Wind power converter IGBT module junction temperature online computing method

Abstract

The invention discloses a wind power converter IGBT module junction temperature online computing method, in particular to a wind power converter IGBT module junction temperature online computing method based on switching period loss analysis. On the premise that an IGBT module electric-heating coupling characteristic is considered, the method utilizes a wind power converter to perform IGBT module junction temperature online computation based on real-time operating parameters in a switching period. On the one hand, loss influence of IGBT module junction temperatures at all of moments can be considered; on the other hand, the influence of IGBT module loss energy and waveforms on junction temperature fluctuation within an output period can be further considered, a dynamic fluctuation junction temperature of an IGBT module can be accurately computed in real time when the output frequency of the wind power converter is low, online integration of IGBT module state monitoring and healthy management is facilitated, and the invalidation risk of the wind power converter is reduced.

Description

technical field [0001] The invention relates to an online calculation method for the IGBT module junction temperature of a wind power converter, in particular to an online calculation method for the IGBT module junction temperature of the wind power converter based on switching cycle loss analysis. Background technique [0002] With the establishment and implementation of my country's "building large bases and centralized access to the network" wind power generation plan, the converter, as a key control channel for wind turbine power feedback to the grid, is an important link that affects the safe and stable operation of high-power wind turbines and grid access . However, due to the long-term, frequent and large-scale random output changes of wind turbines, the junction temperature of the IGBT module of the wind power converter fluctuates frequently, which often leads to frequent failures such as the IGBT module welding wire falling off and the aging of the solder layer. [...

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Problems solved by technology

The above method not only requires detailed device structure parameters, but also is difficult to apply to real-time online calculation of IGBT module junction temperature under different operating conditions

In addition, when the conventional online calculation method of junction temperature based on the analysis of the average loss of the output cycle is applied to the low operating frequency of the wind power converter, there will be a large error in the calculation of the junction temperature of the device; in addition, under different operating conditions of the wind turbine, The converter is still in the switching operation between rectification and inverter operating modes, and the calculation of the junction temperature of its IGBT module should also be closely related to the operating mode of the converter

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