In the distribution network

the power quality of distribution network can be improved perfectly by using the distribution static synchronous compensator（D-STATCOM） with fast response characteristics.But due to the characteristics of distribution network itself

the shortcomings of traditional PI control in parameters and self adaptation can not meet the requirement that the output at AC side of D-STATCOM can quickly track the control of command current signal without offset.In this paper

the fuzzy immune PI control is designed based on the combination of immune feedback mechanism

fuzzy control and traditional PI control and is used in D-STATCOM.The simulation results show that

compared to the traditional PI control

this control possesses multiple advantages

and it can make D-STATCOM adapt to the distribution network.