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课程简介

Power electronics is the key component to ensure an efficient and sustainable electric production and consumption.  It is used in order to adjust renewable energy sources like wind and solar to the grid frequency as well as to supply the right frequency for the speed control of a drive train.  Exact compliance to the limit temperatures is mandatory in order to avoid thermo-mechanical stresses, which would dramatically shorten the life expectancy of the materials.  Efficient cooling is indispensable in order to achieve the highest power density with the least amount of space.

On-Shore wind power stations are mostly operated with a double-fed asynchronous generator with slip-ring rotor.  The rotor winding is supplied with low frequencies between 0 and 10 Hz with the help of a frequency converter.  This allows despite load changes due to the change of the wind velocity, the generation of power with the network frequency.  The switch losses and the resulting heating of the transistors can be assumed to be constant over the time for a frequency of 50 Hz or more.  For low frequencies, between 0.1 and 10 Hz the switching of the transistor is so slow that it induces a time dependency of the transistor temperatures.  In this webinar, stationary calculations of the inverter module will be presented for the 50 Hz application and compared with test results.  Transient calculations for low frequencies will also be presented. 

课程目标

After an introduction of the frequency converter for this specific application, 3D FloEFD thermal calculations of the IGBT-Transistor modules will be presented and compared with test results.

课程目录

Why frequency converters need cooling

How to input the electrical losses in a FloEFD model

Why the thermal resistance of the Thermal Interface Materials matters 

How to set-up a transient case for low frequencies

Why FloEFD is well adapted for the thermal design of power electronics

课程时长：0.4h

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