Analog PID control system and method based on digital prediction algorithm

Abstract

The invention provides an analog PID control system and method based on the digital prediction algorithm. The analog PID control system based on the digital prediction algorithm at least comprises a prediction module and a PID controller. The prediction module is used for predicting an analog reference signal through the digital prediction algorithm to obtain a first analog control quantity of an execution mechanism. The PID controller is used for obtaining a second analog control quantity of the execution mechanism by calculation according to input deviation obtained by subtracting a feedback signal formed by an analog signal output by the execution mechanism from the analog reference signal, and then controlling the analog signal output by the execution mechanism by adding the second analog control quantity to the first analog control quantity output by the prediction module. According to the analog PID control system and method, by the adoption of the hybrid control strategy of the digital prediction algorithm and analog PID, the initial deviation of the analog reference signal and the feedback signal is small, output of the PID controller will not be saturate easily, the control precision is improved, and the cost is lowered.

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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