Fuzzy control method of dual-active full-bridge DC-DC converter

The invention discloses a method for controlling a dual-active full-bridge DC-DC converter based on fuzzy PI. According to the specific process of the method, a relationship between transmission powerand a phase shift angle is obtained through an instantaneous power integral formula; a PI controller is constructed to control the phase shift angle; constant power transfer may be achieved, at the moment, the converter is equivalently connected to a constant load; a fuzzy controller is added on the basis of the PI controller; the output voltage of the converter is acquired, reference output voltage is subtracted from the output voltage, so that e=u-eref can be obtained; derivation is performed on the e=u-eref, so that ec can be obtained, and e and ec are inputted into the fuzzy controller; the correction values delta Kp and delta Ki of PI parameters are obtained through a fuzzy algorithm; the correction values delta Kp and delta Ki are added to coefficients Kp and Ki of the PI controllerrespectively, so that new