A phase-to-phase short-circuit fault-tolerant control method for five-phase permanent magnet fault-tolerant motors
A permanent magnet fault-tolerant, phase-to-phase short-circuit technology, which is applied in motor control, motor-generator control, electronically commutated motor control, etc., can solve the problem of fault-tolerant control without motor-phase short-circuit faults, and achieve reduced switching losses and low dependence , the effect of reducing calculation errors
Active Publication Date: 2022-05-20
JIANGSU UNIV
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[0005] Traditional short-circuit fault-tolerant control depends on motor parameters, and there is no fault-tolerant control for motor-phase short-circuit faults in the existing literature
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specific Embodiment 1
[0068] Specific embodiment 1, for a five-phase permanent magnet fault-tolerant motor, when a phase-to-phase short-circuit fault occurs, such as figure 1 shown. Due to the existence of the counter electromotive force, a short-circuit current i is generated in the short-circuit circuit sc . At this time, the short-circuit fault-tolerant control block diagram of the system is as follows: figure 2 shown. The specific implementation of this embodiment will be described in detail below in conjunction with the accompanying drawings.
[0069] Step 1. Detect the speed of the five-phase permanent magnet fault-tolerant motor as the feedback speed ω of the motor m , the given speed ω * and feedback speed ω m Comparing the speed error e of the motor r , using PI controller according to the speed error e r Calculate the q-axis current of the five-phase permanent magnet fault-tolerant motor, and the output of the PI controller is a given q-axis current i q ;
[0070] Step 2. Equiv...
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The invention discloses a phase-to-phase short-circuit fault-tolerant control method for a five-phase permanent magnet fault-tolerant motor. The method compensates for the influence of phase loss by constructing a reduced-order transformation matrix in which the torque remains unchanged before and after a fault; and offsets the phase-to-phase short circuit by injecting compensation current current i sc The generated torque ripple; thereby realizing the fault-tolerant operation of the motor in the event of a short-circuit fault. Compared with the traditional fault-tolerant algorithm, the compensation strategy adopted by the present invention is less dependent on motor parameters; through real-time detection of short-circuit current and online calculation of optimal short-circuit fault-tolerant current, the calculation error is greatly reduced, and the dynamics of the system are improved. , Static performance; the PWM modulation method used is carrier-based pulse width modulation CPWM. Compared with the current hysteresis modulation method used in traditional fault-tolerant algorithms, CPWM has a fixed modulation cycle, which can reduce the switching loss of the inverter.
Description
technical field [0001] The invention relates to the technical field of multi-phase motor fault-tolerant control, in particular to an interphase short-circuit fault-tolerant control of a five-phase permanent magnet fault-tolerant motor. It is suitable for occasions that have high requirements on the reliability of motors, such as aerospace, electric vehicles, and ship propulsion systems. Background technique [0002] Due to its high torque density, high efficiency and high reliability, five-phase permanent magnet synchronous motors are more and more widely used in the fields of electric vehicle traction, aerospace and marine cruise systems. At the same time, a stable and reliable motor drive system is particularly important for some occasions that require high reliability, such as aircraft and electric vehicles. Therefore, high-reliability fault-tolerant control methods for permanent magnet motors have received extensive attention. [0003] Due to the existence of permanent...
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IPC IPC(8): H02P29/028H02P21/00
CPCH02P29/028H02P21/0003Y02T10/72
Inventor 陈前顾理成夏雨航赵文祥刘国海
Owner JIANGSU UNIV