Research On 300MW Circulating Fluidized Bed Units Load Coordinated Control System Based On MD PID

With the progress of society, the rapid development of the national economy, as well as the power industry continues to progress on the automatic generation control power requirements, as well as people on the quality of the living environment of the electricity requirements also increasingly high up. Clean the end, we want to find an efficient、low pollution combustion power generation technology, circulating fluidized bed boiler technology fits this requirement. Each has advantages at the same time things are bound to have its shortcomings, but in a circulating fluidized bed boiler with a high efficiency, low pollution, but also to the automation control requirements brought a lot of insurmountable difficulties, so unit capacity large-scale, high standard steam parameters is a problem we must face is the main direction of future development. So many experts are on the circulating fluidized bed unit coordinated control has been studied, but the actual implementation of these studies have produced some limitations. And commercially now widely used in the industry are the traditional PID controller, the controller because of its large number of accused delay in the process that exists, the oscillation instability and other characteristics are difficult to overcome, and therefore can not meet the process requirements control effect, so that the entire unit is a big obstacle put in coordinated control automation. In this paper, introducing and absorbing traditional PID control technology based on the use of a new model-driven PID control technology.Model-Driven PID (MD PID) is only in recent years developed a new type of intelligent control technology. It is designed for large delay some of the accused during the existence of large lag, instability processes proposed previously proposed model-driven control of just one degree of freedom, in a subsequent study found that the use of two degrees of freedom PID control driver model has better control performance. Two degrees of freedom PID controller model driven mainly controlled object equivalent, consisting of the main controller and set point filter three parts, which is the result of the controlled object, such as compensation to compensate for the controlled object, so you can respond quickly to track the target, but also shorten the response time, but also has good anti-jamming capabilityFor 300MW circulating fluidized bed unit coordinated control system in the structure, principles and research components and control strategies, analyzes the main factors affecting the coordination control this paper Consider two degrees of freedom model driven PID control technology can solve the problem variability, as well as disturbances such as nonlinearity and uncertainty when circulating fluidized bed turbines, therefore, put forward some optimization principles designed PID control based on model-driven techniques coordinated control 300MW circulating fluidized bed units, and in working condition when part of a 300MW circulating fluidized bed unit, in the amount of coal under the main steam pressure disturbance dynamics approximate transfer function of the controlled object, and using MATLAB software simulation studies were carried out to its traditional PID control and model-driven technology, simulation from the graph can be drawn using two degrees of freedom model driven PID controller only has good tracking performance settings, but also has strong anti-interference and robustness. Meanwhile, the structure of the system is simple, easy to adjust parameters. Its control to reduce overshoot its control time was significantly shortened, which makes the main steam pressure control system to better meet the requirements of process parameters and scope of the actual production site, very easy to implement in the field of actual production has better guidance.