New energy generation represented by wind power and photovoltaic is characterized by seasonal and short-term stochastic fluctuation. With the large-scale grid connection of new energy sources

their output characteristics bring new challenges to the power balance of new power systems. For assuring reliable operation of the power system

the multi-timescale-oriented power power balance method is performed in this paper. Firstly

based on the historical data of Fujian power grid from 2019~2022 in combination with the climate and weather characteristics in Fujian

the multi-timescale output characteristics of new energy power generation are analyzed and the challenges faced by power supply preservation are summarized. Then

a power system operation simulation model considering medium- and long-term power balance and short-term ionization balance is constructed

and a typical scenario identification method considering seasonal characteristics and extreme weather is proposed. Finally

by taking Fujian power grid as an example and calculating the electricity power balance model under different time scales and analyzing the time-sequential production process with the participation of multiple forms of power generation

the insufficient power supply of Fujian power grid in case of large-scale new energy grid integration and the possibility of different capacity settings for conventional generating units in the context of large-scale new energy grid integration are quantitatively analyzed and

moreover

the relevant suggestions for balancing the adequacy of electricity power is proposed.