Study of a Three-step Nonlinear Control Method for Electric Heating Boilers Based on Smith’s Predictor

Considering that the temperature of the electric boiler system is easy to overshoot and accompanied by hysteresis when working, that is, there are problems of unidirectional heating, large hysteresis and large inertia, a new model-based three-step controller is designed, and combined with the Smith estimator to compensate for hysteresis, time-varying, etc. The results of the experimental platform show that the newly developed Smith three-step nonlinear controller has smaller steady-state error, higher tracking rate and better control performance than the original PID-Smith-based controller.