Research And Design Of Electromagnetic Heating System And Control Strategy

Compared with traditional heating technology,electromagnetic induction heating technology has the advantages of environmental protection,safety,energy saving and high thermal efficiency.It plays an increasingly important role in various industries and has a wide range of application prospects.Most of my country’s winter heating uses non-clean energy.The emission of pollutants will increase the frequency of smog and weather,affecting people’s physical and mental health.With the vigorous promotion of the national coal-to-electricity policy,energy-saving and environmentally friendly electromagnetic heating technology can be applied to the heating industry,and safe and reliable electromagnetic heating power supplies can be designed.In this paper,the district’s 1000m2 heating plan is taken as the research object,a suitable electromagnetic heating power supply is designed,and the control strategy of the power supply and hot water boiler is analyzed and studied.This article first introduces the heating principle and characteristics of induction heating power supply,analyzes the main circuit structure of induction heating power supply,selects series resonance scheme on the inverter side through comparative analysis,and adopts three-phase uncontrolled rectification scheme on the rectification side.Introduced the power adjustment method of the induction heating power supply.On the basis of summing up the advantages and disadvantages of various power adjustment methods and applicable scenarios,the inductive shift PWM power adjustment scheme was selected,and the series and parallel resonant load characteristics and inductive shift were studied.PWM power regulation characteristics and inverter working status.Then it introduces the load resonance frequency tracking technology.The digital processing chip DSP is used to design the software phase-locked loop,which is combined with the inductive shift to PWM power modulation,which reduces the use of analog circuits and improves the anti-interference and reliability of the system.The boiler water temperature control strategy is studied.Compared with the influence of traditional PID control,fuzzy control and fuzzy PID control strategy on the dynamic performance of the system,the fuzzy PID control strategy is selected,which combines the advantages of PID controller and fuzzy controller,suitable for Temperature control of this hysteretic,non-linear system,the dynamic performance of the systemhas been significantly improved.Then the hardware design and program flow design of induction heating power supply are carried out.According to the design goal of 100kW/20 kHz,the parameters of components used in the rectification link,inverter link and load resonance link in the system are calculated.The peripheral hardware circuit of the system is designed,including the minimum circuit to make DSP work,IGBT drive circuit,signal conditioning circuit,surge protection circuit,etc.The program flow design mainly includes the main program flowchart and the corresponding sub-module flowchart design.Finally,MATLAB/Simulink was used to build a simulation model of the power supply system.The main circuit of the system and the control strategy of the shifting power regulation were simulated and studied,and the rationality and correctness of the scheme were determined.