Fault-tolerant control method for power tube open-circuit fault in electric drive system

A technology for electric drive systems and open circuit faults, applied in motor control, motor generator control, AC motor control, etc., can solve the problems of large number of power switch tubes, insufficient overall capacity-to-power ratio, and many independent power sources, etc., to achieve diagnosis Fast speed, not easy to misjudgment, simple calculation effect

CN111740676BActive Publication Date: 2021-06-15南京众科汇电气科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-06-15

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Abstract

The invention discloses a fault-tolerant control method for an open-circuit fault of a power tube of an electric drive system. This method first uses the mathematical model of gray prediction to judge whether there is a fault, and then detects the current value at 3T / 4 and T / 2 from the beginning of the fault to judge the fault location, and finally adopts the corresponding control strategy according to the fault location to realize the electric drive Fault-tolerant operation of the system. The invention has the characteristics of high reliability, fast diagnosis speed, no misjudgment, no need for additional sensors, and can realize the fault-tolerant control of the system in eight different power tube open-circuit fault states by controlling the inverter and the bidirectional thyristor , with strong fault tolerance.
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Description

technical field

[0001] The invention relates to the field of control methods of an electric drive system, in particular to a fault-tolerant control method for an open circuit fault of a power tube of the electric drive system. 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, in...

Examples

Embodiment Construction

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative efforts belong to the protection scope of the present invention.

[0037] Such as figure 1 As shown, the electric drive system power tube open-circuit fault fault-tolerant control method, the electric drive system includes a double-winding permanent magnet motor, two sets of independent three-phase bridge inverters, two bidirectional thyristors TR1 and TR2, two capacitors C1 and C2, a DC power supply Udc, a cycle calculator, a gray predictive open-circuit fault diagnostic device, a power tube open-circuit fault locator and a power tube open-circuit fault processor, in ...