Bearing currents and shaft voltages of an induction motor under hard- and soft-switching inverter excitation

Chen, Shaotang; Lipo, T.Α.

doi:10.1109/28.720444

Cited by 73 publications

(4 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These values are determined by design of resonant circuit parameters and a value and flow direction of the load current I O . PCQRDCLI [12] still contains three inductances, but the inductor L R2 is not coupled with others windings (Fig. 7).…”

Section: Active Clamped Quasi Resonant Dc-link Inverter (Acqrdcli)mentioning

confidence: 99%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Turzyński¹,

Chrzan²

2019

View full text Add to dashboard Cite

In this survey paper, resonant and quasiresonant DC link inverters are reexamined for AC motor drive applications. Critical evaluation of representative topologies is based on simulation and waveform analysis to characterize current/voltage stress of components, control timing constraints and feasibility. A special concern over inverter common-mode voltage and voltage gradient du/dt limitation capacity is discussed for motor bearing and winding insulation safety. Experimental records of the laboratory developed parallel quasiresonant DC link inverter feeding induction motor confirm results of analysis. Comparative tables and simulation results demonstrate characteristic features of various schemes.

show abstract

Section: Active Clamped Quasi Resonant Dc-link Inverter (Acqrdcli)mentioning

confidence: 99%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Turzyński¹,

Chrzan²

2019

View full text Add to dashboard Cite

show abstract

“…This will allow significantly increasing the operating switching frequencies when compared to conventional insulated gate bipolar transistor (IGBT) based Si technologies. 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.…”

mentioning

confidence: 99%

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

View full text Add to dashboard Cite

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...

show abstract

“…Hay un amplio número de estudios cientícos que han realizado disertaciones sobre el efecto de las corrientes de fuga en los motores [47,48,49,50,57,58,59,60]. Dos de sus principales consecuencias son el deterioro del material aislante de las bobinas del estátor y la destrucción de los cojinetes.…”

Section: Antecedentesunclassified

Estudio e implementación de nuevas técnicas de modulación para la reducción de perturbaciones EMI en convertidores matriciales

Espina Masramon

View full text Add to dashboard Cite

El procesamiento de la energía mediante convertidores electrónicos conmutados ha tomado una relevancia notable durante la última década, y presumiblemente será uno de los campos de la ingeniería con mayor proyección industrial en el futuro. La evolución continua en el campo de la electrónica de potencia ha hecho posible la fabricación de convertidores conmutados cada vez más compactos, capaces de manejar valores de tensión y corriente mayores, conmutando a frecuencias más elevadas. Estas mejoras provocan, a su vez, la generación de perturbaciones electromagnéticas (EMI) fuera del rango permitido por la legislación vigente. Por otro lado, el diseño convertidores con nuevas topologías y una legislación cada vez más restrictiva en cuanto a emisiones EMI se refiere, hace imprescindible la elaboración de nuevas herramientas capaces de analizar los efectos que de las EMI generadas se puedan derivar. Uno de los convertidores de potencia emergentes y que actualmente está adquiriendo especial relevancia es el Convertidor Matricial (MC). El auge del interés por esta topología durante los últimos años ha sido motivado gracias a prestaciones como la conversión directa AC/AC, su gran densidad de potencia y la ausencia de grandes componentes reactivos para el almacenaje de energía. El trabajo que se presenta en este documento trata de dar cobertura al estudio y la reducción de las EMI generadas por los MC. Esta tesis doctoral se ha dividido en dos líneas de investigación: Estudio de las perturbaciones EMI producidas por los MC y prevención de efectos adversos producidos por dichas EMI. La primera línea de investigación ha tenido como objetivo principal el estudio de las EMIs generadas por los MC de topología directa. En dicho estudio se ha desarrollado un modelo EMI para poder predecir las perturbaciones conducidas generadas por dichos convertidores. Uno de los objetivos principales de dicho modelo es proporcionar aproximaciones suficientemente válidas en un tiempo reducido. La estrategia utilizada ha sido el cálculo de las perturbaciones conducidas clasificando estas en modo común (CM) y modo diferencial (DM). El método utilizado se basa en la extracción de circuitos de impedancias equivalentes que proporcionen una representación fidedigna de la generación y propagación de las perturbaciones sin necesidad de complejos sistemas de cálculo. La segunda línea de investigación ha tenido como objetivo reducir el número de descargas eléctricas que se producen en los cojinetes del motor, las cuales son una de las causas principales de la reducción de su vida útil. Estas descargas son debidas a los niveles de la tensión en modo común (CMV) y sus rápidas variaciones en el tiempo (dv/dt). Para reducir los niveles de la CMV se ha desarrollado una modulación basada en la tradicional Space Vector Modulation (SVM) donde se remplazan los vectores cero, utilizados convencionalmente, por vectores rotativos. Este intercambio de vectores ha demostrado que permite reducir de manera significativa la amplitud del CMV y con ello reducir la probabilidad en la aparición de descargas eléctricas en los cojinetes. Además, en el estudio se analiza la utilización de vectores activos de diferentes amplitudes con el objetivo de mejorar la modulación presentada cuando se utilizan índices de modulación pequeños. The energy processing using power converters has taken a remarkable importance in the last decade, and in the future it might become one of the engineering fields with greater projection. The continuous evolution in the field of power electronics has made possible to manufacture more compact switched converters, capable of managing higher voltage and currents levels switching at higher frequency. These improvements, however, lead to the generation of electromagnetic perturbations (EMI) which fail the electromagnetic regulations. On the other hand, the converter design using new layout topologies and a regulation law that is becoming more restrictive about EMI emissions makes essential to develop new tools capable to analyze the effects of the EMI generated. One of the emerging power converters which is currently acquiring special relevance is the matrix converter (MC). The rise of interest on this topology in recent years has been determined by different aspects, such as direct AC/AC conversion, its high power density and the absence of large reactive components for energy storage. The work presented in this document tries to cover the study and the reduction of EMI generated by the MC. This Phd thesis has divided in two research lines: The study of the EMI produced by MC and the prevention of the adverse effects produced by EMI. The first research line has mainly focused on the study of EMI generated by MC of direct topology. In this study, a model to predict the conducted EMI has been developed. One of the main objectives of this model is to deliver good approximation results in short time. The strategy used has been the conducted perturbation calculation using the classification of the EMI as common mode (CM) and differential mode (DM). The method used is based on extraction of the equivalent impedance circuit. This equivalent circuit provides a true representation of the generation and propagation of EMI without the need of complex mathematical methods. The second research line has mainly focused on the reduction of electric discharges which is produced inside of the motor bearings, which are the main cause of motor life time reduction. These electrical discharges are produced by the common mode voltage (CMV) levels and its fast time transitions (dv/dt). In order to reduce those levels, a new modulation based on the traditional Space Vector modulation (SVM) has been developed replacing the zero vectors, normally used, for the rotating ones. This vector exchange has shown a significant reduction of the CMV amplitude, and therefore the probability of electrical discharge appearing inside the motor drops considerably. Furthermore, the study analyzes the use of the active vectors with smaller amplitude to improve the modulation when small modulation index is used.

show abstract

Bearing currents and shaft voltages of an induction motor under hard- and soft-switching inverter excitation

Cited by 73 publications

References 9 publications

Bulletin of the Polish Academy of Sciences: Technical Sciences

Bulletin of the Polish Academy of Sciences: Technical Sciences

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

Estudio e implementación de nuevas técnicas de modulación para la reducción de perturbaciones EMI en convertidores matriciales

Contact Info

Product

Resources

About