抽水蓄能机组调速系统用流量控制装置设计

Flow control device of governing system for pump-storage units

因抽水蓄能机组工况多,并有额定水头高、引水和尾水管道流动规律复杂等原因,对导叶在不同工况下开启和关闭的速率控制要求不同于一般的水电机组。为可靠满足导叶开、关速率控制的特殊要求,本文以吉林敦化抽水蓄能机组调速系统用流量控制装置研制为背景,首先根据流动数学模型和软件仿真结果,给出了导叶在机组不同工况下开、关速率的调保计算要求。之后基于插装阀原理设计出满足此要求的流量控制装置,分析了该装置的工作原理、结构和设计特点,重点分析了装置在水泵和水轮机工况下事故停机时的导叶速率控制方式。最后通过试验,验证了装置功能的正确性和适用性,可为导叶多速率控制、机组事故停机和过速保护功能的设计提供参考。

A pumped-storage unit usually works in many different conditions at high water heads with complicated flows in its draft tube,and therefore the speed control requirement for its guide vane opening and closing is quite different from general hydropower units.To meet the requirement,this paper describes a method for guide vane opening and closing rate control under different working conditions that is derived through numerical simulations of regulating guarantee in a case study of the governing system in Jilin Dunhua pump-storage units.Then,we demonstrate the design of a new flow control device that meets the requirement and is based on the principle of cartridge valves,and analyze its working principle,structure,and design characteristics,focusing on the flow control method for accident shutdown in pump and turbine modes.Finally,the device is tested and verified through laboratory experiments showing its effective performance and applicability that improves the design of guide vane speed control,accident shutdown,and over speed protection functions.