One-phase short-circuit fault-tolerant direct torque control method for five-phase permanent magnet motor

Abstract

The invention discloses a one-phase short-circuit fault-tolerant direct torque control method of a five-phase permanent magnet motor. When an open-circuit fault occurs in phase A, according to the constraint conditions that the stator flux vector remains unchanged before and after the fault, the sum of the non-fault phase currents is zero, and the copper consumption is the smallest, the non-fault phase open-circuit fault-tolerant current and fault-tolerant transformation matrix of the fault-tolerant operation of the motor are derived T 4 / 2 and its inverse matrix T 2 / 4 ; When a short-circuit fault occurs in phase A, according to the constraint conditions that the stator flux vector remains unchanged before and after the fault, the principle of minimum copper loss or the compensation current amplitude of the non-fault phase is equal, and the sum of the compensation current of the remaining non-fault phase is zero, the remaining non-fault Fault phase compensation flux linkage; combined with stator flux linkage and torque observer, given torque and stator flux amplitude, and coordinate transformation to obtain stator phase voltage command, the voltage is realized by combining pulse width modulation technology based on zero-sequence voltage injection The steady-state performance and dynamic performance are consistent before and after the short-circuit fault of the motor, and the switching frequency of the inverter is constant, and the CPU overhead is small.

Description

technical field [0001] The invention relates to a direct torque fault-tolerant control method for a one-phase short-circuit fault of a permanent magnet motor, in particular to a fault-tolerant direct torque control method for a five-phase permanent magnet motor, which can be applied in aerospace, electric vehicles, etc., and has important effects on motor reliability and dynamic performance occasions with strict requirements. Background technique [0002] With the improvement of the level of social development, the means of transportation are also undergoing tremendous changes. For example, the emergence of electric vehicles can greatly reduce energy consumption and reduce environmental pollution. At the same time, the technical standards of electric vehicles are becoming more and more stringent. As one of the most important components of an electric vehicle, its steady-state performance and dynamic performance under fault conditions directly determine the reliability of the...

AI Technical Summary

Problems solved by technology

So far, no literature has proposed a fault-tolerant control method based on direct torque for one-phase short-circuit faults of five-phase permanent magnet motors.

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