Impact of High Switching Speed and High Switching Frequency of Wide-Bandgap Motor Drives on Electric Machines

Xu, Yuming; Yuan, Xibo; Ye, Fei; Wang, Zihao; Zhang, Yonglei; Diab, Mohamed S.; Zhou, Wenzhi

doi:10.1109/access.2021.3086680

Cited by 55 publications

(33 citation statements)

References 25 publications

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“…The cause for resonance effects in the lower kHz-range is regarded as the interaction of passive elements, such as transformers, reactors, filters, cables and -often to a less extent -the electric machine. As published in [15], similar effects can occur in low voltage applications at higher swiching frequencies.…”

Section: Medium Frequency Resonance Effects In Literaturesupporting

confidence: 70%

On Medium Frequency Differential Mode Resonance Effects in Doubly Fed Induction Machines

Barnklau

Proske

2022

IEEE Open J. Ind. Applicat.

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During synchronization phase of a doubly fed induction machine prototype abnormal high voltages were recorded at stator terminals. By evaluating the measured curves, and the frequency response of a similar machine, these overvoltages could be traced back to differential mode resonance effects within the machine itself. The effect of differential mode resonance is not restricted to doubly fed induction machines but also occurs in other machine types such as squirrel cage induction machines. If not considered in the insulation design, such abnormal voltages will lead to a premature ageing of the insulation. Depending on the operating conditions, premature failures may occur. The measured data presented in the article give an illustrative example what could happen if windings of electric machines are excited near series resonance frequency. As the occurence of this effect becomes more probable the higher the switching frequency of the inverter, it is thoroughly important to be aware of it.

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Section: Medium Frequency Resonance Effects In Literaturesupporting

confidence: 70%

On Medium Frequency Differential Mode Resonance Effects in Doubly Fed Induction Machines

Barnklau

Proske

2022

IEEE Open J. Ind. Applicat.

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“…It is important to highlight that an increased cable length may trigger the voltage reflection phenomenon, which is harmful in VFD-fed EMs and results in overvoltage at the motor terminals [18]. In three-phase VFD-fed EMs system, PD measurements are also influenced by crosstalk phenomena, which result in interference between different phases of the EM [19].…”

Section: Methodsmentioning

confidence: 99%

Close accord on partial discharge diagnosis during voltage harmonics in electric motors fed by variable frequency drives

Hassan,

Akmal,

Hussain

et al. 2023

IET Generation Trans & Dist

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Partial discharge (PD) diagnostics test is a reliable solution for estimating insulation health conditions in power system components. During laboratory PD diagnostics, the effect of harmonic components in the voltage waveform generated by variable frequency drives (VFD) fed electric motors (EMs) is often overlooked. As VFD‐fed EMs operate at low speeds, the harmonic concentration in the voltage increases. It has been found that PD activity in VFD‐fed EM is significantly affected by the addition of harmonic components in the voltage, thus making it necessary to consider their impact when performing true PD diagnostics. This paper investigates the influence of voltage harmonic distortion produced in VFD‐fed EM on PD severity and the subsequent insulation degradation. Eight VFD‐fed EM are used to study the PD behaviour under different levels of harmonic pollution. The PD characteristics, such as inception voltage, pulse repetition rate, accumulated apparent charge, average discharge current, discharge power, and quadratic rate, are determined. Using probability distribution functions, PD activity and severity at various voltage harmonic levels are estimated. The proposed technique can be used to plan the maintenance activities that ensure the reliability for industrial applications dealing with the voltage harmonic distortion.

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“…Referring to Fig. 32b, for three-phase case, the equivalent CM circuit is formed as a two-port network with the paralleled three-phase and ground wire [37]. Therefore, the CM impedance can be obtained by measuring the impedance of the two-port network in open-circuit configuration, as shown in Fig.…”

Section: Appendix II the Ideal Rise Time Calculation Methodsmentioning

confidence: 99%

Mitigation of Motor Overvoltage in SiC-Based Drives Using Soft-Switching Voltage Slew-Rate ($dv/dt$) Profiling

Zhou

Diab

Yuan

et al. 2022

IEEE Trans. Power Electron.

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In silicon carbide (SiC) device based motor drives, the high voltage slew rate ( 𝒅𝒗/𝒅𝒕 ) associated with the fast switching transitions results in excessive motor overvoltage, due to the reflected wave phenomenon, which increases the motor winding insulation stress and causes premature failure while raises electromagnetic interference (EMI) problems. This article proposes a soft-switching voltage slew rate profiling approach to mitigate the motor overvoltage in SiC-based cable-fed drives. The proposed approach optimizes the rise/fall time of the output voltage according to the cable length, without altering the switching speed of the SiC devices. Since increasing the switching rise/fall time using conventional approaches, such as increasing the gate resistance, results in an increased switching power loss, the proposed profiling approach is implemented using a soft-switching inverter. The optimum rise/fall time that can significantly mitigate the overvoltage is derived using frequency and time domain analysis. The auxiliary resonant commutated pole inverter (ARCPI) is adopted as an example of the soft-switching inverter to experimentally verify the proposed slew rate profiling approach for the overvoltage mitigation. The analysis and experimental results show that the motor overvoltage is fully mitigated when the output voltage rise/fall time is set as the cable anti-resonance period, i.e., four times of the wave transmission time along the cable. Further, the slew-rate profiling approach along with the ARCPI reduces the switching loss and improves the EMI performance at high frequency region, compared with the conventional hard-switching converter. Specifically, the maximum efficiency of the ARCPI is about 99%.

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Impact of High Switching Speed and High Switching Frequency of Wide-Bandgap Motor Drives on Electric Machines

Cited by 55 publications

References 25 publications

On Medium Frequency Differential Mode Resonance Effects in Doubly Fed Induction Machines

On Medium Frequency Differential Mode Resonance Effects in Doubly Fed Induction Machines

Close accord on partial discharge diagnosis during voltage harmonics in electric motors fed by variable frequency drives

Mitigation of Motor Overvoltage in SiC-Based Drives Using Soft-Switching Voltage Slew-Rate ($dv/dt$) Profiling

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