基于增广双线型模型的直流蒸汽发生器的稳定性分析

为了得到更精确的系统特性,在已有直流蒸汽发生器(OTSG)的系统模型方程基础上,用增广双线性模型来逼近非线性系统,并结合稳态计算的低功率情况下的参数,用Lyapunov理论对非线性系统做稳定性分析.结果表明,在功率一定时,系统随着压力损失系数的减小而趋于不稳定;随着功率的提升,预热段长度增加,系统不易发生密度波不稳定性问题.

Stability Analysis of OTSG Based on Augmented Vector Bilinear Model

In order to achieve the more precise system characteristics, this paper builds the model of the heat exchange process of OTSG based on the augmented vector bilinear system according to the lumped parameter differential equations afforded by the former researchers. It analyzes the stability of OTSG through Lyapunov theory in the light of the steadily parameters in some rating condition. The result shows that that system is vulnerable with the pressure loss coefficient dropping down when the power is fixed, and with the increasing of the power, the system is more steady because of the length of the preheated region getting longer