考虑支流流量影响的梯级水电站短期优化运行策略

Strategy of short-term optimal operation for cascade hydropower station of thinking effect of tributary inflow

对于中小河流上的梯级水电站,入库支流流量占入库径流的比例可能较大,在短期运行决策时需重点考虑入库支流流量的高效利用。以硕多岗河梯级水电站为例,提出了考虑入库支流流量影响的梯级水电站短期优化运行策略。指出应以支流汇入位置为界将梯级水电站划分为多个子梯级,并依据支流来流和区间入流规模、电站装机容量和发电特性确定支流汇入下游子梯级的出力规模;在此基础上,结合电力负荷需求确定子梯级群间负荷分配方案和龙头水库的补水规模,进而达到降低梯级弃水,提高梯级水能利用效率和蓄能的目标。实际算例验证:所提策略合理可行。

For cascade hydropower stations in the medium or small river, tributary flow may account for a large proportion of total runoff.It is necessary to consider the high efficiency utilization of tributary flow when deciding short-term operation of cascade hydropower station.Taking the cascade hydropower sta-tions on Shouduogang river for example,the paper proposed a short-term optimal operation strategy consid-ering the influence of tributary inflow.It is necessary to take the position of tributary flow as boundary so as to make cascade hydropower stations become a multiple sub-cascade.Meanwhile,output level of the downstream sub-cascade should also be determined based on tributary inflow and local inflow,installed capacity and characteristics of generation electricity of the hydropower stations.Then, the load demand distribution solutions and water replenishment amount of uppermost reservoir can be obtained.The utiliza-tion efficiency and aim of storage of hydropower of cascade waterpower can be improved with less aban-doned water.The strategy proposed by the paper is reasonable.