A field-weakening control method for a surface-mounted permanent magnet synchronous generator

Abstract

The invention discloses a surface-mounted permanent magnet synchronous generator flux weakening control method, belonging to the PMSM control technical field. The method employs a current regulator to provide a direct-axis voltage when a motor rotating speed is higher than a base speed, thereby allowing a motor to move along the intersection between a voltage horicycle and a constant torque curve. The method allows a current locus to meet a torque curve, and meanwhile to meet voltage and current restriction; an output direct current voltage can rapidly recover stability after short fluctuation, and possesses sound dynamic response.

Description

technical field [0001] The invention discloses a field-weakening control method for a surface-mounted permanent magnet synchronous generator, which belongs to the technical field of permanent magnet synchronous motor control. Background technique [0002] The surface-mounted permanent magnet synchronous generator rotor is excited by permanent magnet materials. Due to its small size, high power density, strong dynamic adaptability, and easy control, it has been widely used in various fields of production and life. However, the traditional i d = 0 vector control, with the increase of the speed, the output voltage will not be stable, which limits the speed range of the generator and is not suitable for practical engineering applications. In the field of permanent magnet synchronous generator voltage stabilization control, the mutual coupling of dual current regulators in the traditional field weakening control method will cause the problem of poor dynamic response. The current...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is aimed at the deficiency of the above-mentioned background technology. In order to obtain a stable output voltage at a wide speed and to prevent the output voltage of the surface-mounted permanent magnet synchronous generator from being unstable due to the increase in the speed, a The surface-mounted permanent magnet synchronous generator field weakening control method obtains the required quadrature-axis current given value at real-time speed through the output DC voltage outer loop PI regulator, and then determines the direct-axis voltage given value by the given value of the quadrature-axis voltage. Fixed value, while ensuring that the current operates on the voltage limit circle, the current operating point is guaranteed to work on the required torque curve, which solves the technical problem of low control efficiency of the traditional single current regulator control method

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