调压室参数对水力干扰下机组调节品质的影响分析

水力干扰发生在一管多机布置形式的电站中,是介于大波动和小波动之间的一种特殊过渡过程。为了研究调压室参数对水力干扰工况下机组调节品质的影响,选择两种典型水力干扰工况,并针对不同调压室参数组合和两种不同调节模式进行数值计算分析,结果表明:阻抗孔面积对水力干扰工况下正常运行机组调节品质影响较大,当选择合适的阻抗孔直径时可以使得正常运行机组最大出力摆动较小的同时又能在较短时间内恢复稳定状态;调压室大井面积较大时可以使得受扰机组在较短时间内恢复稳定运行状态;阻抗孔流量系数对水力干扰工况下正常运行机组调节品质影响较小。

An Analysis of the Influence of the Parameters of the Surge Tank on the Regulating Quality of the Unit under the Hydraulic Interference

Hydraulic interference occurs in a power plant with one pipe and multiple machines,which is a special transition process between large fluctuation and small fluctuation.In order to study the influence of the parameters of surge tank on the regulating quality of the unit under the condition of hydraulic interference,two typical hydraulic interference conditions are selected,and numerical calculation and analysis are carried out for different combinations of parameters of surge tank and two different regulating modes.The results show that the area of impedance hole has a great influence on the regulating quality of the unit under the condition of hydraulic interference.When d=2.7 m is selected,the unit can be operated normally.When the maximum output swing of the unit is small,it can also regain the stable state in a short time.When the large well area of the surge chamber is large,the disturbed unit can regain the stable operation state in a short time.The flow coefficient of the impedance hole has little influence on the regulating quality of the normal unit under the hydraulic interference condition.