660 MW汽轮机甩负荷试验转速二次飞升原因分析

Cause Analysis for Secondary Speed Rise of 660MW Steam Turbine in Load Rejection Test

针对某上汽西门子汽轮机甩负荷过程中汽轮机转速二次飞升较高的问题,对该机组甩负荷逻辑进行了详细研究,指出该现象出现的主要原因是:高、中压调节汽阀快关电磁阀失电时间和高、中压调节汽阀开度置零指令(R410)的复位时间,与转速/负荷控制回路中PID函数的调节速率不匹配。通过延长高、中压调节汽阀快关电磁阀失电时间及R410的动作时间,有效抑制了甩负荷后汽轮机转速的二次飞升。

Aiming at the problem of high secondary rising speed during load rejection of a steam turbines produced by Shanghai Steam Turbine Plant with German Siemens technology,the load rejection logic of the unit is studied in detail.It is pointed out that the main reason for this problem is that the power-loss time of quick-closing solenoid valves and the reset time of zero-setting instruction for the opening degree of HP and IP control valves(R410)didn’t match the regulating rate of PID function in speed/load control loop.The secondary speed rise of the steam turbine after load rejection was effectively restrained later,by prolonging the power-loss time of quick-closing solenoid valves of HP and IP control valves and the operating time of R410.