The volatility impact and insufficient level of new energy accommodation brought by the high proportion of new energy connected to the grid have become an urgent problem to be solved under the background of new type power system. Therefore, based on the characteristics that the increase of prediction accuracy of wind,photovoltaic power and load improves step by step with reduced time scales and the flexible regulation ability of pumped storage plant,a multi-time scale coordinated dispatching model of wind-photovoltaic-pumped storage zero-carbon power system is established. In order to minimize the cost of power generation,the power generation plans of day-ahead 24-hour,the intraday 1-hour and the real-time 15-minute are established. Through the coordination of multiple time scales,the wind power,photovoltaic power and pumped storage output track the load well,thus revising the power generation plan step by step. Taking the wind-photovoltaic-pumped storage zero-carbon power system with 6 pumped storage units as an example,the simulation analysis shows that the proposed multi-time scale coordinated dispatching model is conductive to reducing curtailment of wind and photovoltaic power,and the ability of power system to accommodate wind and photovoltaic power is related to the installed capacity of pumped storage plant.