A fault-tolerant control method for open-circuit faults in electric drive systems based on gray prediction theory

Abstract

The invention discloses a fault-tolerant control method for an open-circuit fault of an electric drive system based on gray prediction theory. This method first uses the mathematical model of gray prediction to predict the current value at the next moment, and then uses the gray prediction open circuit fault diagnostic device to make a difference between the predicted data and the original data and compare it with the set threshold to determine whether there is a fault and The position of the faulty winding is judged by the feedback fault signal, and finally the winding open circuit fault processor adopts the corresponding control strategy according to the fault position to realize the fault-tolerant operation of the electric drive system. The invention has the characteristics of high reliability, fast diagnosis speed, no misjudgment, no need for additional sensors, and the fault-tolerant control of the system in eight different winding open-circuit fault states can be realized by controlling the inverter and the bidirectional thyristor. Has strong fault tolerance.

Description

technical field [0001] The invention relates to the field of control methods for electric drive systems, in particular to an open-circuit fault-tolerant control method for electric drive systems based on gray prediction theory. Background technique [0002] With the development of multi-electric, all-electric aircraft and hybrid and pure electric vehicles, the motor drive system has ushered in new development opportunities and challenges. In addition to requiring high power density and high efficiency, it also needs to have high output performance and high reliability. performance, which has become the key to the motor drive system. However, when the electric drive system fails, the motor will run asymmetrically, and the output torque will pulsate, resulting in large mechanical noise, which will lead to the decline of the overall performance of the system, especially the greatly reduced output power, or even malfunction, seriously endangering the The safety of the system, i...

AI Technical Summary

Problems solved by technology

However, the existing fault-tolerant electric drive system still faces problems such as a large number of independent power supplies, a large number of power switch tubes, and an insufficient overall capacity-to-power ratio. There is still a lot of room for improvement in the ability

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