Technical and economic research on the capacity of supply assurance for pumped-storage systems under the target of"dual carbon"
This study conducts a quantitative analysis on the technical and economic feasibility of pumped storage in typical provincial power grids using time-series simulations.Initially,we base our calculations on the future power planning data of a typical provincial power grid,examining the operational status of the power system for the entire years of 2025 and 2030.The results show that during certain periods of the year,the system experiences a tight power supply balance with a backup rate of less than 10％.This poses significant challenges to its adequacy and safety.Subsequently,we select two flexible regulation power sources,namely pumped storage and thermal power units,to compare and analyze the improvement of system power supply reliability and the economic quantification under the addition of these two new regulation power sources.Our findings suggest that,using the simulation results of the provincial power grid in 2030 as an example,configuring 12 million kilowatts of pumped storage and thermal power units can increase the annual standby rate of the provincial power grid system by more than 10％.This effectively addresses the issue of an insufficient system standby rate,thereby enhancing the system's supply guarantee capacity.Considering the environmental costs arising from changes in system carbon emissions,the annual comprehensive cost of improving the system's power supply level through pumped storage is lower than that of thermal power units at the same level.Additionally,it can positively influence the consumption level of new energy and reduce carbon emissions.Ultimately,we conduct a comparative analysis on the comprehensive economic benefits of pumped storage and lithium-ion battery storage in improving system power supply reliability.The results indicate that pumped storage has significant advantages in improving system power supply reliability and adequacy in terms of comprehensive economic benefits.
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