Virtual Submodule Concept for Fast Semi-Numerical Modular Multilevel Converter Loss Estimation

Christe, Alexandre; Dujić, Dražen

doi:10.1109/tie.2017.2677336

Cited by 19 publications

(10 citation statements)

References 16 publications

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“…The extended VSM method will be demonstrated in three steps: (i) benchmarking of the method against a PLECS switched model for a two-level three-phase converter in order to demonstrate the accuracy of the output flux obtained with the flux ripple model, (ii) demonstration of the method for one multi-level and -phase case and (iii) comparison of the semiconductor losses obtained with the extended VSM against both the original VSM proposal [1] and a detailed PLECS switched model.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…A semi-numerical method has been proposed in [1] for the fast estimation of submodule losses for a DC/AC modular multilevel converter (MMC) using the concept of virtual submodule (VSM). In that work, the need for detailed and time consuming switched model simulations is avoided by adopting an analytical average model that captures the low order harmonics in the branch capacitor voltage, branch current and branch modulation index.…”

Section: Introductionmentioning

confidence: 99%

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Novel insight into the output current ripple for multilevel and multiphase converter topologies

Christe

Dujić

2017

2017 IEEE 18th Workshop on Control and Modeling for Power Electronics (COMPEL)

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Abstract-When it comes to the computation / estimation of the switching losses in a multilevel converter, it is crucial to know the instantaneous value of the output current. If the average output current value is used instead, there is a non negligible error when the quality of the output current waveform is low. This paper addresses this issue with a generic and versatile fast numerical method for phase-disposition PWM that produces the exact switching pattern, hence the exact inductor flux, without having to run time-domain switched simulation(s), as the calculations are performed for the minimal set of points required to fully determine the inductor flux ripple at the switching instants.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel insight into the output current ripple for multilevel and multiphase converter topologies

Christe

Dujić

2017

2017 IEEE 18th Workshop on Control and Modeling for Power Electronics (COMPEL)

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“…where M is the modulation index and wt is the phase angle of the phase voltages. According to (4), in conventional SVM the reference vector follows a circular path as illustrated in [33, Fig. 1].…”

Section: B Conventional Svmmentioning

confidence: 99%

“…M ODULAR multilevel converters (MMCs) are an attractive solution for applications [1], [2]. They feature superior characteristics, such as high modularity [3], high efficiency [4], higher voltage level availability [5], low total harmonic distortion (THD) [6], and high power quality [7]. However, these admirable aspects come at the price of a more complicated structure with an increased number of power electronic devices.…”

Section: Introductionmentioning

confidence: 99%

Fault-Tolerant Space Vector Modulation for Modular Multilevel Converters With Bypassed Faulty Submodules

Aleenejad

Mahmoudi

Jafarishiadeh

et al. 2019

IEEE Trans. Ind. Electron.

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This paper develops a modulation based faulttolerant (FT) strategy for restoring the operation of threephase modular multilevel converters (MMCs) with faulty switches. This FT strategy is based on a proposed modified space vector modulation (SVM) technique that generates balanced line-to-line (line) voltages even in the case of a fault occurrence. In the postfault operation, the proposed strategy is able to restore the fundamental amplitude of the line to the neutral (load) voltages to that of the normal operation condition with a slightly increased voltage stress over the switches in the faulty phase. In this paper, first a brief background about MMCs and SVM technique is provided. Then, the proposed FT strategy and the modified SVM technique are presented. Finally, several simulation and experimental results are provided to validate operation of the proposed strategy.

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“…The SM's bypass is either triggered by the local SM controller (e.g., in case a gate driver fault is detected) or as last resort with a chain of transil diodes located at the SM terminals to detect over-voltages (OVD). Additional information on the MMC design is available in [11]- [14]. Consequently, isolated voltages have to be provided to the semiconductor's gate drivers (IGBTs), SM's controller, ASPS self-supply and protection circuit (over voltage detection sub-circuitry, antiparallel thyristors and permanent bypass relay).…”

Section: Submodule Application Overviewmentioning

confidence: 99%

Auxiliary Submodule Power Supply for a Medium Voltage Modular Multilevel Converter

et al. 2019

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The auxiliary submodule power supply is a vital component of a modular multilevel converter submodule or any multi-submodule converter. Considering the high isolation requirements and difficulties to provide power from the ground potential, the auxiliary submodule power supply must be simple, work reliably and not compromise the submodule's reliability. A flyback supply from the submodule's dc link with multiple sets of isolated secondary windings solves at once the low-voltage generation and the required voltage isolation for semiconductor gate circuits and protection without need for an externally supplied lowvoltage input to the submodule (high-isolation connection). This paper presents an isolated, flyback-based auxiliary submodule power supply with planar magnetic, printed circuit board integrated windings and multiple isolated outputs for a medium voltage modular multilevel converter as well as detailed electrical and magnetic mathematical modelling, technological integration challenges description and proper experimental test considerations. Index Terms-Auxiliary submodule power supply (ASPS), flyback, modular multilevel converter (MMC), planar transformer. NOMENCLATURE V sm Submodule voltage. L p Flyback transformer primary inductance. I p Primary peak current. D Duty cycle. f sw Switching frequency. N Turns number. μ 0 Permeability in vacuum. μ r Relative permeability.  Magnetic reluctance. l ag Air-gap length. V DS Drain to source voltage. V L Voltage spike due to the leakage inductance. V D Rectifier diode forward voltage drop. R load,eq Equivalent load resistance. C out,eq Equivalent output capacitance. R ESR Equivalent series resistance.

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Virtual Submodule Concept for Fast Semi-Numerical Modular Multilevel Converter Loss Estimation

Cited by 19 publications

References 16 publications

Novel insight into the output current ripple for multilevel and multiphase converter topologies

Novel insight into the output current ripple for multilevel and multiphase converter topologies

Fault-Tolerant Space Vector Modulation for Modular Multilevel Converters With Bypassed Faulty Submodules

Auxiliary Submodule Power Supply for a Medium Voltage Modular Multilevel Converter

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