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针对超临界直流锅炉在变负荷运行过程中被控对象参数不断发生变化的特点,将超临界直流锅炉看做具有不确定性的非线性系统,并根据部分分散控制方法对某600MW超临界机组简化模型进行了分析,充分论证了燃料量对中间点温度的动态特性单独建模的合理性.以超临界直流锅炉燃料量变化对水冷壁出口温度的影响为研究对象,进行动态机理分析并建立动态模型,通过计算在3个典型工况点处的传递函数,确定其不确定性模型的参数变化范围.将定量反馈理论应用到煤水比控制中,结合给定的设计性能指标计算出煤水比控制系统的反馈控制器和前置滤波器的参数.结果表明:锅炉中间点温度在不同负荷下都能较快地高精度跟踪给定信号,有较强的鲁棒性,控制性能良好且易于实现.
Aiming at the characteristics of supercritical once-through boilers constantly changing in the controlled variable during the process of variable load operation, the supercritical once-through boiler is regarded as a nonlinear system with uncertainties. According to the partial decentralized control method, a 600MW supercritical unit is simplified Model was analyzed to fully demonstrate the reasonableness of fuel quantity to model the dynamic behavior of midpoint temperature separately.With the influence of the fuel quantity of supercritical once-through boiler on the exit temperature of water wall as the research object, dynamic mechanism analysis and dynamic Model, the parameter variation range of the uncertainty model is determined through the calculation of the transfer function at three typical working conditions.The quantitative feedback theory is applied to the ratio of coal to water, and the coal water is calculated with the given design performance Than the control system feedback controller and pre-filter parameters.The results show that: the boiler midpoint temperature under different loads can be quickly and accurately tracking a given signal with high robustness, good control performance and Easy to implement.