Analysis and mitigation of reflected wave voltages and currents in WBG devices based motor drives

Narayanasamy, Balaji; Sathyanarayanan, A.; Deshpande, Amol; Luo, Fang

doi:10.1109/wipda.2016.7799956

Cited by 9 publications

(8 citation statements)

References 13 publications

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“…The wires' ends are in the air. Whereas the previous studies [18] show that bipolar pulses can have a greater effect on insulation lifetime than unipolar pulses, so another pulse generator assembly was designed to evaluate this effect (Fig. 9).…”

Section: High Dv/dt Testing Methodsmentioning

confidence: 99%

“…The higher switching speeds in comparison with silicon components obtained with wide bandgap devices lead to the raise of common mode currents and dV/dt [18,19]. Thus testing methods must be adapted to the operating conditions taking into account the possible constraints (temperature, electrical stresses, humidity, pressure, vibrations), fetching out the most important ones, as well as the difficulties of their interaction analysis, the limit of the tests duration (the accelerated aging can be used to evaluate dielectrics endurance), and considering the available equipment.…”

Section: Introductionmentioning

confidence: 99%

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Development of testing methods for winding turn-to-turn insulation of low voltage motors fed by PWM converters

Bolgova

Lefebvre

Hlioui

et al. 2017

2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe)

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Electrical insulation materials quality and reliability play a central role in providing the electrical machines reliable operation. It is well recognized that insulating system of low voltage motor fed by converter is exposed to electrical stresses arising from repetitive square waveform of supplying voltage while additional impact of temperature, vibrations and environmental operation conditions are imposed. The implementation of wide bandgap power semiconductors as SiC and GaN in recent years allows to create very powerful converters with high switching speed. On the other hand it leads to a remarkable increasing electro-thermal constraints applied to windings' turn-to-turn insulation of motors fed by such converters. The relevance of new testing methods and test benches is well found by remarkable modern advances in semiconductors technology. Testing methods for low voltage motors winding wires insulation proposed in this paper permit to evaluate the withstand capability of insulation materials applying the high frequency modulated signals representative for traditional converters supplying (μs level of impulse rise/fall time), as well as the voltage waveforms with very straight adjustable dV/dt, very fast rise time and fall time (ns level of impulse rise/fall time) engendered by new semiconductor devices based on wide bandgap materials. The possibility to modify experiment parameters in wide rage for insulation endurance tests allows to obtain a rich data for further analysis.

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Section: High Dv/dt Testing Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of testing methods for winding turn-to-turn insulation of low voltage motors fed by PWM converters

Bolgova

Lefebvre

Hlioui

et al. 2017

2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe)

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“…Converter-load interference At the converter or system level, one challenge is the impact of the high dv/dt ouput voltage on loads such as electric machines (motors or generators), transformers (for grid-connection), connecting cables, etc. Taking a motor drive application as an example, high dv/dt can lead to an overvoltage (can be doubled or even higher) at the motor terminals due to the cable transmission line effect [61][62][63] as the dv/dt can normally reach 20kV/µs. With the high switching speed of SiC devices, the critial length of the cable, when significant overvoltage is taking place, will reduce from tens of meters for Si IGBT converters to several meters for SiC converters.…”

Section: Dmentioning

confidence: 99%

Opportunities, Challenges, and Potential Solutions in the Application of Fast-Switching SiC Power Devices and Converters

Yuan

Laird

Walder

2021

IEEE Trans. Power Electron.

118

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Power devices based on wide-bandgap (WBG) material such as silicon-carbide (SiC) can operate at higher switching speeds, higher voltages and higher temperatures compared to those based on silicon (Si) material. This paper highlights some opportunities brought by SiC devices in existing and emerging applications in terms of efficiency and power density improvement. While the opportunities are clear, there are also design challenges that must be met in order to realize their full potential. For example, the fast switching speeds and high dv/dt of SiC devices can cause increased electromagnetic interference (EMI), current overshoot, cross-talk effect and have a negative impact on loads such as motors. This paper presents several potential solutions to tackle the application challenges and to fully exploit the superior characteristics of SiC devices and converters while attenuating their negative side-effects. This paper provides an overview of recent SiC device research and development activities based on academic literature, work carried out by the authors and collaborators as well as input from industry. It aims to provide benchmark results and a timely and useful reference to accelerate the adoption and deployment of SiC devices and converters.

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“…[17] proposed a mitigation method of high-frequency bearing currents, but the switching frequency tested is limited to 3 kHz. Although there are various papers discussing the negative impact of SiC drives on motors [18]- [22], so far, to the authors' knowledge, there is no paper experimentally investigating high frequency bearing currents with SiC motor drives.…”

Section: Figurementioning

confidence: 99%

Experimental Assessment of High Frequency Bearing Currents in an Induction Motor Driven by a SiC Inverter

Yan²,

Yuan

et al. 2021

IEEE Access

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Compared with silicon (Si) IGBTs, silicon carbide (SiC) MOSFETs have much faster switching speeds and high switching frequency operation capability, enabling compact and high-efficiency motor drive systems. However, the increased switching speed and frequency also cause increased-level of common-mode (CM) voltage with higher slew rates (dv/dt). The CM voltage leads to machine leakage currents as well as bearing currents such as electric discharge machining (EDM) type current and capacitive-type (dv/dt) current. These bearing currents can cause degradation or failure of motor bearings. In order to investigate the impact of SiC motor drives on the motor bearing currents, in this paper, the mechanism and modelling of bearing currents are analyzed first. Then, a direct measurement method is used to assess the bearing currents in the induction motor driven by the SiC converter. In the experiment, the number of EDM current events is counted and the amplitude of the capacitive-type of current is also examined under various switching speeds and frequencies of SiC devices. Furthermore, the bearing currents are also extensively tested under various bearing temperatures, motor speeds and dc-link voltages. The correlations between the bearing currents and various factors have been revealed in this paper.INDEX TERMS Motor bearing, bearing current, SIC MOSFET, motor drive, common mode voltage, fastswitching.

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Analysis and mitigation of reflected wave voltages and currents in WBG devices based motor drives

Cited by 9 publications

References 13 publications

Development of testing methods for winding turn-to-turn insulation of low voltage motors fed by PWM converters

Development of testing methods for winding turn-to-turn insulation of low voltage motors fed by PWM converters

Opportunities, Challenges, and Potential Solutions in the Application of Fast-Switching SiC Power Devices and Converters

Experimental Assessment of High Frequency Bearing Currents in an Induction Motor Driven by a SiC Inverter

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