水轮机调速系统转矩系数分析

水轮机调速系统包括水轮发电机组对象和调速器,其小波动暂态的阻尼特性是影响机组稳定性的主要因素,本文对调速系统附加机械阻尼以及同步力矩的形成机理和计算进行了系统的研究。以典型调速器结构为例,建立包括机组对象和控制器在内的水轮发电机组线性化模型框架,给出了水轮机及其调速系统附加机械阻尼系数和同步力矩系数的计算方法。分析机组运动特性和阻尼系数的构成,定义了稳态和动态阻尼系数两种类型,并提出以机电振荡模式特征根近似计算机组自振频率的方法。仿真表明,适当调整调速器PID参数可以提高机组动态阻尼系数,本文所提出的计算方法是有效的。

Analysis of Torque Coefficients on Hydroturbine Governing System

Hydroturbine governing system is composed by the object system of hydroturbine generating sets(HTGS) and governor,its damping characteristics in small disturbance transient is a mainly factor for HTGS stability,the forming mechanism and calculating of its additional mechanical damping and synchronous torque are studied in this paper.Taking a classic structure of governor as case,the linearization model frame of HTGS is composed including the object system and governor,the calculation methods of torque coefficients for the additional mechanical damping and synchronous torque of the hydroturbine and its governing system are proposed.The steady state and dynamics coefficients are defined by analyzing motion characteristics of HTGS and composing of damping coefficients,and then the natural frequency of vibration of HTGS can be calculated approximately by the eigenvalue of electromechanical oscillation mode.Simulation results show that proper adjustments PID parameters of governor can improve the dynamic damping coefficient,the proposed calculation method is effective.