PI (Proportional Integral) parameter mixed setting method

A parameter, AC speed regulation technology, applied in the field of PID control, can solve the problems of large calculation amount and required storage space, difficult to promote and apply, etc., to improve adaptability, improve dynamic performance and steady-state accuracy, improve steady-state accuracy and The effect of speed pulsation

Active Publication Date: 2012-04-25
WISDRI WUHAN AUTOMATION
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Problems solved by technology

The optimization method works better in general, but the amount of calculation and the storage space required are large, so it is difficult to popularize and apply

Method used

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  • PI (Proportional Integral) parameter mixed setting method
  • PI (Proportional Integral) parameter mixed setting method
  • PI (Proportional Integral) parameter mixed setting method

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Embodiment 1

[0064] Embodiment 1: Application of PID parameter hybrid tuning method in closed-loop vector control system

[0065] 1. Closed-loop vector control system and tuning method:

[0066] The mathematical model of the asynchronous motor is a high-order, nonlinear, strongly coupled multivariable system, and the high-performance control of the asynchronous motor can be realized by using vector control.

[0067] The closed-loop vector control system adopted in the present invention is as figure 2 As shown, it includes fuzzy PI controller, speed loop PI controller, flux loop PI controller, torque loop PI controller, compensation module (torque loop and flux loop compensation), modulation ratio and angle calculator, SPWM wave generating module, current flux linkage position converter, converter (CLARK change and PARK conversion), sensor (encoder and current sensor) and asynchronous motor, where: the encoder is used to measure the real-time speed of the asynchronous motor, and the curre...

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Abstract

The invention relates to a PI (Proportional Integral) parameter mixed setting method, which is a model-based mixed setting method combining off-line setting and fuzzy PI on-line setting for ensuring that a closed loop vector control system works in an optimal state. The PI parameter mixed setting method comprises the following steps of: firstly deducing a mathematic model of a system according toa vector control principle, calculating rotational inertia by a method of constant torque start and machine free stop, and calculating PI parameters and inner ring compensation dosage according to the mathematic model; proposing a new PI control rule table by a fuzzy PI controller; and finally verifying the exactness of the PI parameters by a comparison test. According to the PI parameter mixed setting method disclosed by the invention, the dynamic property and the steady state precision of the system are improved and are better than those of a system utilizing a single setting method, and the validity of the method is verified.

Description

technical field [0001] The invention relates to the technical field of PID control, in particular to a PI parameter hybrid tuning method. Background technique [0002] PID control is by far the most general control algorithm. From 1915 to 1940, the PID controller experienced a process from production to popularization, which promoted the great progress of the industry. Although a large number of experts and scholars have proposed many advanced control methods since 1940, the PID controller is still widely used because of its simple structure, small amount of calculation, easy implementation, and strong robustness. In various industrial process control such as metallurgy, chemical industry, electric power and machinery. [0003] At present, in the process control of the world, pure PID regulators account for 84%, and if the improved version is included, the proportion exceeds 90% (see documents 1 and 2. Document 1 "Summary of Advanced PID Parameter Tuning Methods" , Wang W...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B11/42
Inventor 李鹏徐晖王胜勇康现伟卢家斌李传涛李四川李海东
Owner WISDRI WUHAN AUTOMATION
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