一种新的水轮机非线性模型及建模方法  

A New Nonlinear Modeling Method of Hydroturbine

作　　者：陈义宣 李玲芳 孙鹏 郭欣然 程远楚[2] CHEN Yi-xuan;LI Ling-fang;SUN Peng;GUO Xin-ran;CHENG Yuan-chu(Yunnan Grid Planning and Research Center,Yunnan Power Grid Co.,Ltd.,Kunming 650011,China;School of Power and Mechanical Engineering,Wuhan University,Wuhan 430072,China)

机构地区：[1]云南电网有限责任公司电网规划建设研究中心,云南昆明650011 [2]武汉大学动力与机械学院,湖北武汉430072

出　　处：《水电能源科学》2022年第1期158-162,共5页Water Resources and Power

摘　　要：水轮机具有强烈的非线性,建立准确的水轮机模型是电力系统动态特性仿真研究的前提。目前研究中水轮机模型大多采用简单的理想线性水轮机模型或IEEE水轮机模型,少部分采用基于综合特性曲线的非线性模型。前者难以描述水轮机非线性特性,后者需要准确的水轮机综合特性曲线。对此,提出一种新的复合非线性水轮机模型,通过力矩表插值法计算力矩,通过孔口出流方程计算流量。该模型与基于综合特性曲线的非线性模型在大波动甩负荷和小波动一次调频两种过渡过程下的仿真结果对比差距很小,说明该模型能够描述水轮机精确非线性动态特性。Due to strong nonlinear characteristic of hydraulic turbine,accurate mathematical model of hydraulic turbine is the fundament of dynamic study of power systems.The linear ideal model,the valve-equivalent model proposed by IEEE group and the nonlinear model based on comprehensive characteristic curves are the most widely used models.These models fail to describe the nonlinear characteristic or require the detailed characteristic curves.This paper proposed a new composite nonlinear hydroturbine model.The torque was calculated by interpolation of torque table.The flow was calculated by orifice outflow equation.The dynamic response of this model in large disturbance transient process such as load rejection and small disturbance transient process such primary frequency regulation is similar the response of real hydropower unit in field tests.It proved that this model is able to describe the nonlinear characteristic of hydroturbine.

关 键 词：水轮机模型 非线性 流量特性 力矩特性 

分 类 号：TK730[交通运输工程—轮机工程] TV734.1[动力工程及工程热物理—流体机械及工程]