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

Amr. S. Zalhaf, Mazen Abdel-Salam and Mahmoud Ahmed
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Amr. S. Zalhaf: Energy Resources Engineering Department, Egypt-Japan University of Science and Technology (E-JUST), Alexandria 21934, Egypt
Mazen Abdel-Salam: Electrical Engineering Department, Assiut University, Assiut 71516, Egypt
Mahmoud Ahmed: Energy Resources Engineering Department, Egypt-Japan University of Science and Technology (E-JUST), Alexandria 21934, Egypt

Energies, 2019, vol. 12, issue 4, 1-12

Abstract: 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.

Keywords: common-mode voltage; doubly-fed induction generators; pulse-width modulated converters; bearing currents (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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