摘要
为解决多热电联产机组发电与供热、供汽负荷存在强耦合、对象兼有大惯性大迟延、系统时变非线性等多种复杂特性而难以控制的问题,采用机理分析方法建立某300 MW机组各主要动态环节的能量平衡微分方程,并依据设计和运行数据确定模型参数,建立了适用于全负荷工况的动态模型,并将机组实际输入信号引入模型,通过对比模型输出与对象实际输出曲线的误差,验证了模型的准确性。采用控制输入扰动仿真实验和工作点线性化的方法分析模型结构特点,阐述发电-供热-供汽负荷耦合特性及其在不同工况下非线性变化的规律。结果表明:对象耦合特性主要体现为中压缸排汽侧的三通耦合,非线性主要表现为输入对输出静态增益随工况点不同而显著变化的特性。
In order to solve the problems that multi-cogeneration units were difficult to control due to strong coupling between power generation and heating/steam supply loads, large inertia and large delay of objects, time-varying nonlinearity of the system and other complex characteristics, the energy balance differential equations of each main dynamic link of a 300 MW unit were established through the mechanism analysis method, and the model parameters were determined by using the design and operation data, then the dynamic model suitable for full load condition was established. By putting the actual input signals of unit into the model and comparing the curve error between the model output and the actual output, the accuracy of the model was verified. The simulation experiment of control input disturbance and the linearization method of operation point were used to analyze the structure characteristics of the model, the coupling characteristics of power generation, heating and steam supply, and the nonlinear variation law under different operation conditions. Results show that the object coupling characteristic is mainly reflected in the tee coupling on the exhaust side of the intermediate pressure cylinder, and the nonlinearity is mainly reflected in the characteristic that static gain from the input to the output changes significantly with different operation points.
作者
田亮
冯荣荣
TIAN Liang;FENG Rongrong(Department of Automation,North China Electric Power University,Baoding 071003,Hebei Province,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2022年第1期75-82,共8页
Journal of Chinese Society of Power Engineering
基金
国家重点研发计划资助项目(2017YFB0902100)。
关键词
多热电联产机组
动态模型
运行数据
工作点线性化
multi-cogeneration unit
dynamic model
operation data
operation point linearization
