Complex-vector-regulator-based low-carrier-ratio control method for permanent-magnet synchronous motor

Abstract

The invention relates to a complex-vector-regulator-based low-carrier-ratio control method for a permanent-magnet synchronous motor. The method comprises: constructing a complex vector current regulator and an electric drive control system of a permanent-magnet synchronous motor; according to a speed loop PI regulator, carrying out calculation to obtain d-axis and q-axis reference command currentsin a synchronous coordinate system; difference processing is carried out on the reference command currents in the dq synchronous coordinate system and a current obtained by sampling by a current detecting module to obtain an error current, the error current is inputted into the complex vector current regulator, and the regulator outputs a voltage signal; an average voltage value outputted by thecurrent regulator within a sampling cycle is estimated and an active damping state feedback amount is added at an average voltage output terminal to form a system modulation signal; and the system modulation signal is subjected to SVPWM modulation to generate a PWM pulse wave and thus a three-phase full-bridge inverter is controlled to output an actual voltage, and the SVPWM inverter is connectedto the permanent-magnet synchronous motor to drive the motor.

Description

technical field [0001] The invention relates to the field of permanent magnet synchronous motor control, in particular to a low carrier ratio control method of a permanent magnet synchronous motor based on a complex vector regulator. Background technique [0002] Permanent magnet synchronous motors are widely used in the AC servo field because of their high efficiency, small size, high power density, and small torque ripple. Vector control has been widely used in the field of high-performance permanent magnet synchronous servo control. The synchronous proportional-integral regulator based on the synchronous coordinate system can realize the adjustment and tracking of the current command in a large speed range, and the steady-state tracking performance is good. , thus becoming the industry standard for AC motor current control. [0003] In the synchronous coordinate system of the motor, there is cross-coupling in the d and q axes, and as the speed increases, the proportion o...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a low-carrier ratio control method for permanent magnet synchronous motors based on a complex vector regulator, which solves the problems of aggravated current coupling and increased current sampling errors when the motor is running at a low carrier ratio, and at the same time, improves the control system's response to the motor The ability to change parameters improves the overall control performance of the system

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