应用系统辨识技术确定水轮机蜗壳流量系数K值的新方法

A new method based on system identification to determine the discharge coefficient K of scroll case

本文在系统辨识原理的基础上,提出了一种在线确定水轮机蜗壳流量系数K的新方法,经计算机仿真试验检验,其精度不低于1.0％.通过水电厂的现场试验,说明本方法具有良好的实用前景.整个试验工作可在基本不影响机组正常运行的条件下进行,为原型水轮机的流量测量及效率试验开辟了一条新的简易途径. 文章分别研究了确定K值的两种工作方式,因此为各种运行情况下水轮机过流量的确定提供了现实可行的方案.

Based on the system identification theory, a new method to determine the discharge coefficient K of scroll case is presented in this paper. Corresponding to the two operating modes of hydraulic turbine generator set, either in power system or in isolated state two ways to obtain the value of K are discussed. Imitated test in computer proves that the results will give an accuracy of 1.0%. The prototype test was performed in hydroelc-tric power plant and the results were compared with current meter method. It is shown that the new method did not affect the normal operation of turbine, so it opens up broad prospects for measuring turbine flow in practice.