In recent years

non-linear passive control technology has been introduced widely into the current tracking control of cscaded D-STATCOM（distribution static synchronous compensator）

which improves effectively both transient response speed and stability of D-STATCOM system. However

the reac-tive control performance is affected due to perturbation of such parameters as inductance and resistanceduring the long term operation. For solving the effect due to the parameters perturbation

in this paper

akind of adaptive passive control method is proposed to design adaptive control law through observing varia-tion of the out and input current and offset the influence of parameter perturbation by way of one-line computing and correcting parameters of the controller（virtual injection impedance）. The adaptive method pro-posed is verified by way of setting up dynamic model experiment platform. It is shown by the experimental result that the proposed method can improve quality of output current waveform and improve applicabilityof the controller under parameter perturbation