Reseaech And Application Of Heat Supply Controll System For Small Soild Thermoelectric Heating Equipment

The utilization of clean energy to replace coal-fired heating and achieve clean heating has gained a great attention in the fight against haze.Electric heating equipment with solid-state storage has several advantages over traditional heating methods,and it is critical in boosting electricity to shift peaks and valleys and coal to electricity projects.The majority of existing solid storage electric heating equipment control systems use a PLC with a PID control method;however,this control system is more expensive,less stable,has slow operation regulation,and has poor anti-interference ability,making it unsuitable for small systems and high system control performance requirements.In conclusion,this thesis offers a low-cost,high-performance control system that employs a microcontroller as the control center,a fuzzy PID as the primary control strategy,temperature sensors to collect real-time operating data,and a touch screen for local monitoring.This thesis’ work consists of the following components:Firstly,the working principle of the solid-state electric heating equipment is described in detail.Next,the system’s characteristics are examined in relation to the operating principle,and a dynamic mathematical model of heat transfer is established,demonstrating that the system is a large hysteresis with time-varying uncertainties.It is challenging to achieve the system’s fast reaction requirements using solely PID control.The decision is taken to employ the fuzzy PID algorithm to manage the water supply temperature on the heat exchanger’s secondary side,and the fuzzy PID implementation method is described.A control strategy and scheme for automatic heat storage and automatic heat supply is provided based on an analysis of the control system’s functional needs.The automatic heat supply control strategy is based on fuzzy PID control as the core,which changes the water supply temperature on the secondary side of the heat exchanger by changing the fan frequency while keeping the circulation pump flow rate constant,and the fuzzy PID implementation process is studied.Secondly,the sensors and microcontroller models were chosen,based on which the overall control system architecture was proposed and the hardware circuit was developed.The controller hardware circuit uses the functional module circuit design idea,with distinct circuit boards for the many functions to be developed,a main board,an open-in board,and an open-out board,and RS485 communication between the main and slave boards.The STM32F407VET6 chip with high cost performance is employed as the main control unit for the main board to meet the control needs.The open-in and open-out boards are controlled by the STC15W4K48S4 microcontroller.Thirdly,control logic-based software programming.The MDK5 software platform was used to complete the main board programming.To complete the open-in board and open-out board program design,use Keil u Vision4.To realize on-site control and maintenance of the equipment,the touch screen monitoring interface design was completed using the MCGSE configuration software platform.Debug and test the overall performance of the controller’s functional modules to ensure that the controller meets the functional requirements and performance indicators.Finally,by combining fuzzy PID control and standard PID control in the same simulation program,Simulink simulations are utilized to validate the viability of the fuzzy PID algorithm.The results reveal that the fuzzy PID control system described in this study has a greater anti-interference capability,a shorter regulation time,and a smaller overshoot,all of which can help solve difficulties with existing solid-state electric heating systems.