摘要
Abstract
Aiming at the problems of hardware aging,degraded control performance and non-compliance with current safety standards in the electrical part of the Kaplan turbine governor,which has been in operation for nearly 15 years in Letan Hydropower Station,a systematic upgrading and transformation was carried out to improve its reliability,control accuracy and intelligent level.On the premise of keeping the main mechanical structure unchanged,a series of technical measures were implemented through comparative analysis and logic analysis,including the 2-out-of-3 redundant logic transformation for guide vane and blade position sensors,the addition of automatic shutdown function upon power failure in accordance with the latest safety standards,the optimization of the water head update and guide vane segmented closing control logic,the newly added power upper limit locking function,and the improvement of the detection logic for main distributor refusal to act.The results show that after the transformation,the speed dead band of the system is less than 0.02%,the servomotor dead time is 0.168 s,the load rejection process is stable,all indicators are superior to the national standards,and the system reliability and regulation performance are significantly improved.The transformation has successfully realized the intelligent upgrading of the old governor system.The comprehensive strategy of"signal redundancy,logic softwareization and functional integration"provides an effective reference for the technical transformation of similar hydropower stations.关键词
轴流转桨式水轮机/调速器/智能化改造/冗余设计/现场试验Key words
Kaplan turbine/governor/intelligent transformation/redundant design/field test分类
建筑与水利
