et al. 2017

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This paper proposes a super capacitor energy storage-based modular multilevel converter (SCES-MMC) for mine hoist application. Different from the conventional MMCs, the sub-modules employ distributed super capacitor banks, which are designed to absorb the regenerative energy of mine hoist and released in the traction condition, so as to improve energy utilization efficiency. The key control technologies are introduced in detail, followed by analysis of the configuration and operation principles. The feasibility of the proposed SCES-MMC topology and the control theory are also verified. Simulation results show that SCES-MMC can adapt to the variable frequency speed regulation of the motor drive, which shows good application prospects in the future for mediumand high-voltage mine hoist systems.

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Optimal Selection of the Average Capacitor Voltage for Variable-Speed Drives With Modular Multilevel Converters

Cited by 107 publications

References 20 publications

An Integrated Converter and Machine Control System for MMC-Based High-Power Drives

An Integrated Converter and Machine Control System for MMC-Based High-Power Drives

An Improved Strategy for Modular Multilevel Converter at Low Speed Operation

Super Capacitor Energy Storage Based MMC for Energy Harvesting in Mine Hoist Application

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