Line Filter Design of Parallel Interleaved VSCs for High-Power Wind Energy Conversion Systems

The voltage source converters (VSCs) are often connected in parallel in a wind energy conversion system to match the high power rating of the modern wind turbines. The effect of the interleaved carriers on the harmonic performance of the parallel connected VSCs is analyzed in this paper. In order to...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2015-12, Vol.30 (12), p.6775-6790
Main Authors: Gohil, Ghanshyamsinh, Bede, Lorand, Teodorescu, Remus, Kerekes, Tamas, Blaabjerg, Frede
Format: Article
Language:English
Subjects:
discontinuous pulse-width modulation (DPWM)
Experiments
filter design
Harmonic analysis
Inductors
interleaving
Modulation
Optimization
parallel
Power conversion
Power system harmonics
Switches
Switching
trap filter
Turbines
Voltage source converters (VSC)
Wind power
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Summary:The voltage source converters (VSCs) are often connected in parallel in a wind energy conversion system to match the high power rating of the modern wind turbines. The effect of the interleaved carriers on the harmonic performance of the parallel connected VSCs is analyzed in this paper. In order to achieve low-switching losses, the 60° clamp discontinuous pulsewidth modulation (DPWM1) is used to modulate the VSCs. A step-by-step design procedure of the line filter, which ensures the desired harmonic performance under all operating conditions, is presented. The analytical harmonic solution for the two parallel interleaved VSCs is derived in order to obtain the worst case voltage magnitude of the individual harmonic components. The required value of the filter admittance for the specific harmonic component is obtained by using the worst case voltage magnitude and the allowable harmonic injection limit. In order to achieve the desired filter performance with optimal values of the filter parameters, the use of an LC trap branch with the conventional LCL filter is proposed. The expressions for the resonant frequencies of the proposed line filter are derived and used in the design to selectively choose the values of the line filter components. The analysis and design methodology are also verified experimentally.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2015.2394460