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截至1987年底,在西北四省(区)电网中运行的大、中型水电站共有七座,总计装机容量为310.4万千瓦.近十年来随着西北电网中水火电电源建设的交替上升,水电装机约占全网装机的40～50%,而年发电量约占通1/3.在全国六大电网中,水电装机占如此高的比例,是其他电网无法比拟的,可谓得天独厚.众所周知,水电机组在电网中运行,具有启停机灵活方便、迅速(一般2—4分钟可以完成开机并网、解列停机的全过程),并具有无环境污染等一系列优点.更应强调指出的是,水电机组其升速、带负荷的速度不受外界条件的影响,因此,它能满足电力系统瞬息万变的调频、调峰,以及作系统事故备用的需要,单就此言,其社会效益就无与伦比.
As of the end of 1987, a total of seven large and medium-sized hydropower stations operating in the power grids of the four provinces (autonomous regions) in the northwest had a total installed capacity of 3.104 million kilowatts. In the past ten years, as the construction of hydropower power plants in the northwest power grid increased alternately, Accounting for 40 to 50% of the installed capacity of the whole network, while the annual generating capacity accounts for about 1/3. Among the six major power grids in the country, the installed capacity of hydropower accounts for such a high proportion, which is incomparable with other power grids.As we all know, hydropower units In the grid operation, with a start and stop flexible, fast (usually 2-4 minutes to complete the boot and grid, stop column down the entire process), and has no environmental pollution and a series of other advantages should be emphasized that it is more, hydropower Therefore, it can meet the rapidly changing frequency regulation and peak regulation of power system and the need for backup of system accident. The efficiency of unit alone is unsurpassed.