Dimensioning and design of a Modular Multilevel Converter for drive applications

Kolb, Johannes; Kammerer, Felix; Braun, Michael

doi:10.1109/epepemc.2012.6397380

Cited by 98 publications

(44 citation statements)

References 5 publications

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“…The major advantage of this method is that there is no need for energy exchange between the arms to compensate for the increased energy pulsation in the capacitors [11], [12], as this is accommodated in another way. This is valuable and applicable in a wide range of frequencies below the base speed.…”

Section: Discussionmentioning

confidence: 99%

“…Presently, no M2C control method has been presented that can be used in the entire speed range. Moreover, a considerable over-rating of the M2C is required in variablespeed applications according to [12], even if several measures are taken to reduce it. In [13] it was shown that different This paper was presented at the IEEE Energy Conversion Congress & Exposition (ECCE) in Denver, CO, USA September 15-19, 2013 A. Antonopoulos, and L. Harnefors are with ABB Corporate Research, Västerås, Sweden, and also with the KTH Royal Institute of Technology, 100 44 Stockholm, Sweden (e-mail: antonios.antonopoulos@se.abb.com, lennart.harnefors@se.abb.com).…”

Section: Introductionmentioning

confidence: 99%

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

Antonopoulos

Ängquist

Harnefors

et al. 2015

IEEE Trans. Power Electron.

107

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Abstract-Variable-speed drives have reduced voltage requirements when operating below the base speed. In a modularmultilevel-converter-based (M2C-based) motor drive it is then possible to operate with reduced voltage in the submodule capacitors, than at the base speed. In this sense, a greater capacitor-voltage ripple can be accommodated, without exceeding the maximum peak-capacitor voltage. This paper presents an analytical investigation for the optimal selection of the average capacitor voltage for M2Cs, when the motor is operating with rated torque, below the base speed. This method does not require any power exchange between the converter arms, so it keeps the conduction losses at the minimum level. Additionally, the method decreases the switching losses, due to the decreased capacitor-voltage level. The overall ratings of the converter remain the same as in the base-speed operation. It is shown that this method can be applied at a speed range between the base speed and down to approximately one third of it, i.e, an operating range that covers the requirements for typical pump-and fan-type applications. The results obtained from the analytical investigation are experimentally verified on a downscaled laboratory prototype M2C.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Antonopoulos

Ängquist

Harnefors

et al. 2015

IEEE Trans. Power Electron.

107

View full text Add to dashboard Cite

show abstract

“…Some examples of these are [11], [12] and [13]. These typically represent work where the aim is to develop a demonstrator that operates within a laboratory environment.…”

Section: Modular Multilevel Converter Design For Vsc Hvdc Applicationsmentioning

confidence: 99%

Modular Multilevel Converter Design for VSC HVDC Applications

Oates¹

2015

IEEE J. Emerg. Sel. Topics Power Electron.

120

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The Modular Multilevel Converter (MMC), originally proposed by Professor Marquardt, has made it practical to realise converters with ratings up to 1000MW using standard components developed for variable speed drives. With the power electronics packed into individual "sub-modules", the ability to realise a converter where the AC and DC voltages are under direct control and have very little distortion appears to be an ideal; however, while there have been several papers published covering the design considerations required to ensure these converters operate correctly from an academic perspective, the method of specifying the design of a fully rated MMC, where several hundred sub-modules may be required for each valve to meet all conditions in service have not been discussed. The paper outlines a procedure for calculating the values of the transformer turns ratio, the transformer reactance and the valve reactance before considering how the ripple that appears on the submodule voltage affects the operating performance of the converter. This ripple limits the sub-modules from being able to fully utilise their capability so the principal operators that affect the ripple voltage are considered. The main independent variables available are the sub-module capacitor value, the number of sub-modules per valve and the average capacitor voltage setting, which is set as a servo demand within the control. All these inputs have an effect on all aspects of the converter performance and so must be set together while considering other system variables such as the variation in the AC voltage.

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“…Also, design of the capacitor bank and its effect on the other parameter design needs to be carefully studied. Several studies have been addressed the capacitor design issue for the MMC in the literature [7]. Dimensioning for the sub-module capacitor in the MMC has been presented in [8].…”

Section: Introductionmentioning

confidence: 99%

Reliability modeling of capacitor bank for Modular Multilevel Converter based on Markov State-Space Model

Najmi

Wang

Burgos

et al. 2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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since capacitors are the main components which cause failure in medium voltage and high voltage power converters, it is very essential to study and assess the reliability of capacitors within a converter. In this paper, the reliability modeling of the capacitor bank for the Modular Multilevel Converters (MMC) based on Markov State-Space Model (MSSM) is carried out and then within a determined case study, reliability of the capacitor bank is evaluated by considering both Aluminum Electrolytic (ALE) Capacitor Bank (CB) and film CB designs. Furthermore, the comparison among the reliability modeling methods i.e. Part-Count, Combinatorial and Markov Model has been done and it is shown that the Markov Model result by considering the fault tolerance and redundancy for the capacitor bank are expected to be more accurate and it has more pragmatic results with respect to the other reliability models.

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Dimensioning and design of a Modular Multilevel Converter for drive applications

Cited by 98 publications

References 5 publications

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

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

Modular Multilevel Converter Design for VSC HVDC Applications

Reliability modeling of capacitor bank for Modular Multilevel Converter based on Markov State-Space Model

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