With the large-scale development of distributed photovoltaic

it is necessary to strengthen the modeling research of distributed photovoltaic grid connection. Firstly

based on RTDS real-time simulation platform

photovoltaic grid connected models such as photovoltaic array

grid connected inverter

filter and isolation transformer are established. Secondly

when the power grid is three-phase symmetrical

the double loop control structure is used to build the photovoltaic control system model. Then

considering the asymmetric fault of power grid

a photovoltaic negative sequence control model based on double synchronous rotating coordinate system is established. Finally

the simulation results show that the proposed model also has good performance in case of power grid failure

and it is verified that photovoltaic negative sequence control can effectively reduce negative sequence current and current distortion.