基于全寿命周期成本理论的变电站经济性评价模型

Model of substation economic evaluation based on LCC theory

针对变电站在设计和改造过程中如何经济合理地选择配电装置的问题,建立了基于全寿命周期成本(LCC)理论的变电站经济性评价模型。考虑到变电站不同配电装置寿命周期不同,将LCC等年值作为变电站选型的经济性评价指标,并对影响经济性的重要因素进行了灵敏度分析;以500 kV变电站为例,计算了气体绝缘金属封闭开关设备(GIS)变电站和空气绝缘开关设备(AIS)变电站全寿命周期成本的等年值;基于计算结果,对GIS变电站和AIS变电站的经济性进行了评价,并对影响变电站经济性的两个重要因素(土地成本和设备购置费用)进行了灵敏度分析。研究结果表明:在当前的价格水平下,对于偏远地区变电站,选择AIS配电装置更为经济合理;随着土地成本的升高或GIS设备成本的下降,GIS变电站的经济性将优于AIS变电站,城市变电站选择GIS配电装置更为经济。

Aiming at the problems of making scientific and rational decisions in the selection of high voltage electrical switchgear in the substation＇s design and renovation process,a model of substation economic evaluation based on the assets life cycle cost（LCC）theory was proposed. Annual value was used in the economic evaluation process regarding the difference in life cycles and sensitivity analysis was made on the most significant factors. Taking the 500 kV substations for instance, the LCC annual value of gas insulated switchgear（GIS） substation and air insulated switchgear（AIS）substation were calculated. Based on the calculation results, economic evaluation on GIS substation and AIS substation was made accordingly. Then, sensitivity analysis was made on the most significant factors,land price and the equipment price. The results indicate that AIS substation is more economical in remote areas under the current situation. Meanwhile, as the price of GIS equipments decreases or the price of land increases,GIS is highly cost efficient and more economical in urban substations.