The Design Of The Superheated Steam Temperature Control System Based On DSP

In coal-fired power plants, the superheated steam temperature control system for thermal power units is an important and indispensable component of their performance and reliability have become the thermal power units to ensure safety and economy of an important factor. Superheated steam temperature is high, the unit is relatively high thermal efficiency, but too high, the steam machine and can not afford metal materials, the temperature is too low then the efficiency of affected units. Superheated steam temperature of the stability of the unit safe and economic operation is very important, so the higher their control requirements.However, due to superheated steam temperature is a typical large delay, large inertia, nonlinear and complex time-varying systems, the use of classical control theory to control a number of shortcomings exist. In this paper, conventional PID control based on the conventional PID and fuzzy PID technology of composite control strategy. The strategy used in DSP-based controller as the core of the control system, controlled by the amount of water by water, superheated steam in order to achieve effective control of temperature.First, by introducing the thermal power plant main steam system of the process, to illustrate the superheater arranged in the boiler. Further analysis of the impact of changes in steam temperature factors, as well as characteristics of the object to illustrate the extensive use of water by the current temperature as a means to control the causes of steam temperature, which has been used in the design of control strategies. Again on the fuzzy control technology, composition, structure, principle, introduced in order to make the design of the fuzzy-PID controller, and introduced the DSP and fuzzy-PID algorithm for the combination of the compound. Selected a large delay, large inertia, using the current conventional PID controller and the DSP based on this paper, the fuzzy-PID controller to control the selection of objects, and to compare simulation results to illustrate this paper, the control the effectiveness of the strategy; at the same time through the simulation of MATLAB to illustrate the design of the control system of this paper, the superiority; Finally, the control system hardware and software design framework for the design, as well as the valve control signal output. In this paper, the DSP will be used to achieve control by water level control system of the "override" control, and secondary water control system by fuzzy-PID control, the DSP controller for superheated steam temperature control system, the main regulator.The simulation results show that the DSP based on the use of the superheated steam temperature control system has better adaptive ability to control the quality and robustness are much better than conventional PID control system. Even the parameters of the object the larger the changes and system disturbances, the system can still ensure a good dynamic and static properties, to temperature control of superheated steam to play the role of good...