摘要
针对华能上海石洞口第二电厂1、2号超临界2×600MW机组自动发电控制(AGC)方式下的主蒸汽温度、主蒸汽压力及汽水分离器中间点温度的控制偏差较大、燃料量波动幅度大等使得AGC投入率较低的问题,结合机组的运行工况,对机组协调和主、再热蒸汽温度、给水流量等子系统的控制策略进行优化,并对优化后的控制系统进行了1.5%/min变负荷试验。在负荷变化过程中,2台机组的主蒸汽温度偏差绝对值均<5℃,再热蒸汽温度偏差绝对值均<10℃,汽水分离器中间点温度偏差绝对值均<6℃,主蒸汽压力偏差绝对值均<0.6MPa,功率偏差绝对值均<2MW,表明优化后的控制系统减小了各参数的控制偏差,负荷响应快,且满足AGC要求。
In the No. 1 and No. 2 supercritical 600 MW units in Huaneng Shanghai Shidongkou Second Power Plant,under the unit automatic generation control （AGC）,large control deviation of the main steam temperature,main steam pressure and superheating ratio at steam separator in- termediate point resulted in low input ratio of the AGC. Combining with the operation situation of the unit, optimization on control logic of several subsystems was performed, such as the unit coor- dinated control system, the main and reheat steam temperature control system, and the feed flow rate control system. The variable load test with load variation rate of 1.5 %/min was conducted on the optimized control system. The results show that, the absolute values of the main steam tem- perature deviation of the two units during load variation are both below 5 ℃, that of the reheat steam temperature are below 10 ℃ ,and that of the superheating ratio at steam separator interme- diate point are below 6 superheating ratio at steam separator intermediate point. Moreover, the ab- solute value of the main steam pressure deviation of the two units are both less than 0.6 MPa,and that of the power are less than 2 MW,indicating the optimized control system makes the fluctua- tion of the steam turbine regulating valve opening small, and the load response quick, which satis- fies the AGC＇ requirements.
出处
《热力发电》
CAS
北大核心
2014年第2期117-121,共5页
Thermal Power Generation
