Abstract
为了分析锅炉汽水系统非线性特性，基于面向对象无因果建模语言Modelica建立了锅炉汽水系统二阶和四阶Modelica模型，并在Dymola平台上进行了仿真。在计算水和水蒸汽热力性质时充分利用了Modelica标准函数库。由于模型中存在无法直接测量的参数，以50%负荷下热量增加10 MW时压力和水位阶跃响应特性曲线为依据，通过计算测量变量与对应变量仿真结果在各个测量时间点上的残差平方和，并以该值的最小化为目标对参数进行标定，通过标定提高了模型的可信度。 In order to analyze the nonlinear properties of boiler water-steam system, second-order and fourth-order model is presented by using object-oriented and acausal modeling language, Modelica, and the corresponding simulation is made on the platform of Dymola. For calibrating the model parameters which cannot be measured directly, the residual sum of squares between simulation results and measured data from a real device is calculated and the minimum is taken as the criterion based on pressure and water level responses to a step in fuel flow rate of 10MW at medium loads. After calibrating, the reliability of the model is improved.
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