水电站球阀液压系统建模及动态过程分析

Modeling and Analysis of Dynamic Process of Ball Valve Hydraulic System of Hydropower Station

鉴于当前水电站球阀液压系统设计仍沿用国外设计,凭经验修改,缺乏科学依据,设计冗余度较大,针对球阀液压系统各元件建立数值计算模型库,并结合液压元件动力特性试验数据确定各模型参数。根据水电站球阀液压控制系统实际工作过程及要求建立数值计算模型,获得球阀典型工作过程中液压系统各元件及节点参数的动态变化过程,在此基础上分析管道长度对系统动态特性的影响。结果表明,该建模及计算方法可为水电站球阀液压控制系统的精确设计和元件参数的合理选取提供理论依据。

At present,the design of the ball valve hydraulic system of hydropower station is still in use of foreign designs,and modified based on experience.It is lack of scientific basis,and the redundancy of design is relatively large.In this paper,numerical models libraries for each element of ball valve hydraulic system were established.And the coefficients of each element were obtained from its dynamic performance experiments.The system model was established based on the real working process and requirement of ball valve hydraulic control system.From this model,the detail changes in the whole process of elements and nodes were obtained.Finally,the influences of pipe length on the dynamic characteristics of control system were analyzed.The results show that the model and calculation method can provide theoretical basis for the precise design and reasonable selection of parameters of ball valve hydraulic system.