Differential-Mode and Common-Mode Coupled Inductors for Parallel Three-Phase AC–DC Converters

Ohn, Sungjae; Zhang, Xuning; Burgos, Rolando; Boroyevich, Dushan

doi:10.1109/tpel.2018.2840110

Cited by 33 publications

(9 citation statements)

References 26 publications

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“…It is worth noticing that in (17) the term in the first bracket is the mean value of the capacitance deviations, whereas the square-root term represents the root mean square value of the capacitance deviations.…”

Section: Asymmetrical Filter Capacitorsmentioning

confidence: 99%

“…The matrix P of the eigenvectors, corresponding to the eigenvalues (17), when applied to (13) leads to transformed variables:…”

Section: Asymmetrical Filter Capacitorsmentioning

confidence: 99%

“…The fundamental result in (20) provides two different shift values to the nominal capacitance C in case of distinct eigenvalues (17). This means that under the general condition of two or three capacitance deviations, two different resonances are generated in the α and β circuits, and they are coupled into the zero-component circuit through (11c).…”

Section: Asymmetrical Filter Capacitorsmentioning

confidence: 99%

“…In all the approaches mentioned above, conducted EMI are modeled as the superposition of differential-mode (DM) and common-mode (CM) noise. Such separation is essential in EMI modeling and filter design [13][14][15][16][17][18]. It is well-known; however, that such sharp separation between DM and CM noise is possible only under the assumption that the converter is perfectly symmetrical with respect to the ground.…”

Section: Introductionmentioning

confidence: 99%

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Circuit Modeling and Statistical Analysis of Differential-to-Common-Mode Noise Conversion Due to Filter Unbalancing in Three-Phase Motor Drive Systems

Bellan

2020

Electronics

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This work deals with circuit modeling of noise mode conversion due to system asymmetry in a three-phase motor drive system. In fact, it is well-known that in case of system asymmetry (e.g., slightly asymmetrical LC filter parameters), differential-mode noise can convert into common-mode noise, resulting in increased level of conducted electromagnetic interference. This phenomenon has been observed with measurements and reported in previous works, but a clear and rigorous analytical description is still a challenging point. The main novelty proposed in the paper is a rigorous analytical description of differential-to-common-mode noise conversion based on the Clarke transformation and the eigenvalue analysis. In particular, the magnitude and the frequency location of the differential-mode resonances injected into the common-mode circuit are derived in closed form. Moreover, since system asymmetry is usually uncontrolled (e.g., component tolerance and parasitic elements), a statistical analysis is also presented by treating the parameters of the LC filter as random variables. Thus, a second contribution proposed in the paper is the analytical derivation in closed form of the probability density function, the mean value, and the standard deviation of the random frequency location of the resonance peaks injected into the common-mode circuit. The importance of the analytical results derived in the paper is two-fold. First, a deep theoretical understanding of the phenomenon in terms of circuit theory concepts is achieved. Second, the impact of differential-to-common-mode noise conversion is described in quantitative terms. Thus, the obtained analytical results can be used to predict or explain the noise conversion impact on the frequency-domain measurements of common-mode currents. Theoretical derivations are validated through a time-domain Simulink implementation of a three-phase motor drive system, and a frequency-domain analysis through the discrete Fourier transform.

show abstract

Section: Asymmetrical Filter Capacitorsmentioning

confidence: 99%

“…The matrix P of the eigenvectors, corresponding to the eigenvalues (17), when applied to (13) leads to transformed variables:…”

Section: Asymmetrical Filter Capacitorsmentioning

confidence: 99%

Section: Asymmetrical Filter Capacitorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Circuit Modeling and Statistical Analysis of Differential-to-Common-Mode Noise Conversion Due to Filter Unbalancing in Three-Phase Motor Drive Systems

Bellan

2020

Electronics

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“…The current path is removed either by using separate DC supplies to each inverter input [7] or by adding isolation transformers to each inverter output [8]. Increasing the impedance of the current path reduces the circulating current by adding coupled inductors (CIs) and common-mode inductors (CMIs) [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Parallel connected GaN E‐HEMT VSI‐based servo drives for PMSMs

Yuruk

Keysan

2021

IET Electric Power Appl

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The operation of parallel‐connected servo drives has the advantages of increasing the torque (hence the power) capacity, reliability, redundancy and modularity. However, smaller discrepancies of the system clocks of the independent microcontrollers, asynchronous pulse width modulation (PWM) carrier signals and hardware differences can make the output voltages of the parallel modules non‐identical, which results in circulating currents. These circulating currents limit the parallel operation, introduce additional power dissipation, cause unbalanced power distribution and degrade the control performance. To eliminate the circulating currents separated DC supplies, coupled inductors (CIs), PWM techniques, modified control techniques etc. are proposed in the literature. In this study, a fault‐tolerant parallel‐connected gallium nitride enhancement‐mode high electron mobility transistor voltage source inverter‐based servo drive scheme that eliminates the need for CIs and separate DC supplies and also enables the use of a standard proportional‐integral current control and a standard space vector PWM approach is proposed and tested. To evaluate the performances of the proposed scheme, up to six servo drives (limit‐6 × 7 Arms) are connected in parallel and tested under various conditions with a 24 V permanent magnet synchronous motor (nominal‐61.9 Arms). The results show that the parallel operation not only increases the torque capacity of the system but also increases modularity, flexibility, reliability and also redundancy.

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Phase current control to reduce unbalanced outputs in paralleled inverters

Lee,

Lee

2024

J. Power Electron.

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Differential-Mode and Common-Mode Coupled Inductors for Parallel Three-Phase AC–DC Converters

Cited by 33 publications

References 26 publications

Circuit Modeling and Statistical Analysis of Differential-to-Common-Mode Noise Conversion Due to Filter Unbalancing in Three-Phase Motor Drive Systems

Circuit Modeling and Statistical Analysis of Differential-to-Common-Mode Noise Conversion Due to Filter Unbalancing in Three-Phase Motor Drive Systems

Parallel connected GaN E‐HEMT VSI‐based servo drives for PMSMs

Phase current control to reduce unbalanced outputs in paralleled inverters

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