高海拔极寒地区光伏升压站设计研究OA

To address the engineering challenges of a 220 kV photovoltaic(PV)collection substation in Tibet,including high altitude,extreme low temperature,and limited land resources,this paper conducts research on the design of a high-altitude compact substation.First,based on relevant standards,the external insulation and air clearance of equipment under high-altitude conditions are corrected,and the corrected air clearance values for 35 kV and 220 kV switchgear are obtained.Second,equipment selection schemes are proposed considering low temperature,intense ultraviolet radiation,and sandstorms,including the adoption of KI50X low-temperature transformer oil,heat tracing for GIS tanks,tank-type circuit breakers,UV-resistant fluorocarbon paint and composite bushings,and sandstorm-proof double-sealed enclosures.Third,assembled shunt capacitors are selected instead of frame-type capacitors,reducing the footprint by approximately two-thirds.Finally,a double-layer elevated platform arrangement combining 220 kV GIS and 35 kV switchgear is proposed.The results show that the compact double-layer arrangement saves about 50%of land compared with conventional single-layer schemes while ensuring safe equipment operation under harsh environmental conditions.The findings of this paper can serve as a design reference for PV collection substations in high-altitude and extremely cold regions.