Adaptive fault-tolerant control system and method for rotary transformer of PMSM driving system

Abstract

The invention discloses an adaptive fault-tolerant control system and method for a rotary transformer of a PMSM driving system. The adaptive fault-tolerant control system is characterized by comprising a quadrature-axis current pulsation component acquisition module, a fault mode decoupling and separating module, a fault degree acquisition module and a position deviation calculation and compensation module. By adoption of the adaptive fault-tolerant control system and method, fault mode positioning and separating and fault degree acquisition can be realized after the rotary transformer suffers from orthogonal imperfection and amplitude imbalance faults, and adaptive fault-tolerant control of the PMSM driving system after the faults also can be realized, thereby realizing safe and reliable operation of the PMSM driving system.

Description

Background technique [0001] The position detection of the permanent magnet synchronous motor (PMSM) drive system of electric vehicles mostly uses resolvers. Advantage. However, due to nonlinear influences such as resolver installation errors, resolver excitation and temperature drift of output conditioning circuit components, the sine and cosine outputs of the resolver have amplitude imbalance and quadrature imperfection faults, resulting in output based on the resolver decoder chip There is a position deviation between the demodulated position of the PMSM and the actual position of the motor, which makes the torque and speed of the motor continuously oscillate. [0002] Existing technical solutions are based on the existence of specific orders of abnormal harmonics in the sine-cosine output of the resolver based on quadrature imperfection and amplitude unbalance faults. Under offline conditions, the position is obtained by fitting the amplitude of the specific order of abnor...

AI Technical Summary

Problems solved by technology

However, due to nonlinear influences such as resolver installation errors, resolver excitation and temperature drift of output conditioning circuit components, the sine and cosine outputs of the resolver have amplitude imbalance and quadrature imperfection faults, resulting in output based on the resolver decoder chip There is a position deviation between the demodulated position of the PMSM and the actual position of the motor, which causes continuous oscillation of the motor torque and speed

[0002] Existing technical solutions are based on the existence of specific orders of abnormal harmonics in the sine-cosine output of the resolver based on quadrature imperfection and amplitude unbalance faults. Under offline conditions, the position is obtained by fitting the amplitude of the specific order of abnormal harmonics. Compensation polynomial for deviation and implement fault-tolerant control based on it, but this scheme cannot realize online diagnosis of resolver faults and the effect of fault-tolerant control is not good

The online parameter identification based on the recursive least squares method realizes the compensation method of the rotor position deviation caused by the fault of the resolver, which has the defect that the initial value of the parameters to be identified is relatively high, and this method is susceptible to noise interference, and cannot realize fault mode identification, fault Locating and determining the degree of failure

Based on the online fault diagnosis and fault-tolerant control method based on observing the motor rotor position by various observers and comparing it with the output demodulation position of the resolver decoder chip, there are deficiencies in the motor parameter change and the dead zone effect of the inverter directly affecting the rotor position observation accuracy. Failure mode recognition, fault location and determination of fault degree cannot be realized

In addition, the resolver-to-digital converter with integrated quadrature imperfection and amplitude unbalance fault on-line diagnosis and fault-tolerant control function designed by double synchronous decoupling phase-locked loop has the disadvantage of complex algorithm implementation

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