1000MW超超临界机组调阀快关边界条件分析与应用

doi:10.12096/j.2096-4528.pgt.20004

发电技术 ›› 2020, Vol. 41 ›› Issue (6): 689-696.DOI: 10.12096/j.2096-4528.pgt.20004

1000MW超超临界机组调阀快关边界条件分析与应用

宋晓辉¹(), 梁恒¹(), 陈新明²(), 普建国¹(), 廖军林¹(), 伍刚¹(), 尹金亮³()

¹ 西安热工研究院有限公司, 陕西省西安市 710054
² 中国华能集团清洁能源技术研究院有限公司, 北京市昌平区 102209
³ 国家电投集团河南电力有限公司技术信息中心, 河南省郑州市 450000

收稿日期:2020-03-11 出版日期:2020-12-31 发布日期:2021-01-12
作者简介:宋晓辉(1989), 男, 硕士, 工程师, 研究方向为大型汽轮发电机组的调试及故障诊断, songxiaohui@tpri.com.cn
梁恒(1987), 男, 工程师, 研究方向为大型汽轮发电机组的热工调试与协调优化, lh-3314@163.com
陈新明(1989), 男, 硕士, 工程师, 主要研究方向为火电厂热力系统仿真、风电场流场仿真分析、风电机组性能检测评估等, xm_chen@qny.chng.com.cn
普建国(1979), 男, 工程师, 研究方向为大型汽轮发电机组的调试及故障诊断, pujianguo@tpri.com.cn
廖军林(1979), 男, 工程师, 研究方向为大型汽轮发电机组的调试及故障诊断, liaojunlin@tpri.com.cn
伍刚(1981), 男, 高级工程师, 研究方向为大型汽轮发电机组的调试及故障诊断, wugang@tpri.com.cn
尹金亮(1963), 男, 高级工程师, 研究方向为大型汽轮发电机组的研究及故障诊断, yjl19630520@163.com
基金资助:
国家重点研发计划项目(2019YFE0100100)

Analysis and Application of Fast Closing Boundary Conditions for Governing Valves of 1 000 MW Ultra-supercritical Unit

Xiaohui SONG¹(), Heng LIANG¹(), Xinming CHEN²(), Jianguo PU¹(), Junlin LIAO¹(), Gang WU¹(), Jinliang YIN³()

¹ Xi'an Thermal Power Research Institute Co., Ltd., Xi'an 710054, Shaanxi Province, China
² Huaneng Clean Energy Research Institute, Changping District, Beijing 102209, China
³ Technical and Information Center, State Power Investment Company Henan Electric Power Co., Ltd., Zhengzhou 450000, Henan Province, China

Received:2020-03-11 Published:2020-12-31 Online:2021-01-12
Supported by:
National Key Research and Development Program of China(2019YFE0100100)

摘要/Abstract

摘要：

某1 000 MW超超临界机组在冷态冲转过程中出现调阀频繁快关动作，造成阀体支撑晃动大，无法继续升速。针对这一问题，试运现场通过调整冲转参数、检查电磁阀油路、重新化验控制油油质等措施仍未得到解决。为此，从转速控制逻辑出发，分析快关动作发生的条件及调阀快关过程中比例积分（proportion integration，PI）调节量的变化，得出快关过程中影响总流量指令（即最终的阀位开度）最主要的因素是转速调节的前馈量变化，而并非是转速PI输出量的变化。依据这一分析，在不改变冲转参数、阀门流量特性曲线的条件下，计算出转速控制前馈量的边界值。通过多次尝试确立前馈量的最优值，避免控制逻辑中因参数设置不合理而触发调阀快关动作。优化后实际转速跟随设定值平稳上升，调阀开度线性开启，不再出现频繁摆动，达到升速控制的要求。

关键词: 超超临界机组, 频繁快关, 转速控制, 调节量, 前馈量, 最优值

Abstract:

