Wind power converter IGBT module junction temperature online computing method

A technology of wind power converter and calculation method, which is applied to wind power generation, electrical components, output power conversion devices, etc., and can solve problems such as errors, difficult real-time online calculation of IGBT module junction temperature, and large device junction temperature calculation.

Active Publication Date: 2014-07-30
CHONGQING UNIV +1
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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 powe

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  • Wind power converter IGBT module junction temperature online computing method
  • Wind power converter IGBT module junction temperature online computing method
  • Wind power converter IGBT module junction temperature online computing method

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Embodiment Construction

[0048] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0049] figure 1 It is a flow chart of the method of the present invention, as shown in the figure, the purpose of the present invention is to provide an online calculation method for the junction temperature of the IGBT module of the wind power converter based on the analysis of the switching cycle loss, the method is considering the electrothermal coupling characteristics of the IGBT module Under the premise of the wind power converter, based on the real-time operating parameters under the switching cycle, the online calculation of the IGBT module junction temperature is carried out, which specifically includes the following steps:

[0050] S1: Use the data sheet provided by the manufacturer to obtain the loss parameters of the IGBT module. That is, the initial saturation voltage drop and on-state resistance v of the IGBT (or Diode) at 25...

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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. [...

Claims

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Application Information

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IPC IPC(8): H02M1/00
CPCY02E10/76
Inventor 李辉秦星刘盛权杨东李洋陈耀君季海婷孟黎刘志祥梁媛媛
Owner CHONGQING UNIV
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