Flux Weakening Control Strategy for High Speed Permanent Magnet Synchronous Motor Based on Voltage Fhase Angle Regulation
Aiming at the problem of poor current loop immunity in the high-speed operation of permanent magnet synchronous motor(PMSM),a harmonic suppression strategy for flux weakening with voltage phase angle regulation is proposed in the paper.Firstly,the small-signal model of the control system is established through linearisation,and then the closed-loop transfer function of the system is obtained to analyse the stability of flux weakening.In order to overcome the problems of low damping coefficient and poor system stability during acceleration,a proportional differential compensation strategy is introduced into the straight-axis current regulator to realise the inner-loop feedback in order to improve the system damping ratio and suppress the system resonance peaks so as to reduce the current oscillations during high-speed operation.Finally,the key parameters of the compensator are determined based on the principle of equivalent internal mode controller and frequency domain analysis.The experimental results show that the method can effectively improve the stability of the current loop and the anti-interference performance of the control system,and significantly reduce the harmonic content of the motor current.
voltage fhase angle controlflux weakening controlpd compensation
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