浙江电力

2021, v.40;No.303(07) 96-102

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660 MW机组甩负荷试验转速二次飞升原因分析及处理
Cause Analysis and Treatment for Secondary Speed Rise in Load Rejection Test of a 660 MW Unit

张新胜,宋佳辉,丁宁,翁景
ZHANG Xinsheng,SONG Jiahui,DING Ning,WENG Jing

摘要(Abstract):

针对某660 MW超超临界机组甩负荷试验时转速出现二次飞升的问题,对该机组甩负荷控制原理进行了详细分析。从DEH(汽轮机数字电液控制系统)功率控制回路PID控制器输出、功率控制回路流量指令基准线和功率控制回路一次调频前馈3个方面进行分析,指出甩负荷试验后转速二次飞升的主要原因为触发甩负荷C20后,DEH功率控制回路PID输出的流量指令未超驰至0,导致在C20复位后,阀门流量指令仍有残留的正值,高、中压调门再次开启。因此,提出对功率控制回路PID输出及功率控制回路一次调频前馈的上、下限值进行优化,确保C20复位前总阀位流量指令切除到0,防止C20复位后总阀位流量指令将高、中调门再次开启引起转速二次飞升。最后,通过试验验证了该方法的有效性,为同类型机组的控制逻辑优化以及运行调试提供了参考。
In view of the secondary speed rise during the load rejection test of a 660 MW ultra-supercritical unit, the load shedding control principle of the unit was studied in detail. The paper analyzes power control loop of PID controller output of DEH(digital electro-hydraulic) control system, power control loop flow command reference line, and power control loop primary frequency modulation feedforward. the paper indicates that the main reason for the secondary speed rise after the load rejection test was: after load rejection command C20 was triggered, the DEH power control loop PID output flow command did not override to 0. As a result, after the C20 is reset, there were residual positive values in the valve flow command, and the highpressure and medium-pressure control valves were reopened. Therefore, the paper suggests optimizing the PID output and upper limit and lower limit of primary frequency regulation feedforward, ensuring the demand of the general valve was switched to zero before C20 is reset and preventing secondary speed rise due to reopening of the high-pressure and medium-pressure control valves. Finally, the effectiveness of the method is verified, which can be used as a reference for control logic optimization and operation commissioning of similar units.

关键词(KeyWords): 甩负荷试验;汽轮机转速;C20复位;二次飞升
load rejection;turbine rotation speed;C20 reset;secondary speed rise

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金联合基金项目(U1809207)

作者(Author): 张新胜,宋佳辉,丁宁,翁景
ZHANG Xinsheng,SONG Jiahui,DING Ning,WENG Jing

DOI: 10.19585/j.zjdl.202107016

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