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Motor current loop PI controller parameter self-tuning method

A technology of parameter self-tuning and motor current, which is used in AC motor control, estimation/correction of motor parameters, general control strategies, etc.

Inactive Publication Date: 2021-03-16
LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The model-based parameter identification method requires the identified parameters to be accurate enough, which is not suitable for occasions where the system parameters change

Method used

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  • Motor current loop PI controller parameter self-tuning method
  • Motor current loop PI controller parameter self-tuning method
  • Motor current loop PI controller parameter self-tuning method

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Embodiment Construction

[0021] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0022] In a specific implementation case, the nominal resistance of the motor is R=2.49Ω, the rated voltage is 24V, the sampling resolution of the driver current is 5mA, and the expected closed-loop bandwidth of the current loop is f=1kHZ.

[0023] Such as figure 1 Shown is the control block diagram of the motor current loop, and the motor current loop uses a PI controller.

[0024] Such as figure 2 Shown, a kind of motor current loop PI controller parameter self-tuning method of the present invention comprises the following steps:

[0025] Step 1, such as image 3 As shown, in the open-loop state, start to apply a voltage command u=h (h>0) to the motor, take the PWM cycle T as the sampling period to collect the motor current i, and then apply different voltage commands according to the current i, when i When >I (I>0), apply the voltage command u=-h, when i ...

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Abstract

The invention relates to a motor current loop PI controller parameter self-tuning method which is used for self-tuning of motor current loop PI controller parameters, and comprises the following steps: in an open-loop mode, applying a voltage instruction to a motor, and sampling the current of the motor by taking the switching period of PWM as a sampling period to obtain a motor current sequence within a period of time; after the obtained current sequence is processed, obtaining the period and amplitude of a dominant frequency component in the current sequence, and obtaining the gain of a current loop PI controller through calculation; and calculating to obtain a proportionality coefficient and an integral coefficient of the PI controller according to a Z-N self-tuning rule. The method issimple and convenient, saves the defects of manual parameter adjustment, and can quickly and accurately complete the setting of the parameters of the PI controller of the motor current loop.

Description

technical field [0001] The invention belongs to the field of motor control and relates to a parameter self-tuning method of a motor current loop PI controller. Background technique [0002] The current loop is the innermost loop in the motor driver, and the performance of the current inner loop determines the performance of the entire motor system. The PI controller is the most commonly used controller for the current loop, and the parameters of the PI controller determine the performance of the current loop. The commonly used PI controller tuning methods in engineering include manual adjustment method and self-tuning method. The manual adjustment method is time-consuming and laborious, and requires workers to have strong engineering experience. Self-tuning methods are divided into model-based parameter identification methods and non-model-based methods. The parameter identification method based on the model needs the identified parameters to be accurate enough, so it is ...

Claims

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Application Information

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IPC IPC(8): H02P23/14H02P23/00
CPCH02P23/14H02P23/0004
Inventor 张田飞王梦柯魏世克
Owner LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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