某350MW超临界机组的系统辨识与仿真研究

System Identification and Simulation of a 350MW Supercritical Unit

搭建了某350MW超临界中间再热机组参与电网调频仿真模型,分别采用直接最小二乘法(直接LMS)和间接最小二乘法(间接LMS)进行模型的参数辨识,此外,提出了一种将电网负荷信号叠加到高、中压阀上同时参与电网调频的策略。仿真表明:两种辨识方法得到传递函数仿真曲线与试验运行基本一致;仿真模型设定电负荷扰动量5%,高、中压阀同时参与调频下,电负荷在第46s达到稳态值5%;单独高压阀时,电负荷在第55s达到稳态值5%。因此,机组高、中压阀同时可调相较于高压阀单独参与调频的特性和负荷响应能力显著提高。

In this paper,the grid-connection simulation model of a 350MW supercritical intermediate reheat unit is constructed,using direct least mean squarealgorithm(direct LMS)and indirect least mean squarealgorithm(indirect LMS)respectively to identify the parameters of the model.In addition,a power grid load signal is proposed to superimpose to high and medium pressure valves,while participating in power grid frequency regulation.The simulation shows that the simulation curve of thetransfer function is basically the same as that of the test run.the simulation model sets the electrical load disturbance by 5%,the high and medium voltage valves participate in power grid frequency regulationat the same time,the electric load reaches the steady state value of 5%at 46s,and the electric load reaches the steady state value of 5%at 55s when the high pressure valve is adopted alone.Therefore,the characteristics and load response capacity of the unit's high and medium pressure valves are significantly higher than that of the high-pressure valves used alonein power grid frequency regulation.