Current loop controller decoupling method and device for voltage outer loop method

Abstract

The invention discloses a current loop controller decoupling method and device for a voltage outer loop method. The method comprises the following steps: determining a direct-axis current reference value of a current loop controller based on a motor parameter of an alternating current motor, a first parameter of a voltage outer loop controller and a second parameter of the current loop controller; the state of the alternating current motor is determined based on a first direct-axis current value and the direct-axis current reference value, the first direct-axis current is specifically the direct-axis current value under the maximum torque current ratio control strategy, and the state comprises a weak magnetic area and a non-weak magnetic area; determining an integral term of a current loop controller based on the state and a direct-axis current reference value; and carrying out desaturation and decoupling processing on the current loop controller based on the flux-weakening flag bit and the integral term, so that desaturation and decoupling can be rapidly carried out on the quadrature-direct axis controller when the quadrature-direct axis controller is in a saturated state, thereby improving the flux-weakening control performance of a voltage outer loop method.