The Design Of The Controller For The Water Level Of Boiler Steam Drum Based On Fuzzy Theory

The boiler is a typical complex thermodynamic system. For steam boiler, maintaining water level of the steam drum in a certain range is the chief requirement to guarantee the boiler running safely. The water level control for the steam drum is all along a typical issue in the control domain. With the development of control theory and technology, there have been many control systems based on classical control or modern control theory applied to water level control of the steam drum. However, they are all established on the basis of the mathematical models of the objects being controlled. The mathematical model of the complexity of the water level of the steam drum often can not be obtained, so we often can not get the better effects. On the other hand if fuzzy theory is applied to design control system, we need not know the exact mathematical models of the objects being controlled. Thus, as to many complex systems whose exact mathematical models can not be established, we could get the better control effects. According to this, fuzzy theory is applied to design the controller of the steam drum water level in this paper.The dynamic characteristics of steam drum water level along with its traditional control technology and the fuzzy control theory have been detailedly analyzed in this paper. On the basis of these analyses, a scheme using fuzzy theory to control steam drum water level has been proposed, and designed the embed system with the core of C8051F040. What's more, a small system with keyboard input and Light Emitting Diode is designed for the system which has the function of signal collecting, data displaying, keyboard controlling, data computing.Three points are focused on this paper. Firstly, the control algorithm and control laws of the system are designed and realized. Secondly, the design of the hardware is described in this dissertation and simulation of control system is also performed to study the performance of fuzzy control by MATLAB. At last, the design of software is described in detail and some practical hardware and software reliability measures of embedded system are introduced. At...