大型光伏电站集电线路电压等级选择

Voltage Level Selection of Collecting Power Lines for Large-scale Photovoltaic Power Station

小型光伏电站一般通过380 V电压等级并网,中型光伏电站一般通过10～35 kV电压等级并网。由于光伏组件布置区域较小且并网电压低,小型光伏电站不存在集电线路,中型光伏电站集电线路电压等级即为接入系统电压等级,选择较为简单。大型光伏电站接入系统电压等级一般为66 kV以上,组件布置面积大,集电线路的造价也较大,因此需要对35 kV与10 kV电压等级集电线路进行选择。通过对某200 MW光伏电站建模,从投资和损耗2个方面比较2种电压等级集电线路的造价,进而得出相关结论,供同行及有关研究部门参考。

Small photovoltaic （PV） power station generally connects the grid at 380 V, medium PV power station connects the grid at 10 ~ 35 kV. Because the arrangement range of PV modules is small and the grid voltage is low, there is no collecting power line in the small PV power station, and in the medium PV power station, the voltage of collecting power line is equal to the grid voltage and the selection is relatively simple. However, for large-scale substation PV power station, the grid voltage is more than 66 kV, the arrangement range of PV modules is large, the manufacturing cost of collecting p oxver line is also high, and it is difficult to make a choice between 10 kV and 35 kV. This paper built the model for a 200 MW PV^power .station, as well as compared the manufacturing cost of collecting power line at two kinds of voltage from the aspects of investment and loss. The research results could be a reference for the design of PV power plant and relevant research departments.