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Direct current speed control mothed based on fuzzy PID control

A technology of DC speed regulation and fuzzy controller, applied in control systems, control generators, vector control systems, etc., can solve the problem that the controlled objects are difficult to meet the ideal requirements, the characteristics of the controlled objects are difficult to grasp, and the characteristics of the controlled objects are difficult to grasp. It is difficult to further improve the control accuracy of the controlled object, so as to achieve the ideal control effect, suppress nonlinearity, and stabilize the control state.

Inactive Publication Date: 2017-02-22
HUNAN UNIV OF TECH
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Problems solved by technology

Although the current modeling ideas and techniques have made great progress, due to the difficulty of grasping the characteristics of many controlled objects, we simplify or approximate the mathematical model of the controlled object when building the model, so the controlled object It is difficult for the object to meet the idealized requirements in actual operation
Therefore, in the traditional PID control system, it is difficult for us to further improve the control accuracy of the controlled object

Method used

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  • Direct current speed control mothed based on fuzzy PID control
  • Direct current speed control mothed based on fuzzy PID control

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Embodiment Construction

[0019] The present invention will be described in detail below in conjunction with specific embodiments. It should be noted that the technical features or combinations of technical features described in the following embodiments should not be regarded as isolated, and they can be combined with each other to achieve better technical effects.

[0020] Such as figure 1 As shown, a kind of DC speed regulation method based on fuzzy PID control provided by the present invention is as follows:

[0021] First calculate the actual speed n of the motor and the given speed n ref The deviation e and the deviation change rate ec, and then fuzzify them, the fuzzy e and ec are deduced by the fuzzy control rules, and k is obtained after defuzzification p * 、k i * and k d * . During the control process, the parameters of the conventional PID controller are modified online in real time, and finally the speed of the brushless DC motor is adjusted by the conventional PID controller.

[0...

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Abstract

The invention provides a direct current speed control mothed based on fuzzy PID control, comprises the following steps: first, an actual rotation rate of the motor n and a rotation rate deviation e of a preset speed nref and a change rate of deviation ec are figured out, and then are fuzzified; after fuzzy, e and ec are controlled by fuzzy control rules reasoning, kp, ki and kd are acquired through fuzzification resolution. In the control process, a conventional PID controller parameter is modified online real-timely and finally rotation rate of the brushless direct current motor is adjusted by the traditional PID controller. The fuzzy control of the invention does not need to rely on the precise mathematical model of a controlled object so the invention is more stable in the control, and the non-linearity of the controlled object can be effectively suppressed; In the control process, the changes and real-time feedback of the parameter can be continuously monitored by the fuzzy PID self-tuning to idealize the control effect.

Description

technical field [0001] The invention belongs to the technical field of DC motor speed regulation, and in particular relates to a DC speed regulation method based on fuzzy PID control. Background technique [0002] DC motors are mainly used in mining machinery, mine coilers, rolling mills and other mechanical power equipment. However, the DC motor is in a non-linear operating state during the speed regulation process, and the traditional PID control cannot be used to regulate the speed of the DC motor well. [0003] Traditional PID control is based on the mathematical model of the controlled object, and the effect of traditional PID control is based on the accuracy of the mathematical model. Although the current modeling ideas and techniques have made great progress, due to the difficulty of grasping the characteristics of many controlled objects, we simplify or approximate the mathematical model of the controlled object when building the model, so the controlled object It ...

Claims

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Application Information

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IPC IPC(8): H02P21/00
CPCH02P21/001
Inventor 于惠钧吴刚柳云山
Owner HUNAN UNIV OF TECH
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