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| Losses Calculation and Heat Dissipation Analysis of High-Power Three-Level Converters |
| Jing Wei, Tan Guojun, Ye Zongbin |
| China University of Mining and Technology Xuzhou 221008 China |
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Abstract Thermal design of the converter can be optimized if the power losses are precisely known. The device’s conduction and switching characteristics are very sensitive to the temperatures, so the influence of junction temperatures must be taken into consideration when calculating the power losses. In this paper, a practical loss calculation method is derived based on the analysis of the conduction and switching principles of the neutral point clamping three-level converters. Using thermal resistance equivalent circuit, the devices junction temperatures are acquired. An 1MVA NPC converter is tested in inverter and rectifier operating modes, and the infrared thermal imager is used to measure the devices temperatures. The error rates between measured and calculated temperatures are within 5% range and thus the validity of the loss calculation method is verified.
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Received: 11 June 2010
Published: 07 March 2014
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2011, Vol. 26 
