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电力系统在小水电开发地区,依据小水电站群布局及农电负荷分布,在适当地点设置变电所,再以6～35千伏线路与各小水电站并网。这种并网变电所具有多电源及双向(升压或降压)运行的特点。其主要电源是电力系统、小水电在丰水季节通过并网变电所向系统送电,枯水季节又需要系统回供。并网变电所并不承担直接并网的任务。当并网变电所因事故与系统解列后恢复运行的操
Power System In small hydropower development areas, substations are set up in appropriate locations according to the distribution of small hydropower station clusters and rural power load, and the grids are interconnected with small hydropower stations by 6 to 35 kilovolts lines. This grid-connected substation with multi-power and bidirectional (step-up or step-down) operation characteristics. The main power source is the power system. Small hydropower power is sent to the system through the grid-connected substation during the wet season, and the system needs to be supplied back to the system during the dry season. Grid substation does not undertake the task of direct grid connection. When the grid substation accident and system out of operation after the resumption of operation