两种亚临界机组负荷-压力简化模型对比及实验分析

对2种常见的亚临界机组负荷-压力简化非线性模型进行对比。理论及数据分析表明，2种模型主要区别在于：模型一燃料量对负荷及压力传递函数中包含非最小相位特性，并且能够更好地拟合汽包压力与汽轮机前压力间的差压。将机组实际协调控制系统逻辑移植到Matlab环境下并依据2种模型仿真整定控制器参数，然后将整定好的参数设置到机组协调控制系统中，模型一得到的参数控制效果明显优于模型二参数，并且实际控制效果较原参数有较大改善。

Comparison and Experiment Analysis of Two Simplified Load-Pressure Models of Subcritical Units

In this paper, the comparison between two simplified nonlinear load-pressure models is conducted for common subcritical units. The theoretical and data analysis show that the difference between the two models, is that the transfer function of load-pressure versus fuel quantity in Model 1 has non-minimum phase characteristics and can preferably fit the pressure difference between drum and throttle pressures. By transplanting the real coordinated control logics into the Matlab software and based on the simulation of the two models, the cotroller parameters are tuned and reset in the real coordianted control system. The result shows that Model 1 outperforms Model 2 substantially, and its control performance is greatly improved compared to the orginal parameters.