Thermal profile analysis of Doubly-Fed induction generator based wind power converter with air and liquid cooling methods

Today, wind power generation system keeps on moving from onshore to offshore and also upscaling in size. As the lifetime of the wind power converter is prolonged to 20-25 years, this paper will investigate and compare different cooling methods for power modules - the air cooling and the liquid cooling seen from a thermal profile assessment point of view. Firstly, an analytical approach from loss profile to thermal profile for the power semiconductor is proposed and verified in a 2 MW Doubly-Fed Induction Generator (DFIG) based wind turbine system. Then, the typical air cooling and liquid cooling in wind power converter are analyzed and compared in terms of the mean junction temperature and the junction temperature fluctuation. It is concluded that the liquid cooling approach has a similar junction temperature fluctuation but gives a lower mean junction temperature than the air cooling approach.

[1]  Frede Blaabjerg,et al.  Multilevel converters for 10 MW Wind Turbines , 2011, Proceedings of the 2011 14th European Conference on Power Electronics and Applications.

[2]  F. Blaabjerg,et al.  Thermal behavior optimization in multi-MW wind power converter by reactive power circulation , 2013, 2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[3]  T. Ueta,et al.  A Fast Loss and Temperature Simulation Method for Power Converters, Part I: Electrothermal Modeling and Validation , 2012, IEEE Transactions on Power Electronics.

[4]  Xu Cai,et al.  Evaluation of the mainstream wind turbine concepts considering their reliabilities , 2012 .

[5]  Frede Blaabjerg,et al.  Thermal Cycling Overview of Multi-Megawatt Two-Level Wind Power Converter at Full Grid Code Operation , 2013 .

[6]  Frede Blaabjerg,et al.  Design for reliability of power electronic systems , 2012, IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society.

[7]  Yantao Song,et al.  Survey on Reliability of Power Electronic Systems , 2013, IEEE Transactions on Power Electronics.

[8]  F. Blaabjerg,et al.  Power electronics as efficient interface in dispersed power generation systems , 2004, IEEE Transactions on Power Electronics.

[9]  W. Hofmann,et al.  Investigation of thermal stress in the rotor of Doubly-Fed Induction Generators at synchronous operating point , 2011, 2011 IEEE International Electric Machines & Drives Conference (IEMDC).

[10]  S. Waffler,et al.  Performance trends and limitations of power electronic systems , 2010, 2010 6th International Conference on Integrated Power Electronics Systems.