Setting time and device for OPC resetting time of steam turbine
A technology for resetting time and steam turbines, applied in mechanical equipment, engine components, machines/engines, etc., it can solve problems such as secondary rise of steam turbine speed, tripping of units, threatening the safe operation of generators, etc., and achieve the effect of high precision
Inactive Publication Date: 2015-05-27
STATE GRID CORP OF CHINA +1
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Problems solved by technology
[0003] After the OPC action is completed, the OPC starts to reset. If the OPC is reset too early, that is, the time for the control valve and the reheat regulator to be opened again is too early, the turbine speed is likely to cause a secondary surge, causing the unit to trip, threatening the safety of the unit; if the OPC is reset If it is too late, the speed of the unit will drop too much, which will increase the risk factors of unit operation, even threaten the safe operation of the generator, and create unfavorable factors for the unit to quickly return to the grid-connected state
[0004] Therefore, how to adjust the OPC reset time of the steam turbine is an important link to ensure the safe operation of the steam turbine. At present, the OPC reset time of the steam turbine is usually set according to experience, and the setting accuracy of the OPC reset time of the steam turbine is low.
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[0037] At present, when the child page is displayed on the parent page, if the child page dynamically increases or decreases, the height of the window used to display the child page has been fixed in the parent page, which will cause the child page to not be fully displayed or the page display window wasted space.
[0038] see Figure 1 to Figure 2 , figure 1 A schematic flow diagram of an embodiment of a method for setting the OPC reset time of a steam turbine according to the present invention, figure 2 It shows the curve relationship graph of each main parameter of the steam turbine.
[0039] Depend onfigure 1 It can be seen that, in this embodiment, the method includes:
[0040] 101: Obtain a power decay function of the steam turbine to be tested after it is disconnected from the grid.
[0041] figure 2 Curve A in the middle is the power attenuation function after the steam turbine is disconnected from the grid. in, figure 2 The br grid-connected signal in , when...
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The invention discloses a setting time and device for OPC resetting time of a steam turbine. A piecewise linear function is used for replacing a power attenuation function of the steam turbine, and the piecewise linear function is revised; the piecewise linear function is used for calculating the time from an offline state to a highest rotary speed of the steam turbine to be detected. Furthermore, the OPC resetting time of the steam turbine is calculated according to coasting operation time from the highest rotary speed of the steam turbine to a pre-set lowest rotary speed, and the time from the offline state to the highest rotary speed of the steam turbine to be detected. Compared with the prior art, the OPC resetting time of the steam turbine is set according to an actual operation condition of the steam turbine and the precision is higher.
Description
technical field [0001] The present application relates to the field of steam turbine control, and more specifically, relates to a method and device for setting the OPC reset time of a steam turbine. Background technique [0002] When the steam turbine started by the high-pressure cylinder is off-grid, the turbine speed soars, and when the OPC signal (that is, the overspeed protection signal) starts to act, the regulating valve and reheat regulating valve of the steam turbine begin to close, and the turbine speed begins to drop. [0003] After the OPC action is completed, the OPC starts to reset. If the OPC is reset too early, that is, the time for the control valve and the reheat regulator to be opened again is too early, the turbine speed is likely to cause a secondary surge, causing the unit to trip, threatening the safety of the unit; if the OPC is reset If it is too late, the speed of the unit will drop too much, which will increase the risk factors of unit operation, ev...
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IPC IPC(8): F01D17/00F01D17/10
Inventor 胡洲张宝吴文健顾正皓
Owner STATE GRID CORP OF CHINA