1000MW超超临界机组过热汽温控制设计

Design of Superheated Steam Temperature Control in 1000MW Super-supercritical Unit

为解决过热汽温定值扰动问题,针对外高桥第三发电厂1000 MW超超临界机组过热汽温被控对象的大惯性、大延迟等特性,基于Smith预估器原理,设计了一种改进型Smith预估器控制方法。Matlab仿真结果表明,所设计的控制系统在稳定性、快速性等方面优于常规串级PID控制系统,同时对同类超超临界机组过热汽温控制系统设计也具有很好的参考作用。

To solve the setpoint distrubance of temperature of superheated steam, aiming at the characteristics of the controlled object in Wai- GaoQiao Phase 3, 1 000 MW super-supercritical power unit, i. e. , large inertia and time lag; based on the principle of Smith predictor, the improved Smith preditive control method has been designed. The result of Matlab simulation indietaes that the control system designed is better than conventional cascade PID control system in stability and rapidity. The system is also valuable for reference in designing temperature control system of superheated steam for similar super-supercritieal power units.