The frequent fast closing action of the governing valve in a 1000 MW ultra-supercritical unit occurred during the cold running process, which caused the valve body to sway greatly and could not continue to speed up. The problem had not been solved by governing the impulse parameters, checking the solenoid valve oil circuit, retesting the control oil quality and other measures. Therefore, starting from the speed control logic, the conditions of fast closing action and the change of proportional integral (PI) regulating quantity were analyzed. It was concluded that the main factor affecting the total flow instruction (the final valve position opening) in the process of fast closing is the feedforward change of speed regulation, not the change of PI output. Based on this analysis, the boundary value of feedforward quantity of speed control was calculated without changing the impulse parameters and the flow characteristic curve of the valve. Through many attempts to establish the optimal value of feedforward quantity, the fast closing action of the governing valve can be avoided due to the unreasonable parameter setting in the control logic. After optimization, the actual speed rises steadily with the set value, the valve opening is opened linearly, and there is no more frequent swing, which meets the requirements of speed up control.

Key words: ultra-supercritical unit, frequent fast closing, speed control, regulating quantity, feedforward quantity, optimum value

中图分类号:

TK38

宋晓辉, 梁恒, 陈新明, 普建国, 廖军林, 伍刚, 尹金亮. 1000MW超超临界机组调阀快关边界条件分析与应用[J]. 发电技术, 2020, 41(6): 689-696.

Xiaohui SONG, Heng LIANG, Xinming CHEN, Jianguo PU, Junlin LIAO, Gang WU, Jinliang YIN. Analysis and Application of Fast Closing Boundary Conditions for Governing Valves of 1 000 MW Ultra-supercritical Unit[J]. Power Generation Technology, 2020, 41(6): 689-696.

图/表 9

图1 阀门布置示意图 1—主蒸汽进口；2—高压缸；3—主汽阀；4—主汽阀油动机；5—主调阀；6—主调阀油动机；7—进汽插管。

Fig.1 Schematic diagram of valve layout

图2 冲转过程调阀指令反馈的变化曲线 1—高压主汽压力；2—主汽温度；3—中压主汽门前压力；4—再热温度；5—真空；6—实际转速；7—高压调阀1号快关信号；8—高压调阀2号快关信号；9—中压调阀1号快关信号。

Fig.2 Change curve of command feedback of governing valve in the process of turning

表1 高压调阀流量特性数据

Tab. 1 High pressure governing valve flow characteristic data

高压调阀开度/%	高压调阀流量指令O_SFD/%
-29.84	-100.00
22.31	74.76
28.43	85.05
35.65	89.66
47.00	93.11
105.00	100.65

表2 中压调阀流量特性数据

Tab. 2 Intermediate pressure governing valve flow characteristic data

中压调阀开度/%	中压调阀流量指令O_SAF/%
-27.93	-100.00
17.05	61.05
23.05	72.53
31.00	80.35
37.42	83.65
105.00	101.31

图3 高压调阀流量特性曲线

Fig.3 High pressure governing valve flow characteristic curve

图4 中压调阀流量特性曲线

Fig.4 Intermediate pressure governing valve flow characteristic curve

图5 冲转过程中调阀快关动作曲线 1—转速偏差psf40；2—换算后的转速偏差比psf560；3—控制回路的前馈量n410；4—实际转速；5—设定转速；6—总流量输出指令ynprom；7—高压调阀1反馈；8—高压调阀2反馈；9—中压调阀1反馈；10—中压调阀2反馈。

Fig.5 Fast closing action curve of governing valve in the process of turning

图6 转速控制SAMA图

Fig.6 Speed control SAMA diagram

图7 优化后的冲转过程曲线 1—转速偏差psf40；2—换算后的转速偏差比psf560；3—控制回路的前馈量n410；4—实际转速；5—设定转速；6—总流量输出指令ynprom；7—高压调阀1反馈；8—高压调阀2反馈；9—中压调阀1反馈；10—中压调阀2反馈；11—高压调阀1号快关信号；12—高压调阀2号快关信号；13—中压调阀1号快关信号；14—中压调阀2号快关信号。

Fig.7 Optimized turning process curve

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1000MW超超临界机组调阀快关边界条件分析与应用

Analysis and Application of Fast Closing Boundary Conditions for Governing Valves of 1 000 MW Ultra-supercritical Unit

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