串级PID控制系统设计优化及应用研究：以火电厂锅炉过热汽温控制为例【精品文档】

nity of the unit. Its performance and reliability have become important factors to ensure the safety and economy of the unit. When the superheated steam temperature is high, the thermal efficiency of the unit is relatively high, but when it is too high, the metal materials of the turbine cannot withstand it, and when the temperature is too low, it affects the efficiency of the unit. The stability of the superheated steam temperature is very important for the safe and economically operation of the unit, so there are high requirements for its control. However, due to the superheated steam temperature being a typical complex system with large delay, large inertia, nonlinearity, and time variance, this design adopts cascade control to improve the control performance of the system. A master control-cascade control switching device is used in the system to adapt to different working environments. With the use of this system, the outlet steam temperature of the boiler superheater can be controlled within the allowable range and protect the superheater from exceeding the allowed operating temperature. Keywords: superheated steam temperature, desuperheating water, cascade control system, PID In conclusion, the design of the superheated steam temperature control system in a thermal power plant boiler is crucial for the safe and efficient operation of the unit. By implementing a cascade control system with a master control-cascade control switching device, the system can effectively regulate the superheated steam temperature within acceptable limits while protecting the superheater from overheating. This design not only enhances the control performance of the system but also ensures the safety and reliability of the unit. Overall, the superheated steam temperature control system plays a vital role in optimizing the performance of the thermal power plant boiler and is essential for maintaining the stability and efficiency of the unit.