带调压室的转桨式水轮机调节系统稳定性研究

Study on Stability of Regulating System for Kaplan Turbine with Surge Chamber

采用线性控制系统稳定性理论,研究了带调压室的转桨式水轮机调节系统的稳定性,分析了协联条件、接力器时间常数Tz和导叶至桨叶转换系数Kk对系统稳定性的影响。结果表明,非协联调节工况下的稳定域及机组转速调节品质均优于协联调节工况,且随Tz的增大、Kk值减小,系统稳定域越大,为调速器参数的选择提供了理论依据。

By using stability theory of linear control system,this paper studies the stability of regulating system for kaplan turbine with surge chamber and analyzes the impact of on-cam condition,servomotor time constant Tz and conversion coefficient Kk between wicket gate and propeller blade on the stability of the system.The result shows that the stability and the speed adjusting quality of unit in on-cam condition are better than those in off-cam condition;furthermore,with the increasing of Tz and decreasing Kk,the stability domain of the system becomes larger.Thus,it provides theoretical basis for selection parameters of governor for kaplan turbine.