Study on Switching Performance of High Profile Valve Control Mode Under Fault Condition of High Power Turbine
Undisturbed switching is an important function in the governing valve management of large steam turbines.Most of the current research on undisturbed switching mainly focuses on its realization method in the normal state,especially when it is connected to the grid.To investigate the flexibility of thermal power units,this study takes multiple 600 MW-class units as its subject of research.It conducts fault diagnosis and implements optimization measures targeting the valve management deficiencies in these units,enabling the units to safely and smoothly adopt the sequential valve steam distribution mode.On this basis,experimental research on uninterrupted switching under two types of abnormal operating condi-tions is conducted,exploring the rapid response capability of uninterrupted switching under fault condi-tions and the impact of equipment faults on its implementation.The experimental results indicate that op-timizing valve management not only enhances the unit's ability to respond to faults,but also reduces the sensitivity of units switching control system to auxiliary equipmen failure.This finding offers valuable in-sights for improving the safety and stability of power units under fault conditions.
turbo-generator setvalve management failuresteam distribution lawoptimization and transformationundisturbed switchingequipment failure
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