PI controller parameter setting method and device

The invention provides a PI controller parameter setting method and device, relates to the technical field of automation control, and is applied to a PI control system, the PI control system comprises a PI controller and a controlled object, and the method comprises the following steps: obtaining a characteristic response curve corresponding to the controlled object; according to the characteristic response curve, obtaining a first-order inertial delay model by using a square difference integral minimum processing method; and determining a target parameter corresponding to the PI controller through the first-order inertial delay model according to a pre-acquired first formula, so that the dynamic performance of a closed-loop response curve reaches an optimal state. According to the method, the optimal parameter is found by using the distribution of the root locus on the real axis, the optimal dynamic performance of the closed-loop response curve is realized, and definite physical significance is given to para