Fault-tolerant control method for two-phase open-circuit fault of five-phase permanent magnet synchronous motor based on SVPWM (Space Vector Pulse Width Modulation)

Abstract

The invention discloses a fault-tolerant control method for a two-phase open-circuit fault of a five-phase permanent magnet synchronous motor based on SVPWM (Space Vector Pulse Width Modulation), which comprises the step that the algorithm calculates to obtain a corresponding voltage space vector through constructing a reduced-order matrix after the fault. The synthesis of a reference vector is realized by the division of six sectors and the reconstruction of six non-zero voltage vectors. The fault-tolerant control method is similar to the control of a three-phase motor under normal working conditions, is simple to calculate and easy to implement. The fault-tolerant control method can greatly reduce the torque ripple caused by an open-circuit fault of a stator winding while ensuring the average torque, enables the five-phase PMSM (Permanent Magnet Synchronous Motor) to be obviously improved in operation performance under the fault state, and effectively improves the reliability of a speed regulation system. Simulation and experimental results show that high-quality operation of a five-phase motor driving system under the two-phase open-circuit fault can be realized by adopting thefault-tolerant control strategy.

Description

technical field [0001] The invention relates to the technical field of multi-phase motor fault-tolerant control, in particular to a control method based on a five-phase permanent magnet 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] Compared with the traditional three-phase motor, the five-phase permanent magnet synchronous motor has the advantages of high power density, high efficiency, high reliability, etc., and has very broad application prospects in the fields of aerospace, wind power generation, ship propulsion, and electric vehicles. . [0003] In recent years, universities and scientific research institutions at home and abroad have also carried out in-depth research on the fault-tolerant control strategy of five-phase permanent magnet motors, and achieved certain results. Chinese invention patent "fault-tolerant control me...

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Problems solved by technology

Chinese invention patent "fault-tolerant control method of five-phase flux switching motor based on the principle of minimum copper loss" (patent number CN201410492490.1) discloses a fault-tolerant control method of five-phase flux switching motor based on the principle of minimum copper loss, when the system In the event of a phase loss fault, keep the electromagnetic torque constant, and calculate the fault-tolerant current formula of the non-faulted phase under the condition of minimum copper loss, but this method is based on the control method of the current hysteresis loop, and the current hysteresis loop has high switching loss, current Volatility problem

The Chinese invention patent "A Full Vector Control Method for Five-Phase Fault-Tolerant Permanent Magnet Motor" (Patent No. CN201510568331.X) discloses a full vector control method for a five-phase permanent magnet motor. After the reconstruction of the space vector, the vector control is performed, but this method is not suitable for the case of two-phase open circuit

Chinese invention patent "five-phase permanent magnet embedded fault-tolerant linear motor adjacent two-phase open-circuit fault-tolerant vector control method" (patent number CN201610592151.X) and Chinese invention patent "five-phase permanent magnet embedded fault-tolerant linear motor is not adjacent Two-phase open-circuit fault-tolerant vector control method" (Patent No. CN201610596174.8) proposes a fault-tolerant vector control method for the two-phase open-circuit situation. Although the fault-tolerant control effect is achieved, the control structure is relatively complicated

At present, most commonly used fault-tolerant control methods are based on hysteresis control, and most of them focus on the research of single-phase open circuit of five-phase motors, and there are few studies on two-phase open circuit.

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