Study On Flexible Coordinated Control System For Boiler-Turbine Units

The object of boiler-turbine units is to successfully assure the process of energy transition and energy current balance. The whole process of energy transition is a complicated process with compound input and output which is associated and coupled. The main conflict of coordinated control method based on boiler following turbine is inadequate energy supply, the method manifests that load rapid response and adaptability is good to electricity net rapid response, but main steam pressure fluctuates great, it is fit for taking part in adjusting the amplitude peak value of electricity net. The main conflict of coordinated control method based on turbine following boiler is slow energy supply, the method manifests main steam pressure fluctuate little, but load adaptability is bad, and it is fit for basic load. Based on run mode characteristics of boiler-turbine units, the text designs a flexible coordinated control system for meeting electricity net load instruction demand and ensuring the stabilization of boiler-turbine units. The system framework is brief, conveniently adjusting , and by adjusting a parameter α—energy-supply-and demands-harmonize-degree is able to meet different units, which makes coordinated control system split the differences between boiler following turbine and turbine following boiler, thus it satisfy different mission demand, which has reacted a develop trend of boiler-turbine units. As a result of the units and their work status are complex, it is difficult to set up an accurate mathematic model, and based on boiler great cunctative characteristic, the text adopts fuzzy controller as main controller of boilers and turbines. The project overcomes the dominating questions existing in PID control system. Basement fuzzy and flexible coordinated control system, a fuzzy control project based on amend gene is proposed in this paper to modification fuzzy controller dynamic and static state capability, and make it possess great apply range. Fuzzy rule depict through fuzzy control project based on amend gene. Measure gene and proportional gene are real time corrected through fuzzy control project with amend gene, which makes coordinated control system optimize to whole system. A control project based improving boiler following turbine and turbine following boiler coordinated control system gained to flexible coordinated control system, and flexible coordinated control system is simulated by computer, the simulation result shows that flexible coordinated control system can availably split the difference merit in boiler following turbine and turbine following boiler coordinated control system, satisfy different mission demands, and a units can gain great supply ranges. The flexible coordinated control system provides a new attempt and approach for control of units, and it is of value to reference.