The Central Heating System Of Heat Exchange Station Adaptive Decoupling Control Research

With the continuous updating and replacement of various scientific and technological means and management means,a variety of advanced technology and management methods are used in the central heating system of public buildings,the performance of the heating system has been strengthened and the efficiency of energy utilization has been enhanced,and the energy consumption of the system is gradually reduced,and the comfort in the building is also obtained.To improve.But at present,many old heating projects in China still rely on operation and maintenance personnel to rely on their inherent experience for rough manual regulation.However,with the replacement of equipment and technology,people's inherent understanding has not been updated in time,resulting in the failure of the system to reach its best state and continue to be reformed and upgraded.Heat transfer station system is a nonlinear,coupling,time-delay system characteristic.A separate use of the traditional PID controller control problem in the face of the heat exchanging station,and not the perfect solution.With the application of frequency conversion technology in the air conditioning system,the change of the two side flow of the heat exchange station system,the characteristics of the system have changed,and the new PID parameters need to be adjusted to control the quality and quantity of two channels of the heat exchange station.This paper studies the decoupling adaptive control of the heat transfer station.The control object is the heat transfer station of an office building in Beijing.Its heating load is mainly characterized by intense heat load in the early and late peak period,and low demand for heat load at weekends and at night.In order to optimize its control effect,control optimization and research are carried out in three aspects: modeling,decoupling and adaptive control.Finally,a set of control system composed of embedded industrial control computer and PLC is applied to heat exchanger station to compare and analyze before and after reconstruction.The main contents are as follows:(1)systematically describe the structure and basic principles of heat exchanger stations,analyze system dynamics and thermodynamics,and lay the foundation for subsequent modeling and control strategies.In the modeling,the transfer function structure is determined by the mechanism analysis of the equipment of the heat exchange station.The model parameters are obtained by the system identification method.The time-varying characteristics of the heat exchange station model are reflected by the superposition of the time variable in the model.(2)design and implement decoupling and adaptive controller for system characteristics and main problems.(3)according to the conditions of this project,we design the solution and build the hardware system and software platform.(4)apply the control system in engineering,record and analyze the results,summarize the results and make a prospect for the next step.