Reduction of Bearing Currents in Doubly Fed Induction Generators

Garcia, A.; Holmes, D.G.; Lipo, T.Α.

doi:10.1109/ias.2006.256488

Cited by 14 publications

(15 citation statements)

References 8 publications

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“…Electrical filters are very effective in common-mode noise prevention in single-converter systems [5][6][7][8][9] . However, in the back-to-back converter, common-mode noise is mainly generated by two sources, one of which, produced by the grid-side converter, is the reference for the other one, produced by the generator-side converter [10][11][12][13] . This is illustrated in Figure 2 for one phase of the three-phase system.…”

Section: Equivalent Electrical Circuitsmentioning

confidence: 99%

Estimation of peak transient voltages at wind turbine generator terminals

2014

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This paper proposes equivalent circuits and a method for the estimation of the peak transient voltages at generator terminals in wind turbines equipped with back‐to‐back converters. Equivalent circuits as well as a way of phase‐to‐phase and phase‐to‐ground voltages estimation in back‐to‐back converter are presented. Proposed theoretical background is well confirmed by small‐scale measurements. It is shown and proven that phase‐to‐ground voltages represent a dominating threat for the wind turbine generators insulation. Copyright © 2014 John Wiley & Sons, Ltd.

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Section: Equivalent Electrical Circuitsmentioning

confidence: 99%

Estimation of peak transient voltages at wind turbine generator terminals

2014

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“…An approach presented in [8] is to constrain the inverter PWM strategy to reduce overall common mode voltages across the rectifier/inverter system, and thus significantly reduce bearing discharge currents. A general common mode model of DFIGs is mentioned in [9] to calculate bearing current. In this paper, mathematical analysis and simulations have been carried out to find the effective parameters on the shaft voltage of grid-connected induction generators.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Shaft Voltage in a Doubly-fed Induction Generator

Adabi¹,

Zare²,

Ghosh³

et al. 2024

RE&PQJ

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Fast switching transients and common mode voltage generated by pulse width modulated voltage in high frequency applications may cause many unwanted problems such as shaft voltage and resultant bearing currents. The main objective of this research work is to analyse shaft voltage generation in a doubly-fed induction generator (DFIG) with a back to back converter. A detailed high frequency model of the proposed system has been developed based on capacitive couplings between different objects of the machine. The proposed model can be used for shaft voltage calculations and finding parameters which have key effect on shaft voltage and resultant bearing currents. A discussion about the presented technique for shaft voltage elimination in existing literature is also presented based on mathematical analysis and simulations.

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“…If the bearing voltage overrides the threshold voltage of the bearing, the lubricating oil-film of the bearing will break down. Therefore, a discharge current due to high-frequency CMV [10][11][12] will flow, resulting in a bearing failure [6,13]. Compared to AC industrial motors, the bearing failure of WT generators is higher [14].…”

Section: Introductionmentioning

confidence: 99%

An Active Common-Mode Voltage Canceler for PWM Converters in Wind-Turbine Doubly-Fed Induction Generators

2019

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Wind energy integration in power grids is increasing day by day to reduce the use of fossil fuels, and consequently greenhouse gas emissions. Using the pulse-width modulated (PWM) power converters in wind turbine generators, specifically in doubly-fed induction generators, results in generating a common-mode voltage (CMV). This common-mode voltage causes a flow of common-mode current (CMC) that leaks through the stray capacitances in the generator structure. These currents impose a voltage on the generator bearing which may deteriorate them. In the current work, an active common-mode voltage canceler (ACMVC) is developed to eliminate the CMV produced by a PWM converter. The ACMVC generates a compensating voltage at the converter terminals to eliminate the CMV with a subsequent reduction of the voltage stress on the generator bearing. This compensating voltage has the same amplitude as CMV, but opposite polarity. A simulation of the ACMVC model is performed using the PSCAD/EMTDC (Electromagnetic Transient Design and Control) software package. Results confirm the effectiveness of ACMVC in canceling not only the CMV but the CMC and bearing voltage as well. In addition, the relationship between the rise time of CMV and the peak value of CMC is investigated.

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Reduction of Bearing Currents in Doubly Fed Induction Generators

Cited by 14 publications

References 8 publications

Estimation of peak transient voltages at wind turbine generator terminals

Estimation of peak transient voltages at wind turbine generator terminals

Analysis of Shaft Voltage in a Doubly-fed Induction Generator

An Active Common-Mode Voltage Canceler for PWM Converters in Wind-Turbine Doubly-Fed Induction Generators

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