Sensitivity Analysis on the Voltage Distribution within Windings of Electrical Machines fed by Wide Band Gap Converters

Pastura, Marco; Nuzzo, Stefano; Franceschini, Giovanni; Sala, Giacomo; Barater, Davide

doi:10.1109/icem49940.2020.9270958

Cited by 7 publications

(2 citation statements)

References 20 publications

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“…As such, they can be solved separately providing standalone information relative to overvoltages and interturn voltages. However, when the voltage distribution model was solved standalone, an ideal converter waveform would need to be hypothesized and the effects of the overvoltage on the voltage distribution would be inherently neglected [27]. As these phenomena are exacerbated in WBG-based drives, combining the two models is of paramount importance and represents an important progress beyond the state-of-the-art.…”

Section: The Combined Modelmentioning

confidence: 99%

Partial Discharges in Electrical Machines for the More Electric Aircraft—Part I: A Comprehensive Modeling Tool for the Characterization of Electric Drives Based on Fast Switching Semiconductors

et al. 2021

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The arrival on the market of new power devices based on wide bandgap semiconductors has raised a relevant interest due to their superior properties compared to conventional technologies. On the other hand, these devices are inherently characterized by high rates of voltage changes over time, which may result in reliability challenges in electric drives adopting them. In fact, dangerous voltage overshoots at the motor terminals and uneven voltage distributions within the machine windings may occur. These phenomena can trigger a high insulation stress and partial discharges and, as a consequence, they may concur to the premature failure of the dielectric materials. This paper proposes a flexible and comprehensive modelling approach for the accurate analysis and estimation of both voltage overshoots and voltage distributions in a typical converter-cable-motor system intended for more electric aircraft applications. The modelling results are validated against experimental measurements carried out on a physical prototype comprising a wide bandgapbased converter, a connecting cable and an electrical machine stator. The findings are then used in the companion papers (part II and part III) to investigate the dependence of partial discharge phenomena on these voltage waveforms, highlight reliability challenges in modern 270 V DC bus voltage drives for the more electric aircraft and discuss solutions.

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Section: The Combined Modelmentioning

confidence: 99%

Partial Discharges in Electrical Machines for the More Electric Aircraft—Part I: A Comprehensive Modeling Tool for the Characterization of Electric Drives Based on Fast Switching Semiconductors

et al. 2021

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“…For random wound motors, there is a concrete risk that, in the coil connected to the line terminal, two turns having a potential difference comparable to the phase-toground voltage are in contact, leading to a high electrical stress. Compared to conventional silicon switches, SiC exacerbate these phenomena as reflections can occur with very short cables and the turn voltage distribution becomes even more uneven [7], [8].…”

Section: Introductionmentioning

confidence: 99%

Partial Discharge Phenomena in Electrical Machines for the More Electrical Aircraft. Part II: Impact of Reduced Pressures and Wide Bandgap Devices

Lusuardi¹,

Rumi²,

Cavallini³

et al. 2021

IEEE Access

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This paper focuses on the inception of partial discharges within the insulation system of electrical actuators used for the More Electrical Aircraft (MEA). Since these machines should operate in the absence of Partial Discharges (PDs), the dependence of the PD Inception Voltage (PDIV) on voltage impulses typical of wide bandgap (SiC) devices is investigated at both 1 bar, reduced pressures close to those typical of aircraft cruising altitudes (150 mbar-200 mbar) or lower (down to 5 mbar). Propagation issues are not dealt with here as results were obtained working on insulation models consisting of couples of wires twisted together (twisted pairs), thus knowing exactly the potential differences between all points of the insulation model. The results show that the rise times and the switching frequencies associated with wide bandgap devices have little impact on the PDIV. A model able to predict the PDIV of the turn/turn insulation of random wound motors (the most vulnerable part of the insulation) at different pressures is proposed. The model is also able to deal with temperature changes, with limitations that depend on the type on insulation systems. INDEX TERMS Partial discharges, More Electrical Aircraft, MEA, wide bandgap devices, SiC inverter, Qualification. I.

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dV/dt Impact on Turn-to-Turn Overvoltage Distribution in Motor Windings

Azadeh,

Mirza,

Choksi

et al. 2023

2023 IEEE Symposium on Electromagnetic Compatibility &Amp; Signal/Power Integrity (EMC+SIPI)

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Sensitivity Analysis on the Voltage Distribution within Windings of Electrical Machines fed by Wide Band Gap Converters

Cited by 7 publications

References 20 publications

Partial Discharges in Electrical Machines for the More Electric Aircraft—Part I: A Comprehensive Modeling Tool for the Characterization of Electric Drives Based on Fast Switching Semiconductors

Partial Discharges in Electrical Machines for the More Electric Aircraft—Part I: A Comprehensive Modeling Tool for the Characterization of Electric Drives Based on Fast Switching Semiconductors

Partial Discharge Phenomena in Electrical Machines for the More Electrical Aircraft. Part II: Impact of Reduced Pressures and Wide Bandgap Devices

dV/dt Impact on Turn-to-Turn Overvoltage Distribution in Motor Windings

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