Abstract: The equivalent method of integrated power generation system of wind,photovoltaic（PV） and energy storage in power flow calculation and transient simulation was proposed based on actual projects,so as to establish the foundation of its connected-grid simulation and analysis.In power flow calculation,it included the equivalence of unit plants and collection system.Unit plants were equivalent to several nodes of different types by control modes,and collecting system was equivalent to a single system by principle of constant power-loss.The comparison of the equivalent model and detail model in a sample verified the correction and accuracy of the proposed method.In transient simulation,according to the analysis principle of the most serious condition,a multiply equivalent method of full-output unit plant was presented,which supplies a solution to dynamic equivalence for practical engineering.