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一、概述我省农村小流量的水源十分丰富,兴建了大批小型水电站。在这些小型水电站中,容量在75千瓦以下的多是双绕组电抗分流式的发电机。由于农村电网电压波动范围大(一般在360～440伏之间),当小水电站与其并网运行时,系统要求发电机力率在0.8(滞后)以下运行,而双绕组电抗分流式发电机很难适应这个要求。雨水季节电网电压过高时,力率往往超过0.9。但枯水季节,电网电压低,若出现个别区域内降雨,机组需要满
First, an overview The small flow of water in rural areas in our province is very rich in water, the construction of a large number of small hydropower stations. In these small hydropower stations, the capacity below 75 kilowatts is mostly double winding reactance shunt generator. Due to the large range of voltage fluctuation in rural power grids (generally between 360 and 440 volts), when the small hydropower station and its grid-connected operation, the system requires the generator power rate to run below 0.8 (lagging), while the double winding reactive shunt generator Difficult to meet this requirement. Rainy season grid voltage is too high, the rate of force often exceeds 0.9. However, the dry season, the grid voltage is low, if there is a rash in some areas, the unit needs to be full