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

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

Abstract

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

CLC Number:

TK38

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.

Figures/Tables 9

Fig.1 Schematic diagram of valve layout

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

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

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

Fig.3 High pressure governing valve flow characteristic curve

Fig.4 Intermediate pressure governing valve flow characteristic curve

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

Fig.6 Speed control SAMA diagram

Fig.7 Optimized turning process curve

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