热电联产机组与热网的耦合特性分析与仿真

Analysis and Simulation of Coupling Characteristics Between Cogeneration Unit and Heat Supply Network

为研究热电联产机组与供热管网之间存在的耦合特性,建立了330 MW抽汽式热电联产机组的精确模型,以及5路并联的多级供热管网和热用户的模型。采用控制输入扰动仿真,分析了机组模型结构特点和动态特性;通过传统炉跟机协调控制与供热测PID控制,分析了热电联产机组和供热管网之间的瞬态特性。仿真结果表明,供热管网中存在较强的热惯性,调节热负荷能够快速改变发电负荷的动态响应,说明利用热网的热惯性可以提高热电联产机组的调频调峰能力。

In order to study the coupling characteristics between the cogeneration unit and heat supply network,an accurate model of a 330 MW extraction steam cogeneration unit,and a model of a 5-way parallel multistage heat supply network and heat users are established.Using the simulation experiment of control input disturbance,the structural and dynamic characteristics of the unit model are analyzed.Through the traditional boiler following turbine-coordinated control and heating measurement PID control,the transient characteristics between the cogeneration unit and the heating pipe network are analyzed.The simulation experiment shows that there is strong thermal inertia in the heating pipe network,and adjusting the thermal load can quickly change the dynamic response of the power generation load,which indicates that using the thermal inertia of the heating network can improve the frequency regulation and peak shaving ability of the cogeneration unit.