Method for identifying the abnormal health state of IGBT power module of wind power converter

Abstract

The invention relates to a method for identifying the abnormal health state of an IGBT power module of a wind power converter, and belongs to the technical field of wind turbine generator state monitoring. The method comprises three parts including a wind power converter monitoring data extraction part, an IGBT temperature prediction part, and a residual analysis and abnormal result identificationpart. On the basis of extracting historical operation data of various physical characteristic quantities such as active power and IGBT temperature in a wind turbine generator SCADA system, the activepower is taken as an interval division basis, and the interval division of the historical operation data of the various physical characteristic quantities is realized by utilizing a bin method, so that a process memory matrix is formed; the various extracted physical characteristic quantities are taken as observation vectors, and a nonlinear state estimation method is adopted to realize prediction of the IGBT temperature; and the actual monitoring value of the IGBT temperature is combined with the predicted value to obtain a residual error, and when the residual error value exceeds a threshold value, an abnormal result is given.

Description

technical field [0001] The invention belongs to the technical field of wind power unit state monitoring, and relates to a method for identifying an abnormal health state of an IGBT power module of a wind power converter. Background technique [0002] Wind power plays an important role in the future energy system, and the safe and reliable operation of wind turbines is crucial to the healthy development of the wind power industry. Almost all of the existing high-power grid-connected wind turbines use power electronic converters. Due to the complex operating environment and special operating conditions, the reliability of wind power converters is becoming the focus of the industry. The IGBT module is a key component of energy conversion in wind power converters. However, the long-term, frequent and large-scale random output changes of wind turbines lead to continuous severe thermal stress shocks during power conversion, resulting in high failure rates. At present, there are ...

AI Technical Summary

Problems solved by technology

For example, some studies carried out accelerated aging experiments on IGBT chips to record the relationship between the conduction voltage drop, junction temperature and the number of bonding wires during the process of the bonding wires falling off one by one, providing an important basis for realizing online accurate monitoring of the state of the bonding wires , however, as the degree of bond wire shedding increases, the conduction voltage drop gradually increases but the increment is small, which is difficult to monitor

To sum up, it can be seen that the above method is still difficult to apply in practice and engineering application is difficult, and it is impossible to realize the abnormal identification of the IGBT power module of the wind power converter

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