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Control Method of Steam Turbine Shutdown and Shutdown System Based on Fault Critical Removal Time

A technology of critical cutting time and control method, which is applied to mechanical equipment, engine components, machines/engines, etc., can solve the problems of control logic and quick-close misoperation of steam turbine door-adjusting and fast-closing systems, and achieve avoidance of adverse effects, The effect of shielding fluctuations and preventing functional malfunction events

Active Publication Date: 2019-08-09
ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology only designs the corresponding strategy of fast closing steam valve for a specific power grid fault, and does not study the control logic and fast closing misoperation of the steam turbine door fast closing system under the fault of the power grid line

Method used

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  • Control Method of Steam Turbine Shutdown and Shutdown System Based on Fault Critical Removal Time
  • Control Method of Steam Turbine Shutdown and Shutdown System Based on Fault Critical Removal Time
  • Control Method of Steam Turbine Shutdown and Shutdown System Based on Fault Critical Removal Time

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Embodiment Construction

[0025] Below in conjunction with accompanying drawing and specific embodiment the invention is further introduced:

[0026] Such as figure 1 As shown, taking a 600MW unit produced by Harbin Steam Turbine Factory as the research object, when the power system fails and generates instantaneous fluctuations, the control logic of the valve and quick-closing system first controls the exhaust pressure of the medium pressure cylinder and the active power of the generator. The power is measured and the per unit value is taken to compare the difference. Only when the difference between the two is greater than -1 and less than 1.5, the data is considered accurate before subsequent judgment is made. Otherwise, the judgment logic will jump out and the system will report an error. If the difference is greater than 0.39, the overspeed protection (OPC) command will be triggered. If the difference is greater than 0.3, proceed to the next step of judgment; judge the signal of the steam turbine...

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Abstract

The invention discloses a turbine control valve quick-closing system control method based on fault critical mute time. On the basis of original triggering logic for a turbine control valve quick-closing function, judgment of power system fault types and selection of delay time are added. Turbine control valve quick-closing function triggering conditions under different faults are determined through analogue simulation of transient faults of a power system, and thus the optimum control valve quick-closing action delay time of different power generators under the active power (a per-unit value)is determined through analogue simulation of three-phase short troubles of the power system and according to fault critical mute time and power plant earth fault current disappearing time. By adoptionof the control method, fluctuation of transient abnormal power signals can be shielded, adverse effects on safe operation of a unit caused by delay during unit sudden load change can also be avoided,and safety and stability of the power system are effectively guaranteed.

Description

technical field [0001] The invention relates to the field of supercritical steam turbine control systems, in particular to a control method for a steam turbine door-adjusting and fast-closing system based on fault critical removal time. Background technique [0002] With the connection of UHV transmission to the grid, the complexity of the power system increases. In this case, the possibility of grid failure increases, thereby reducing the transient stability of the power system. Due to the continuous increase of the unit capacity in recent years, the moment of inertia of the shafting of the large turbogenerator unit has decreased, and the soaring speed of the unit under dynamic disturbance is relatively high. After the disturbance occurs and the disturbance is eliminated, the ability of the unit to maintain synchronization is reduced. The fast closing function of the steam turbine gate of the large steam turbine generator set is an effective measure to improve the transient...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D17/00F01D21/00
CPCF01D17/00F01D21/00
Inventor 王锁斌邓彤天钟晶亮王家胜张世海徐章福
Owner ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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