Abstract: Given the inherent features of volatility,intermittency and randomness of solar photovoltaic power generation,requirements for interconnection performances of photovoltaic power generation system have been demanded by grid operators around the world.However,there are some restriction associated with the photovoltaic power stations,such as electrical conditions,geographical location and test equipment capacity.The grid performance of a power station often cannot be directly measured,and it is difficult to verify whether the performance can meet the standard requirements.German Association of Energy and Water Industries（BDEW）standardGenerating the plants connected to the medium-voltage network",not only requires that photovoltaic inverter must take laboratory test,but also presents that the inverter must provide simulation model which is consistent with the measured results,in order to analyze and evaluate the interconnection performance.According to the BDEW standard,we use the DIgSILENT simulation platform to carry out the modeling simulation of grid-connected inverters.In order to solve the problem that the accuracy of the photovoltaic inverter model cannot be effectively measured,we analyze the calculation error between measured and simulation data,and develop the model validation tool.This tool can be used to effectively evaluate whether the grid-connected inverter model has met the standard validation requirements.It provides the foundation for the analysis of the photovoltaic power station connected to the grid.