超临界抽汽式汽轮机解耦控制特性研究

Study on Decoupling Control Characteristics of Supercritical Extraction Steam Turbine

以某350 MW超临界抽汽式汽轮机为研究对象,根据其装配图和工况图确定了电负荷和热负荷的静态解耦矩阵,采用模块化建模的思想搭建了热电解耦控制系统及调节对象的仿真模型,并对联系调节和非联系调节的控制特性进行了仿真分析。结果表明:电负荷扰动时,通过调整高压调节阀和蝶阀的开度可以满足电负荷变化的需求;由于压力控制回路PI控制器积分作用的存在,消除了电负荷对热负荷的静态干扰;热负荷扰动时,解耦控制的作用消除了热负荷对电负荷的静态干扰;采用联系调节可以减小热负荷与电负荷之间的动态干扰,缩短过渡过程时间,改善系统的动态响应特性,实现热负荷与电负荷之间的静态解耦控制。

Taking a 350 MW supercritical extraction steam turbine as the object,the static decoupling control matrix of electrical load and heat load was determined according to its assembly drawing and working condition diagram.A simulation model of thermo-electric decoupling control system and its regulation objects was built based on the idea of modular modeling.The control characteristics of the connected and the non-connected regulation systems were simulated.Results show that the demand of electrical load change can be met by adjusting the opening of the high-pressure regulating valve and butterfly valve when the electrical load is disturbed.The static interference of the electrical load to the heat load is eliminated due to the integral action of the pressure PI controller.When the heat load is disturbed,the static interference of the heat load to the electrical load is eliminated due to the function of decoupling control.The application of connected regulation system can reduce the dynamic interference,shorten the transition process,improve the dynamic response characteristics,and finally realize the static decoupling control between the heat and the electrical loads.