Research on Control Strategy of Main Steam Temperature System of Thermal Power Plant Boilers

Abstract

This paper analyses the cascade PID control system used in the boiler on the main steam temperature system based on the introduction of the importance and control principle of the main steam system of the boiler, and propose a fuzzy PID control system for improving the cascade control system. As a consequence, the MATLAB simulation outcomes show that the system has better control effect and reaction speed, and the hysteresis of the main steam control system in the boiler is improved.

State variable-fuzzy prediction control strategy for superheated steam temperature of thermal power units

“…In addition, in view of the complex non-linear characteristics of the actual industrial control system, many applications of Takagi-Sugeno (T-S) fuzzy theory, predictive control algorithm and state observer have been involved in the SST control of thermal power units [7]. The main idea of the application of predictive control method is to reduce the complexity of calculation by directly identifying the parameters of the controller, so as to maintain the stability of the control parameters when more disturbances appear [8], As this method improves the large lag problem in industrial production fundamentally, it has been widely used in industrial production, such as the power production using advanced predictive control technology instead of the traditional PID regulation, speed up the boiler side feed water flow and fuel quantity regulation speed, reduce the fluctuation range of main steam pressure and separator temperature in the process of unit load lifting [9]. At the same time, as a typical method of modern control, researchers introduce the state observer into the main steam temperature system with large delay to replace the output feedback with state feedback, which fundamentally improves the dynamic characteristics of the system [10].…”