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Cascading gain self-scheduling PID (Proportion Integration Differentiation) controller

A self-scheduling and controller technology, applied in the direction of electric controllers, controllers with specific characteristics, etc., to achieve the effects of reducing dynamic deviation and static deviation, good robustness, and shortening transition time

Active Publication Date: 2015-03-18
GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
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Problems solved by technology

Although the loop controller with PID self-tuning function has been commercialized, how to realize the tuning of complex loop PID parameters in DCS is still a technical problem commonly faced in this field

Method used

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  • Cascading gain self-scheduling PID (Proportion Integration Differentiation) controller
  • Cascading gain self-scheduling PID (Proportion Integration Differentiation) controller
  • Cascading gain self-scheduling PID (Proportion Integration Differentiation) controller

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Embodiment Construction

[0023] see figure 1 , figure 1 It is a simplified structural diagram of the cascade gain self-scheduling PID controller of the present invention.

[0024] The cascade gain self-scheduling PID controller includes: a PID gain self-scheduling inner control loop 10, a detection and tuning loop 20 and a PID gain self-scheduling outer control loop 30, and the detection and tuning loop 20 is respectively connected to the PID gain self-scheduling Inner control loop 10 and said PID gain self-scheduling outer control loop 30;

[0025] The PID gain self-scheduling inner control loop 10 includes an inner loop PID gain self-scheduling controller and an inner loop control mode switch 15, and the input end of the inner loop control mode switch 15 is connected to the inner loop PID gain self-scheduling control The output terminal of the device, its control terminal is connected to the output terminal of the detection and setting loop 20;

[0026] The PID gain self-scheduling outer control ...

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Abstract

The invention provides a cascading gain self-scheduling PID (Proportion Integration Differentiation) controller. Through newly arranging a detection setting loop, an inner loop control mode diverter switch and an outer loop control mode diverter switch and by virtue of an appropriate module lap joint, the electrical feedback control of a generalized cascade loop is realized, the critical oscillation information of the process is measured, a controlled system mathematical model is not needed to be established, and the P, I and D parameters of the cascaded inner and outer loops can be automatically set according to requirements during closed-loop control; each PID gain self-scheduling controller of the inner and outer loops automatically regulates the P, I and D parameters according to multiple groups of input P,I and D parameters and actually measured operation condition signals, the transition time of a control system is shortened to the greatest extent, the dynamic deviation and the static deviation are reduced, and the system has better Robust; and through utilizing the controller to control a nonlinear controlled system, the system can obtain ideal dynamic and static control quality in the whole operational working range.

Description

technical field [0001] The invention relates to the technical field of power plant safety control, in particular to a cascade gain self-scheduling PID controller. Background technique [0002] There are many complex production processes in power plants, and most of them adopt generalized cascade control loops. Changes in the operating conditions of the units and fuel supply, such as load changes and coal quality changes, will cause changes in the production control objects. The relatively large change in dynamic characteristics makes the control object show time-varying and nonlinear parameters. Most power plants now use distributed control systems (DCS) for plant-wide control. In DCS, conventional PID (proportional-integral-derivative) controllers are mainly used for closed-loop control. These PID controls are based on the constant or approximate dynamic characteristics of the object. On the basis of constant, when the characteristics of the object change seriously, if the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B11/42
Inventor 李晓枫陈世和
Owner GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
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