By Ke Ma
This publication offers fresh reports at the strength electronics used for the following new release wind turbine process. a few standards and instruments for comparing and bettering the severe performances of the wind strength converters were proposed and verified. The e-book addresses a few rising difficulties in addition to probabilities for the wind energy conversion, and should be beneficial as an inspiring reference for the researchers during this field.
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Extra info for Power Electronics for the Next Generation Wind Turbine System
Sample text
5L-HB BTB can achieve five-voltage-level output, and doubled voltage amplitude compared to the 3L-HB BTB solution with the same Transformer (open windings) Filter Filter 5L-HB 5L-HB Fig. 1 Comparison of three multilevel power converters for wind turbines IGBT numbers Diode numbers1 Switch current Switch voltage Max. 73 Standard Open winding Open winding No Yes Yes Matured technology Less DC link capacitors, equal loss distribution Zero-sequence current path, more cables More output voltage levels, higher voltage utilization of device5 Zero-sequence current path, more cables and devices Unequal loss distribution, DC bus midpoint Notes 1.
The first one is used for junction temperature estimation and the second one is used for case and heat sink temperature estimation. When applying the proposed thermal model to a designed 1-MW grid side converter in Chap. 2 Classification and Approach for the Thermal Stress Analysis Tj Loss 41 TA Pin IGBT module multi-layers Foster Zj-c TC IGBT module Pout TH TA Thermal Grease Heat sink equivalent 1 layer Cauer Zj-c Zc-h+Zh-a Fig. 11 Proposed thermal model of power devices for lifetime evaluation IGBT Pin, power loss output from IGBT base plate Pout, as well as the IGBT junction temperature Tj and case temperature TC are shown in Fig.
5 Hz fundamental frequency, direct driven) in order to get an acceptable switching loss in the power devices at 10-MW power conversion. The grid-side filter design for MW wind power converter has been comprehensively investigated in [15]; a filter inductance is considered in the simulation, and it is designed to limit the maximum current ripple to 25 % of the rated current amplitude. For simplicity and to focus the analysis on the device stress, the filter capacitance is not taken into account; the power grid is considered as three 20 kV/50 Hz ideal AC voltage sources; the resistance in the generator and the cables is not taken into account; DC bus capacitance is assumed high, and the transformers are assumed ideal.