Method for acquiring nonlinear load equivalent impedance parameters of distribution network in real time

The invention discloses a method for acquiring nonlinear load equivalent impedance parameters of a distribution network in real time. The method comprises the following steps of: (1) acquiring electric signals u(t) and i(t) of the distribution network; (2) acquiring a first voltage parameter coefficient Au(t), a second voltage parameter coefficient Bu(t), a first current parameter coefficient Ai(t) and a second current parameter coefficient Bi(t); (3) respectively performing time-t derivation on the first current parameter coefficient Ai(t) and the second current parameter coefficient Bi(t), and respectively calculating A'i(t) and B'i(t); and (4) accurately calculating the nonlinear load equivalent impedance parameters R(t) and L(t) of distribution network at each moment. The nonlinear load equivalent impedance parameters of the distribution network at the moment can be acquired in real time according to the acquired current and voltage values at any moment, the parameters are not related to the frequency of