摘要
电液伺服及执行机构为原动机调节系统的重要组成部分,其数学模型的精确度和适用性影响着整个电网仿真分析的准确性。分析现有的电液伺服及执行机构模型发现,模型在阀门小幅度动作时能很好地模拟系统性能,但是在阀门大幅度动作下,模型不能反映出实际情况,难以兼顾阀门不同幅度动作下电网的稳定性分析。文中在分析汽轮机执行机构工作原理的基础上,从各部件的物理意义出发,建立了一个新的用于电网稳定分析的电液伺服及执行机构模型。该模型用一套参数就能同时满足阀门不同幅度动作时电网稳定性分析的要求。最后给出了模型参数确定方法,并结合现场试验曲线,对模型进行了验证。
The electro-hydraulic servo and actuator system is one of the most important components in prime mover governing system. Precision and adaptability of the math model of the system significantly affect validity of power grid stability analysis. It is found that the existing models of the electro-hydraulic servo and actuator system can simulate the power grid performance properly when valves have small actions. However these models can not exactly reflect practice in case of large valve actions, so that they can not be used to analyze power grid stability while valve acts in large range. A new math model of the electro- hydraulic servo and actuator system is proposed based on operating principle of each component. This model is capable of evaluating the power grid performance at both small and large valve actions with one set of model parameters. Method of determining these parameters is provided, and the new model is verified by corresponding experimental data from the site.
出处
《电力系统自动化》
EI
CSCD
北大核心
2009年第3期98-103,共6页
Automation of Electric Power Systems
关键词
电网稳定分析
电液伺服及执行机构
数学模型
调节系统
grid stability analysis
electro hydraulic servo and actuator system
math model
governing system
