利用矩阵束算法提取水力机组参数的振荡特性  

Application of Matrix Pencil Method Extracting Oscillation Characteristic of Hydro-generating Unit Parameters

作　　者：曾保安[1] 曾云[1] 张立翔[1] 

机构地区：[1]昆明理工大学建筑工程学院工程力学系,昆明650500

出　　处：《大电机技术》2013年第5期45-50,共6页Large Electric Machine and Hydraulic Turbine

基　　金：国家自然科学基金项目(51179079);国家自然科学基金重点项目(50839003)

摘　　要：为了从水力机组参数的振荡信号中提取出模态信息(振幅、频率、衰减因子和相位角),本文将矩阵束算法(MPM)进行改进并提高了计算精度。通过建立系统的水力发电机模型,对各参数进行了仿真计算。进而将改进的MP算法用于提取各主要参数的振荡模态信息,并建立起各参数的运动模型和找出诱发机组振动的诱因。进一步探讨初始工况、扰动强度和扰动方向对振幅、频率和衰减因子的影响,分析振荡模态信息之间存在的耦联关系。仿真结果表明:矩阵束算法用于提取水力机组各参数模态信息是有效的、直观的,而且抗噪能力强、精度高。本文的研究方法为定量研究各主要参数的动力振荡特性提供方法依据。To extract the modal information（amplitude, frequency, attenuation factors and phase angle） from the signals of the parameters in the hydro-generating uint, this paper makes a development of the matrix pencil method to improve the precision of algorithm. By establishing the model of the whole system in the hydro-generating unit, a simulation of each parameter is carried out the parameters. The main oscillation modal information is extracted by using the modified matrix pencil method （MPM）. Based on these information, it builds the dynamic model of each parameter and finds out the inducing reasons why hydro-generating unit vibrates. This paper will carry out a further discussion about the influence of initial operation point, disturbed intensity and disturbed direction on the amplitude, frequency, attenuation factors, and analyze the coupling relationship of the modal information. The results demonstrate that the MPM is valid, illustrative when it is used to extract the modal information and it also has advantages of the high accuracy and anti-noise ability. The way in the paper supply reliable references for the quantitative study on the dynamic oscillation characteristics of the main parameters.

关 键 词：水力机组 矩阵束算法 振荡特性 参数耦联 模态信息 

分 类 号：TK730[交通运输工程—轮机工程]