PWM output voltage deviation compensation method and device under low carrier wave ratio and medium

The invention provides a PWM output voltage deviation compensation method and device under a low carrier wave ratio and a medium, and belongs to the technical field of electronics. The method comprises the following steps: converting an expected output voltage into a target voltage vector under a synchronous rotating coordinate system; according to the angular frequency of the expected target output voltage and the PWM control period, amplitude and phase adjustment is carried out on the target voltage vector, and an intermediate voltage vector is obtained; carrying out inverse transformation on the intermediate voltage vector to obtain compensated output voltage; and controlling the PWM output of the power electronic device according to the compensated output voltage. By means of the PWM output voltage deviation compensation scheme under the low carrier wave ratio, fundamental wave voltage deviation introduced by digital-to-analog conversion discretization in the PWM modulation technology is eliminated, and t