沙坪二级水电站河道型水库超短期水量平衡计算

Calculation of Ultra-short-term Water Balance for Channel Reservoir of Shaping Secondary Hydropower Station

河道型水库超短期水库水量平衡模拟是支持水库运行的关键,但计算结果产生锯齿状震荡,通过延长模拟时间尺度,确认计算误差是由坝前水位波动所致。在引起坝前水位波动的各因素中,以负荷变化量为例,修正了由于负荷变化量所导致的水量平衡计算误差。提出了基于一维水动力的河道型水库超短期水量平衡算法,该算法建立河道—库区一维水动力模型,推求库区平均水位代替坝前水位精确计算出库容,从而消除了由于坝前水位波动引起的锯齿状误差。计算结果表明,修正负荷变化量的影响后,可有效提高模拟精度,基于一维水动力的河道型水库超短期水量平衡算法已消除了锯齿状误差,模拟精度较高。

The ultra-short-term reservoir water balance simulation of channel-type reservoirs is the key to the operation of the reservoir,but the results easily appear sawtooth oscillation.The calculation error is due to the fluctuation of the water level in front of the dam by extending the simulation time scale.Among the factors that cause the fluctuation of the water level in front of the dam,taking the load change as an example,the calculation error of water balance caused by the load change was corrected.An ultra-short-term water balance method for channel-type reservoirs was put forward based on one-dimensional hydrodynamics.The method established a one-dimensional hydrodynamic model of the river-reservoir area,and procured the accurate storage capacity by calculating the average water level instead of the water level in front of the dam,thereby eliminating the jagged error.The calculation results show that the simulation accuracy can be effectively improved after eliminating the influence of load changes.The ultra-short-term water balance method for channel-type reservoirs based on one-dimensional hydrodynamics can eliminate the sawtooth error and achieve high simulation accuracy.