抽水蓄能电站导叶关闭规律的优化

为了改善抽水蓄能电站的传统两段导叶关闭规律优化效率较低的缺陷,对一种先延时再直线关闭的特殊关闭规律进行了研究。采用延时直线关闭规律和两段关闭规律对不同转轮特性、不同额定水头的抽水蓄能电站进行了过渡过程仿真计算并对结果加以比较。延时直线关闭规律能显著地降低最大水击升值和机组转速升值,并且仅有两个控制变量,因而易于优化。在其延时段,可利用可逆机组甩负荷后转速上升和机组流量相互抑制的特点而提高关闭规律的优化效率。

Optimization of distributor closing law in pumped storage stations

A single-slope closing law with a leading constant time delay was developed to improve the low efficiency of the traditional two-segment closing law used to stop the flow and the turbine in pumped storage stations after load rejection.The transient closing process in pumped storage stations for various rated heads was simulated with the time-delay closing law and two-segment closing laws.The time-delay closing law significantly reduces the maximum water hammer and turbine rotation speed and can be conveniently optimized since it has only two control variables.The time-delay segment provides simultaneous reduction of the rotational speed and the discharge of the reversible turbine after load rejection,which improves the efficiency of the optimized closing law.