Practical Design Considerations for MV LCL Filter Under High dv/dt Conditions Considering the Effects of Parasitic Elements

Acharya, Sayan; Anurag, Anup; Prabowo, Yos; Bhattacharya, Subhashish

doi:10.1109/pedg.2018.8447701

Cited by 29 publications

(17 citation statements)

References 12 publications

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“…Similarly, the equivalent sidewall-to-core capacitance in Case 2 and Case 3 is presented as (13) and (14), respectively.…”

Section: C21 Dynamical Capacitance Between the Sidewall Of Winding mentioning

confidence: 99%

“…Yet, the high dv/dt problem becomes more significant during the switching transitions of SiC MOSFETs [4]. Under the high dv/dt conditions, the parasitic capacitances of passive and active power components, such as the common-mode capacitance of gate drivers [5], [6], the ground capacitance of heatsink [7], the parasitic capacitance in power modules [8], [9], and the parasitic capacitance in transformers [10][11][12] and inductors [13][14][15], can bring large common-/differential-mode current into the converter circuit [13], causing electromagnetic interferences [4] and accelerating the aging of power components [16].…”

Section: Introductionmentioning

confidence: 99%

“…The problems become even worse in the applications of medium-voltage (MV) SiC MOSFETs. It has been reported that the current spikes on filter inductors are more significant than the rated current, due to the larger parasitic capacitance caused by the extra insulation and higher inductance with a larger number of turns [13]. Further, the harmonic spectra of MV converter switching waveforms tend to have higher magnitudes due to the larger dv/dt introduced by the WBG devices, which also increase the capacitive current [15].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Parasitic Capacitance in Copper-Foiled Medium-Voltage Filter Inductors

Zhao¹,

Huang²,

Dalal³

et al. 2020

Preprint

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This paper characterizes three parasitic capacitances in copper-foiled medium-voltage inductors. It is found that the conventional modeling method overlooks the effect of the fringe field, which leads to inaccurate modeling of parasitic capacitances in copper-foiled inductors. To address this problem, the parasitic capacitances contributed by the fringe field is identified first, and a physics-based analytical modeling method for the parasitic capacitances contributed by the fringe field is proposed, which avoids using any empirical equations. The total parasitic capacitances are then derived for three different cases with three different core potentials, from which a three-terminal equivalent circuit is derived, and thus, the parasitic capacitances in copper-foiled inductors are explicitly identified. The calculated results show a close agreement with the measured capacitance by using an impedance analyzer.

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“…Similarly, the equivalent sidewall-to-core capacitance in Case 2 and Case 3 is presented as (13) and (14), respectively.…”

Section: C21 Dynamical Capacitance Between the Sidewall Of Winding mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Parasitic Capacitance in Copper-Foiled Medium-Voltage Filter Inductors

Zhao¹,

Huang²,

Dalal³

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…It has been investigated, e.g. in [29,30] for low voltage applications and in [31][32][33][34][35] for medium-voltage applications. Contributions on LCL-filter design with comparable voltage and power rating can be found in [31][32][33].…”

Section: Reference Lcl-filter-based Converter Systemmentioning

confidence: 99%

Grid‐connected medium‐voltage converters with parallel voltage‐source active filters

Bernet

Hiller

2019

IET Electric Power Applications

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Grid-connected medium-voltage converters are typically operated at switching frequencies of several hundred hertz per switch position, requiring bulky and expensive LCL filters in order to meet the harmonic limits given by the grid code. Commonly, semiconductor current derating and increased switching frequencies are used to reduce the LCL-filter costs, leading to a reduced utilisation and efficiency of the converter system. To overcome these disadvantages of conventional converter systems, the presented hybrid converter uses a parallel voltage-source active output filter and thus allows a significant reduction of the passive component demand. The harmonic performance is improved for the operation with small passive filter components, revealing the potential for increasing the utilisation and efficiency of high power medium-voltage converters. As a result, significant reductions of the filter losses and passive components as well as an increased output power are achieved compared to a reference LCL-filter-based converter system.

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“…The parasitic capacitance in magnetics is of growing importance [1]- [5] due to the exponentially increasing use of wide-band-gap devices in power electronic converters to operate at higher frequency with faster switching transients [6]- [8]. Faster switching speed can result in larger currents due to the parasitic capacitance in inductors, which will cause extra losses in transistors [9] and EMI/EMC issues [1], [10], and therefore limit the potential performance of highfrequency converters. In order to mitigate the effects of parasitic capacitance in magnetic components, it is important to properly model and analyze parasitic capacitance.…”

Section: Introductionmentioning

confidence: 99%

Rethinking Basic Assumptions for Modeling Parasitic Capacitance in Inductors

Zhao¹,

Luan²,

Shen³

et al. 2021

Preprint

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<b>This paper rethinks the basic assumptions often used in analytically modeling parasitic capacitance in inductors. These assumptions are classified in two commonly-used physics-based analysis methods: the lumped capacitor network method and the energy conservation method. The lumped-capacitor network method is not the proper solution for calculating the equivalent parasitic capacitance in inductors at the first resonant frequency, but rather represents the equivalent parasitic capacitance above the last resonant frequency. The energy-conservation based method is shown to be more accurate and a reasonable solution to model the equivalent parasitic capacitance at the first resonant frequency. Multiple case studies of inductors are used for verifying the theory. </b>

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Practical Design Considerations for MV LCL Filter Under High dv/dt Conditions Considering the Effects of Parasitic Elements

Cited by 29 publications

References 12 publications

Parasitic Capacitance in Copper-Foiled Medium-Voltage Filter Inductors

Parasitic Capacitance in Copper-Foiled Medium-Voltage Filter Inductors

Grid‐connected medium‐voltage converters with parallel voltage‐source active filters

Rethinking Basic Assumptions for Modeling Parasitic Capacitance in Inductors

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