The controller of grid-connected inverter plays a decisive role in the transient characteristics of the photovoltaic (PV) system. Therefore

the accuracy of the controller parameters is quite important in the analysis of PV system impact on the power system. This paper presents a dq axis decoupling parameter identification strategy for a typical PV inverter

which contains double loop control model. Furthermore

the parameter identification effects are compared

in terms of the impact of different levels of noise and different types of disturbances. In addition

the impact of the filter inductance error on the identification is discussed. Finally

the validity of the identification strategy is proved by case studies.