Converter of fan, and junction temperature monitoring method and device of IGBT module

Abstract

The invention provides a converter of a fan, and a junction temperature monitoring method and device of an IGBT module. The junction temperature monitoring method of the IGBT module comprises the steps: a forward peak current of the IGBT module, the power factor of the IGBT module, the modulation ratio of the IGBT module, the switching frequency of the IGBT module, and an estimated value of the current junction temperature of the IGBT module are obtained; the conduction loss of the IGBT module and the switching loss of the IGBT module are calculated according to the forward peak current of theIGBT module, the power factor of the IGBT module, the modulation ratio of the IGBT module, the switching frequency of the IGBT module, and the estimated value of the current junction temperature of the IGBT module; and the junction temperature of the IGBT module is calculated according to the conduction loss of the IGBT module, the switching loss of the IGBT module and the shell temperature of the IGBT module. By adopting the technical scheme, the accuracy degree of a junction temperature monitoring result can be increased.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a converter of a wind turbine and a junction temperature monitoring method and device of an IGBT module. Background technique [0002] The IGBT module is the core device in the power component of the converter of the wind power generating set (hereinafter referred to as the wind turbine), which can rectify and invert the three-phase alternating current output by the wind turbine through high-frequency switching. As the speed of the fan increases, the amplitude and frequency of the AC side current of the power component gradually increase, which causes the junction temperature of the IGBT module to rise rapidly. When the junction temperature of the IGBT module is too high, it will cause damage to the IGBT module. Therefore, when the power component is working, it is necessary to monitor the junction temperature of the IGBT module in real time to implement over-temper...

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Problems solved by technology

[0004] However, since the junction temperature-case temperature fitting curve is related to multiple operating parameters such as water cooling liquid temperature, switching frequency, output current frequency, modulation ratio and bus voltage of the power component, when one of the operating parameters changes, the junction temperature- The case temperature fitting curve will no longer be applicable, resulting in a decrease in the accuracy of the junction temperature monitoring results. side (the current frequency is 5Hz-9.45Hz) will no longer be applicable, that is, on the side of the converter, the junction temperature value obtained by using the method in the prior art and the actual junction temperature value have a large deviation

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