Analysis and Suppression of Shaft Voltage in SiC-Based Inverter for Electric Vehicle Applications

Han, Yang; Lu, Haifeng; Chai, Jianyun

doi:10.1109/tpel.2018.2873079

Cited by 51 publications

(29 citation statements)

References 19 publications

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“…Pairodamonchai et al suggested a hybrid output EMI filter to eliminate the high-frequency CMV components [168], and the researches on the optimization of filters have also been reported [169,170]. Moreover, an advanced inverter design can also help to reduce CMV: The active zero state PWM (AZSPWM) method [171] and the near state PWM (NSPWM) method [172] effectively suppress the neutral voltage of a motor.…”

Section: Reasonable Grounding and Minimizing The Electric Fieldmentioning

confidence: 99%

Electrical bearing failures in electric vehicles

2020

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In modern electric equipment, especially electric vehicles, inverter control systems can lead to complex shaft voltages and bearing currents. Within an electric motor, many parts have electrical failure problems, and among which bearings are the most sensitive and vulnerable components. In recent years, electrical failures in bearing have been frequently reported in electric vehicles, and the electrical failure of bearings has become a key issue that restricts the lifetime of all-electric motor-based power systems in a broader sense. The purpose of this review is to provide a comprehensive overview of the bearing premature failure in the mechanical systems exposed in an electrical environment represented by electric vehicles. The electrical environments in which bearing works including the different components and the origins of the shaft voltages and bearing currents, as well as the typical modes of electrical bearing failure including various topographical damages and lubrication failures, have been discussed. The fundamental influence mechanisms of voltage/current on the friction/ lubrication properties have been summarized and analyzed, and corresponding countermeasures have been proposed. Finally, a brief introduction to the key technical flaws in the current researches will be made and the future outlook of frontier directions will be discussed.

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Section: Reasonable Grounding and Minimizing The Electric Fieldmentioning

confidence: 99%

Electrical bearing failures in electric vehicles

2020

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“…A lateral two-dimensional electron gas (2DEG) channel has high electron mobility on AlGaN/GaN heteroepitaxy, which enables fast switching transients with a low capacitance property. To utilize these advantages, recently, AC motor drive systems with WBG devices have been studied [4][5][6][7][8][9][10][11]. In ref.…”

Section: Introductionmentioning

confidence: 99%

“…The fabricated system has a power density of 0.71 kW/L, drive efficiency of 98 %, and motor efficiency of 96.6 % [8]. The factors that degrade the switching properties of SiC devices in pulse-width modulation (PWM) inverter-fed induction motor drive are presented in [9], and the phenomenon of shaft voltage rising due to fast switching is studied in [11].…”

Section: Introductionmentioning

confidence: 99%

GaN-based Matrix Converter Design with Output Filters for Motor Friendly Drive System

Cho

2020

Energies

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This paper introduces a gallium nitride (GaN) high electron mobility transistor (HEMT)-based matrix converter for motor friendly drive systems. A fast switching characteristic of the GaN devices causes high dv/dt. This increases the importance of noise immunity and the reduction of parasitic components in system design. In addition, the high dv/dt in motor drive systems leads to voltage spike at a motor input terminal and leakage current through a motor chassis. Accordingly, a gate drive circuit consists of devices with a high common mode transient immunity. A printed circuit board was designed to minimize parasitic inductance, which was analyzed by performing simulations. To mitigate the dv/dt of the voltage applied to the motor and the leakage current, a dv/dt filter and a sine-wave filter were utilized as an output filter of the matrix converter. The effectiveness of each filter was verified by driving an induction motor.

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“…As a consequence, CMV-derived issues will become more prevalent, as the faster switching will introduce faster CMV variations over time (dv/dt) [9][10][11]20].Considering all the previous, mitigation of CMV in electric drives has become a relevant research topic for the scientific community and the industry [6,7,[21][22][23]. In this context, the inclusion of dedicated filters (passive or active) [21,23,24] and the implementation of specific modulation techniques [21,[24][25][26] are widespread CMV reduction solutions.Alternatively, it is possible to use specific power conversion topologies (derivatives from the conventional two-level three-phase inverter topology) to achieve the same goals. For example, multilevel converters offer a high number of switching states (or degrees of freedom) that can be used to reduce or eliminate CMV [7,[27][28][29].…”

mentioning

confidence: 99%

“…Considering all the previous, mitigation of CMV in electric drives has become a relevant research topic for the scientific community and the industry [6,7,[21][22][23]. In this context, the inclusion of dedicated filters (passive or active) [21,23,24] and the implementation of specific modulation techniques [21,[24][25][26] are widespread CMV reduction solutions.…”

mentioning

confidence: 99%

Mitigation of Common Mode Voltage Issues in Electric Vehicle Drive Systems by Means of an Alternative AC-Decoupling Power Converter Topology

et al. 2019

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Electric vehicles (EV) are gaining popularity due to current environmental concerns. The electric drive, which is constituted by a power converter and an electric machine, is one of the main elements of the EV. Such machines suffer from common mode voltage (CMV) effects. The CMV introduces leakage currents through the bearings, leading to premature failures and reducing the propulsion system life cycles. As future EV power converters will rely on wide bandgap semiconductors with high switching frequency operation, CMV problems will become more prevalent, making the research on CMV mitigation strategies more relevant. A variety of CMV reduction methods can be found in the scientific literature, such as the inclusion of dedicated filters and the implementation of specific modulation techniques. However, alternative power converter topologies can also be introduced for CMV mitigation. The majority of such power converters for CMV mitigation are single-phase topologies intended for photovoltaic applications; thus, solutions in the form of three-phase topologies that could be applied to EVs are very limited. Considering all these, this paper proposes alternative three-phase topologies that could be exploited in EV applications. Their performance is compared with other existing proposals, providing a clear picture of the available alternatives, emphasizing their merits and drawbacks. From this comprehensive study, the benefits of a novel AC-decoupling topology is demonstrated. Moreover, an adequate modulation technique is also investigated in order to exploit the benefits of this topology while considering a trade-off between CMV mitigation, efficiency, and total harmonic distortion (THD). In order to extend the results of the study close to the real application, the performance of the proposed AC-decoupling topology is simulated using a complete and accurate EV model (including vehicle dynamics and a detailed propulsion system model) by means of state-of-the-art digital real-time simulation.Energies 2019, 12, 3349 2 of 27 the commutations of the power converter devices generate significant high-frequency CMV variations (Figure 1a). As a result, these voltage variations can produce not only high electromagnetic interferences (EMI) [6][7][8], but also shaft voltages (Figure 1b) in the electric machine [9][10][11], producing new capacitive paths [10]. These paths result in high-frequency leakage currents (Figure 1c) circulating through the motor bearings [12][13][14]. The most relevant capacitive paths are depicted in Figure 2, where the most significant bearing currents produced by CMV are the capacitive currents, electrostatic discharge currents, circulating currents, and rotor ground currents [9,13]. As bearings are critical components for the electric machine [10], a number of industrial companies are currently analyzing the degradation problems generated by such bearing currents [15][16][17].Regarding this issue, it is important to remark that although the majority of current industrial solutions rely on silicon-bas...

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Analysis and Suppression of Shaft Voltage in SiC-Based Inverter for Electric Vehicle Applications

Cited by 51 publications

References 19 publications

Electrical bearing failures in electric vehicles

Electrical bearing failures in electric vehicles

GaN-based Matrix Converter Design with Output Filters for Motor Friendly Drive System

Mitigation of Common Mode Voltage Issues in Electric Vehicle Drive Systems by Means of an Alternative AC-Decoupling Power Converter Topology

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