Analog pid control system and method based on digital predictive algorithm

Abstract

The present invention provides an analog PID control system and method based on a digital prediction algorithm, wherein the analog PID control system based on a digital prediction algorithm at least includes: a prediction module for predicting the analog reference signal through a digital prediction algorithm , to obtain the first analog control quantity of the actuator; the PID controller is used to calculate the input deviation obtained by subtracting the analog reference signal from the feedback signal composed of the analog signal output by the actuator to obtain the The second analog control quantity of the actuator is used to add the second analog control quantity to the first analog control quantity output by the prediction module to control the analog signal output by the actuator. The invention adopts a digital prediction algorithm and an analog PID hybrid control strategy, the initial deviation of the analog reference signal and the analog feedback signal is small, the output of the PID controller is not easy to be saturated, and the control precision is improved and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of PID control, in particular to an analog PID control system and method based on a digital prediction algorithm. Background technique [0002] In the development history of industrial process control, PID (Proportional-Integral-Derivational, proportional-integral-derivative) control is the oldest and most vigorous control method in history, and it is also the most common control method so far. Because of its simple and clear structure, good robustness and wide application range, PID control is favored by the industry, and is increasingly valued by the control theory community. Even in industrially developed countries such as the United States and Japan, the loops using advanced control technology only account for a small proportion, and more than 90% of the control loops basically use PID control technology. [0003] Existing PID control technology mainly includes analog PID control and digital PID control...

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Problems solved by technology

[0007] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a digital predictive algorithm-based analog PID control system and method, which uses a digital predictive algorithm and analog PID hybrid control strategy to solve the problem of pure analog control in the prior art. PID control technology is easy to cause problems of excessive control amount and output saturation, and pure digital PID control technology requires high-precision analog-to-digital converters, high cost, and low control accuracy.

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