Pumped storage (PS) is a crucial resource for ensuring the secure operation of new type power systems and promoting the efficient utilization of large-scale green electricity. Due to resource constraints

some regions are developing PS in clusters. Different from the planning and operation of a single pumped storage plant

the cluster development of PS faces challenges including the complex cluster characteristics with strong hydrological-electrical coupling

diverse functional requirements for supporting power systems

and multivariate collaborative planning objectives with renewable energy bases and regional power grids. To this end

this paper begins by elucidating the functional positioning of PS clusters in serving the new type power system

based on their operational characteristics that account for hydrological coupling and electrical interdependencies. Subsequently

based on traditional PS planning methods

the challenges of cluster planning are summarized. Furthermore

it reviews the research progress on PS's role in supporting power system operations

including peak shaving

frequency regulation

and voltage control

and examines the market mechanisms and cost allocation methods for PS operations. Building on existing research

this paper identifies key scientific issues in PS cluster planning and provides a forward-looking perspective on PS cluster planning research from four aspects: cluster modeling

coordinated operation

planning decision-making

and market operation. This study provides references and recommendations for the development of large-scale supportive resources in new-type power systems.