Proceedings ArticleDOI
Interaction of drive modulation and cable parameters on AC motor transients
Russel J. Kerkman,David Leggate,Gary L. Skibinski +2 more
- Vol. 1, Iss: 3, pp 143-152
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TLDR
Novel modifications to the PWM modulator as well as external hardware apparatus are proposed solutions to the >2 pu overvoltage problem, both are simulated and experimentally confirmed.Abstract:
This paper investigates overvoltage transients on AC induction motors when connected through a cable of arbitrary length to a variable frequency drive (VFD) consisting of a pulsewidth modulation (PWM) inverter with insulated gate bipolar transistor (IGBT) power devices. Factors contributing to a motor overvoltage transient equal to a theoretical twice DC bus voltage are first described using existing transmission line analysis. A critical cable distance I/sub c/ is defined where this 2-pu overvoltage occurs. However, literature is lacking on flow motor voltage transients >2-pu bus voltage and up to 3-4 pu are generated. This phenomenon is observed on all PWM inverters with output cable lengths greater than l/sub c/ distance. Contributing factors to the >2-pu overvoltage phenomenon are investigated by exploring the complex interaction between drive modulation techniques, carrier frequency selected, cable natural frequency of oscillation, cable high-frequency damping losses, and, to a lesser extent, inverter output rise time. Theoretical calculations of cable frequency and damping are correlated with simulation and experimental results. Novel modifications to the PWM modulator, as well as external hardware apparatus, are proposed solutions to the >2-pu overvoltage problem; both are simulated and experimentally confirmed.read more
Citations
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EMI emissions of modern PWM AC drives
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Carrier-based PWM-VSI overmodulation strategies: analysis, comparison, and design
TL;DR: In this paper, the overmodulation region voltage-gain characteristics and waveform quality of carrier-based pulsewidth-modulated (PWM) methods are investigated and the influence of blanking time and minimum pulsewidth (MPW) control on the inverter gain characteristics are studied and shown to be significant.
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High-frequency modeling for cable and induction motor overvoltage studies in long cable drives
TL;DR: In this paper, the authors used several lumped segments incorporating a lossy representation of the line are used to model the cable and induction motor models may be implemented using MATLAB, thereby providing a convenient method to analyze the overvoltage phenomena.
References
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Proceedings ArticleDOI
Transient effects in application of PWM inverters to induction motors
TL;DR: In this paper, the effect of nonsinusoidal wave-shapes when supplied from adjustable-frequency inverters on the insulation properties of SCI motors is investigated and voltage reflections are simulated for various cable lengths and risetimes.
Journal ArticleDOI
Design considerations for an inverter output filter to mitigate the effects of long motor leads in ASD applications
A. von Jouanne,Prasad Enjeti +1 more
TL;DR: In this article, a low-pass filter at the inverter output terminals to reduce the dv/dt of the PWM output pulse is presented. But the performance of the filter is evaluated through simulations and experimentally on a 460 V commercially available AC motor drive (PWM insulated gate bipolar transistor (IGBT)).
Proceedings ArticleDOI
Filtering techniques to minimize the effect of long motor leads on PWM inverter-fed AC motor drive systems
TL;DR: It is demonstrated that a second-order shunt filter connected at the motor terminals greatly reduces the overvoltage stress and ringing, and also lowers the dv/dt of the PWM switching pulse.
Proceedings ArticleDOI
The effect of long motor leads on PWM inverter fed AC motor drive systems
TL;DR: In this article, the effect of long motor leads on high frequency PWM inverter fed AC motor drives is examined and a flexible computer model is developed and the analysis is confirmed by simulations and verified by experimental results from case studies.