二滩水电站550MW水轮机水力特性

Hydraulic characteristics of 550 MW turbine of Ertan Hydro Station

:二滩水电站水轮机模型的最高效率为 94 46 % ,根据模型预期的水轮机真机最高效率为 96 14% ,模型主要指标均达到合同要求。真机的部分稳定性试验表明 ,机组存在较宽的水力振动区 ;在非水力振动区 ,尤其是 5 0 0MW以上的高负荷区 ,机组运行稳定性良好。 6号机组在 16 3m水头下振动区为 2 2 0～ 32 0MW ,在 173m水头下为2 0 0～ 36 0MW ,5号机组在 173m水头下振动区为 15 0～ 40 0MW ,4号机组在 16 9 5m水头下振动区为 2 2 0～ 40 0MW ,3号机组在 179 7m水头下振动区为 2 0 0～ 42 0MW。如何采取有效的措施以改善或避开目前存在的水力振动区从而提高二滩水电站水轮发电机组的运行质量和安全、稳定性 ,仍是一个值得深入研究的课题。

The maximum efficiency of model turbine for Ertan Hydro Station is 94.46% and that of its real turbine is expected to be 96.14%. The main indexes of the model turbine all meet the requirements of the Contract. The stability test on real turbine showed that the generating unit has a wide hydraulic vibration area. Outside the hydraulic vibration area, especially in high load area of over 500 MW, the operation stability of the generating unit is good. The vibration area of No.6 generating unit is 220~ 360 MW under the water head of 163 m and 200~360 MW under that of 173 m. The vibration area of No.5 generating unit is 150~400 MW under the water head of 173m, that of No.4 generating unit is 220~400 MW under the water head of 169.5 m, and that of No.3 generating unit is 200~420 MW under the water head of 179.7 m. How to take effective measures to improve or avoid the hydraulic vibration area at present in order to enhance the operating quality, safety and stability of the hydrogenerating units of Ertan Hydro Station is still an important study subject.