摩擦对水力机组大波动过渡过程影响研究

运用MATLAB/Simulink软件对考虑摩擦和不考虑摩擦时一台水力机组在额定工况下甩负荷运行后的大波动过渡过程的仿真结果进行了比较,讨论了摩擦对电站甩负荷后的蜗壳末端水击压力、尾水管末端转速及水轮机真空度等因素的影响,进而为水电站在大波动调保计算时是否考虑摩擦的影响提供一定程度的参考.理论分析表明,摩擦对大波动过渡过程存在一定影响,但是在一定条件下,这种影响可忽略.仿真结果表明,不考虑摩擦时的水击压力和转速都略大于考虑摩擦时的水击压力和转速.对实际工程而言,这种偏大的计算结果是安全的.

Influence of friction on the large oscillation transient process of hydraulic unit

Using the MATLAB/Simulink software, the simulation results of large oscillation transient process of one hydraulic unit under the rated condition were compared when the friction was considered or not. The influence of friction on the speed and pressure of hydraulic turbine after load shedding was discussed. The results can provide reference for calculation of regulating guarantee under large oscillation transient process. The theoretical analysis indicates that the friction has some influence on the large oscillation transient process, but this influence can be ignored. The simulation results show that the pressure and speed with no friction are higher than those with the friction, which is safe in terms of projects.