Temperature Nonlinear Control Parameter Self-tuning Technology for Thermal Storage Electric Boiler
In order to achieve a balance between the steady-state and dynamic characteristics of a thermal storage electric boiler,and to address the issues of large hysteresis in the temperature control system,poor robustness of overshoot control,and low efficiency of control parameter self-tuning,a nonlinear control parameter self-tuning technology for thermal storage electric boiler temperature is proposed,with steady-state deviation as the main corrected parameter.Based on the principle of thermal storage electric boilers,clarify the equipment structure and work-ing mode.Analyze the structure and temperature conduction mechanism of a thermal storage electric boiler,calculate the heat generated by the heating resistor,the heat storage capacity of the solid thermal storage material,the thermal efficiency of the thermal storage body,and select the circulating fan to obtain the thermal efficiency.Characterize the degree of temperature nonlinearity,use the thermal efficiency as a feed-back indicator,introduce the discrete time PID algorithm,and combine the three controllers of nonlinear,hysteresis,and inertia characteristic transmission results to analyze the steady-state deviation and steady-state deviation change rate,compare the effects of different control parame-ters on dynamic response characteristics and steady-state performance,perform online correction on each parameter,and complete nonlinear control parameter self-tuning.The experimental results show that after the application of this technology,the adjustment time for the 40 ℃ re-sponse process of the electric boiler is 150 seconds,the overshoot is 12％,the adjustment time for the 60 ℃ response process of the electric boiler is 200 seconds,the overshoot is 15％,and the steady-state deviation is 0.Capable of achieving non-linear temperature control parame-ter self-tuning for thermal storage electric boilers,with fast response time and excellent overall stability performance.
thermal storage electric boilertemperature nonlinear controlPID controllerparameter self-tuningsteady state temperature
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