水利水电技术（中英文）

我国有大量水电站所在河流泥沙含量高,在夏季丰水期需降低水库水位作排沙运行,导致电站在丰、枯水期运行时水头变幅很大。"超常规水头变幅电站"即是指最高水头与额定水头之比超过1.4的水电站。为满足灌溉需要,部分超常规水头变幅电站水库各旬放水量极不均匀,又会导致过机流量变化也很悬殊,常规的水轮机选型原则无法满足类似电站的选型需求。通过分析新疆某超常规水头变幅电站的运行参数,划定了高、低水头段,使水轮机组分别配置相应的水轮机转轮,以实现在不同水力参数下运行时,水轮机均处于较高效率运行范围,同时提升了水轮机的运行稳定性。

There are a large number of hydropower stations in China that have high sediment content in the rivers, and they need to operate at low water levels during the summer high water period, which leads to large head changes during the high and low water periods. The "transnormal head variable amplitude hydropower station" in here refers to a hydropower station with a ratio of the highest water head to the rated water head exceeding 1.4. For some transnormal hydraulic head variable amplitude power stations, in order to meet the needs of irrigation, the water discharge of the power station reservoirs is extremely uneven every ten days, and it will also cause the flow rate to vary greatly. If the conventional hydraulic turbine selection principle is adopted, the selection requirements of similar power stations cannot be met. This paper analyzes the operating parameters of a hydropower station in Xinjiang, delineates the high and low head sections, and configures the corresponding turbine runners respectively to realize that the turbines are in a higher efficiency operating range when operating under different parameters, and at the same time, it can also improve operational stability of the turbine.