Method for controlling life extension of inverter system after demagnetization failure

Abstract

The invention is applicable to the field of operation and maintenance of a permanent magnet driven train, and provides a method for controlling the life extension of an inverter system after a demagnetization failure. A solution to the problem of uneven torque distribution caused by motor demagnetization and a sharp rise in inverter losses is proposed and is divided into two parts of offline modeling simulation as well as real-time monitoring. In the offline hybrid modeling simulation, several different demagnetization conditions are taken to solve the power distribution coefficient that makesthe life of the inverter system as long as possible, and the power distribution coefficient is fitted to the map by a Newton interpolation method. Then, the demagnetization state monitoring is carried out during the traction process of the train, the demagnetization degree of the train and its corresponding power distribution coefficient are obtained in real time through the similarity matching of the simulated state characteristics under different demagnetization and load conditions, thereby extending the overall life of the inverter system on the premise of not obviously influencing the traction performance of the train.

Description

technical field [0001] The invention relates to the field of operation and maintenance of permanent magnet drive trains, in particular to a life extension control method for preventing the demagnetization of a permanent magnet synchronous motor from causing additional damage to inverter components. Background technique [0002] With the continuous development of the rail transit industry, new permanent magnet synchronous motors have been widely used. Although the permanent magnet synchronous motor has the advantages of high power coefficient and low noise, its unique permanent magnet demagnetization fault will have a serious impact on the train. The demagnetization fault of the permanent magnet synchronous motor will cause the output torque of the motor to drop, and the torque distribution of the two motors on the same bogie will change, which will greatly increase the inverter load on the faulty motor side, resulting in inverter The damage of the IGBT components in the inv...

AI Technical Summary

Problems solved by technology

Although the permanent magnet synchronous motor has the advantages of high power coefficient and low noise, its unique permanent magnet demagnetization fault will have a serious impact on the train

The demagnetization fault of the permanent magnet synchronous motor will cause the output torque of the motor to drop, and the torque distribution of the two motors on the same bogie will change, which will greatly increase the inverter load on the faulty motor side, resulting in inverter The damage of IGBT components in the inverter increased sharply, causing hidden dangers in the operation process

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