Abstract: In addition to fixed-speed pumped-storage (PS) units, other types of PS units (double-fed asynchronous variable speed, full-size converter, ternary, and separated type units) have their own flexibility advantages. First, based on the production cost model of the energy system, different PS power generation models are established by considering the technical characteristics of operation area, unit efficiency, start-up time, ramping speed and so on. Then, the effects of operating area, unit efficiency, start-up time and ramping speed on output curve of PS unit are compared. Finally, the influence of PS types on the regional energy system under different wind-solar ratios is comprehensively evaluated by power generation, pumping, wind-solar curtailment, load loss, carbon emission and coal-power ramping indicators. The results show that the ternary and separate units are more flexible in generating mode, while the full-converter variable speed unit is more flexible in the pumping mode, which leads to the fact that the annual power generation and annual pumping of the fixed-speed unit are higher than those of the other four types. In addition, with the increase of wind power permeability, the total output of coal power and system carbon emissions decreases, but the power regulation depth of coal power and PS units increases. Therefore, it is necessary to fully consider the applicability of PS characteristics in the feasibility demonstration stage.