The constructions of pumped-storage hydropower plants (PSHPs) and the hydro-wind-solar-storage (HWSS) complementary system within a cascade HWSS integrated energy base along the river basin are important means of improving the consumption of wind and solar power and accelerate the integrated development of renewable energy. The HWSS complementary system can be configured with hybrid or traditional pure PSHPs according to the local geographic conditions. To select the optimal configuration, this paper starts with the demands of the dispatching operation. First, the seasonal and intraday complementarities of hydro, wind, and solar (HWS) resources are quantitatively analyzed. Then, based on a refined cascade hydropower plant model along the basin and considering the respective configurations with hybrid and pure PSHPs, a short-term dispatching optimization model for an HWSS complementary systems is constructed with the minimum load tracking deviation rate, minimum energy curtailments, and maximum hydropower utilization rate as objectives. The impacts of different forms of PSHPs on the HWSS complementary system can thus be explored from the perspective of the dispatching operation. Finally, a case study on a cascade HWS integrated base along the basin shows that the configuration with mixed PSHPs exhibits smaller load tracking deviation rates, lower energy waste, and higher hydropower utilization rates, in different operating scenarios, than the configuration with pure PSHPs. The overall operating efficiency is also improved, which indicates a better improvement of the HWSS complementary system’s dispatching operation by the configuration with mixed PSHPs than that with pure PSHPs. This research can provide decision support for the planning and dispatching of clean energy bases and PSHPs along river basins.