摘要
通过实验和对运行数据的统计分析,确定1台660MW机组在50%～100%负荷范围内负荷/压力对象的简化非线性动态模型和模型中主要参数的变化规律.在此基础上对非线性模型进行线性化,获得不同负荷/压力工作点时的线性化模型,并发现其增益、惯性、非最小相位特性随工作点变化.分析表明,机组负荷/压力模型的相对非线性度随工作点均匀变化;模型非线性对系统影响主要体现在燃料指令对机前压力增益和锅炉蓄热惯性的变化上.对模型非线性特性分析的结论,可以为协调控制系统设计提供依据.现有协调控制系统中增益调度、发热量校正可以在一定程度上克服非线性的影响.
The simplified nonlinear dynamic model for 100% load range as well as the rules of variation the load-pressure characteristics of a 660MW unit in the 50% of the main parameters in the model have been determined experimentally and also by statistical analysis of operating data. This nonlinear model was then linearised, and linearised models for different load-pressure conditions obtained; whereby it was found that its increment, inertia and the non-least phase characteristic vary with changing point of operation. Analysis indicates that the measure of relative nonliearity of the load-pressure model varies uniformly with changing point of operation. The effect of the model＇ s nonlinearity on the system is mainly reflected by changes of fuel command corresponding to pressure increments in front of the turbine and heat storage inertia of the boiler. Conclusions obtained by the analysis on the nonlinear characteristics of the model may be used as a reference for designing coordinated control systems and also for considerations of how to quell, to a certain extent, the effect of nonlinearity on incremental load regulation and heat release emendations in existing coordinate control systems. Figs 2, tables 2 and refs 5.
出处
《动力工程》
EI
CSCD
北大核心
2005年第4期533-536,540,共5页
Power Engineering
关键词
自动控制技术
动态模型
非线性
火电机组
协调控制
automatic control technology
dynamic model
nonlinearity
thermal power set
coordinated control
