Parameter self-tuning method for PID system

Abstract

The invention discloses a parameter self-tuning method for a PID system. The parameter self-tuning method for the PID system effectively prevents oscillation of a system output wave near a target value SV or deviation value (SV_n) in a self-tuning process, and excitation application on a control object is stopped only when a system sampling value PV reaches the target value SV, thereby guaranteeing that the system output wave always can reach and control the target value SV, and PID control parameters calculated by a controller are more accurate; besides, the self-tuning method respectively firstly acquires a working condition signal no matter how is a system initial state and then judges whether an excitation is applied to the control object according to comparison of an acquired value PVwith the deviation value (SV_n), namely working condition judgment of the method is prior to control output, the overshoot situation is effectively prevented from appearing, and an industrial accident is avoided from occurring; and a complete waveform, namely a corresponding period, is not required in the self-tuning process, and time of the self-tuning process is shortened, thus system self-tuning detection speed is improved, and the industrial accident is avoided from occurring.

Description

technical field

[0001] The invention relates to the technical field of automatic control, in particular to a parameter self-tuning method of a PID system. Background technique

[0002] In industrial process control, the control system that is controlled according to the proportion, integral and differential of the error generated by comparing the information collected by the real-time data of the controlled object with the given value is referred to as the PID control system. PID control has the advantages of simple structure, good stability, and reliable operation. It is still the most commonly used control method in industrial process control. The classic PID control method includes proportional regulation, integral regulation and differential regulation at the same time. Since the integral regulation often causes problems of overshoot or oscillation, an integral-separated PID control method appears in the prior art. The main principle is that the integral adjustment is ...