A Differential Adjustable PID Controller Parameter Engineering Tuning Model and Method
A kind of engineering setting and controller technology, which is applied in the direction of electric controllers and controllers with specific characteristics, etc. It can solve the problems that the differential action of the controller cannot be adjusted, and the setting effect is poor.
Active Publication Date: 2019-01-18
SOUTHEAST UNIV
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[0005] Purpose of the invention: In order to overcome the problem that the traditional PID controller parameter engineering tuning method has a poor setting effect and the controller’s differential action cannot be adjusted, the present invention proposes a differential adjustable PID controller parameter engineering tuning model and method, so that the PID controller It has better control performance, and can easily adjust the size of the differential action of the PID controller
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[0026] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:
[0027] Step 1: A single-loop negative feedback control system is composed of a thermal process and a proportional-integral-derivative (PID) controller. The thermal process input is the output u(t) of the PID controller, and the output is y(t). The PID controller’s The input is the difference between the output set value r and y(t) of the thermal process, t is the time, and the transfer function of the thermal process is K is the steady-state gain of the process, T 0 is the time constant, n is the order of the process, s is the complex variable, and the transfer function of the PID controller is K P is the proportional coefficient, K I is the integral coefficient, K D is a differential coefficient, and satisfies: Where α is the differential share of the PID controller;
[0028] Step 2: Set the three parameters K and T of the thermal process tran...
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The invention provides a differential adjustable PID controller parameter project adjusting model and method. According to the method, a genetic algorithm optimization technology is used; an optimized PID controller parameter is used as a sample; a BP neural network technology is used to establish the PID controller parameter project adjusting model; according to the characteristic parameter of an actual thermal process step response curve and the differential share of a selected PID controller, an established neural network model is used to calculate the adjustment value of the PID controller parameter. According to the invention, the PID controller adjusted through the method is superior to a PID controller adjusted through a traditional project adjusting method in the aspects of fastness, stability, robustness and the like; the differential action of the PID controller can be easily adjusted; and deficiencies of a traditional PID controller parameter project adjusting method are effectively overcome.
Description
technical field [0001] The invention belongs to the technical field of thermal automatic control, and in particular relates to a differential adjustable PID controller parameter engineering setting model and method. Background technique [0002] Automatic control of thermal process is a necessary measure and means to ensure the safe and economical operation of thermal equipment. At present, the control strategy widely used in automatic control of thermal process is PID control, and the use of differential action can effectively improve the performance of process control. However, since the differential action is more sensitive to noise, it should not be too large in engineering applications. [0003] At present, the traditional PID controller parameter engineering tuning method mostly adopts the Z-N method proposed by Zielger and Nichols. This method can obtain the initial tuning parameters, but its control performance in terms of rapidity, stability and robustness is not go...
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IPC IPC(8): G05B11/42
CPCG05B11/42
Inventor 雎刚钱晓颖
Owner SOUTHEAST UNIV