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Self-tuning method and system for permanent magnet synchronous motor current loop PI regulator parameter

A permanent magnet synchronous motor and parameter self-tuning technology, which is used in the control of electromechanical brakes, control systems, and generators. Adapt to tuning, solve the mismatch of actual operating conditions, and avoid the effects of complex calculations

Inactive Publication Date: 2020-06-05
SHANDONG ACAD OF SCI INST OF AUTOMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method simplifies the closed-loop transfer function of the current loop, and gives the tuning process of the current loop PI regulator parameters, but does not give a specific method for simplifying the current loop into a first-order system, and the tuned PI regulator parameters will not As the actual running process of the motor changes, the problem of adaptive tuning of PI parameters cannot be solved

Method used

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  • Self-tuning method and system for permanent magnet synchronous motor current loop PI regulator parameter
  • Self-tuning method and system for permanent magnet synchronous motor current loop PI regulator parameter
  • Self-tuning method and system for permanent magnet synchronous motor current loop PI regulator parameter

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Embodiment 1

[0035] This embodiment discloses a permanent magnet synchronous motor current loop PI regulator parameter self-tuning system, see the attached figure 2 As shown, the current control loop is divided into four links: PI regulator, PWM inverter, stator winding, and current feedback, and a complete current loop control structure diagram is established.

[0036] Current oversampling and average value filtering can correspond to the current feedback link in the circuit loop. Through oversampling, 16 current data can be obtained in one PWM switching cycle, and averaging these data can play a role in filtering noise, avoiding Use hardware filters (if hardware filters are used, there will inevitably be a large delay in the current feedback link).

[0037] The online real-time identification of motor inductance and resistance is to use the recursive least square method with forgetting factor to "estimate" the current value of the motor inductance and resistance that changes with the wo...

Embodiment 2

[0048]This embodiment discloses a parameter self-tuning method for the current loop PI regulator of a permanent magnet synchronous motor, see the attached figure 1 As shown, including: SVPWM modulation, update duty ratio, obtain stator phase current average value filtering, perform Clarke transformation and Park transformation, obtain feedback current dq axis components, calculate dq axis current loop error signal, and perform PI adjustment on error signal, Carry out parameter identification based on dq-axis current, q-axis voltage, and current electrical angular velocity, calculate stator resistance and inductance, calculate PI regulator parameters, and judge whether the next half cycle is interrupted.

[0049] For the current loop structure in the general form, the established (the open-loop transfer function here is not the simplest form, but the "general form") current loop open-loop transfer function is:

[0050]

[0051] where k p is the proportional item coefficient...

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Abstract

The invention discloses a self-tuning method and system for permanent magnet synchronous motor current loop PI regulator parameter, and the method comprises the steps: simplifying a current feedback link into unit negative feedback without delay, simplifying a PWM inverter link, and obtaining a simplified current loop structure comprising a PI regulator and a stator winding; establishing a simplified current loop open-loop transfer function based on the simplified current loop structure; performing zero-pole cancellation on the PI regulator transfer function and the stator winding transfer function to obtain a current loop closed-loop transfer function in a first-order inertia link form; and for the condition that the stator resistance and the stator inductance change along with the running state of the motor, identifying the optimally estimated stator resistance and inductance, and adjusting the parameters of the PI regulator in real time. According to the invention, the self-adaptivesetting of the current loop PI regulator parameters is realized, and the problem that the PI regulator parameters are not matched with the actual operation conditions of the motor is solved.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a parameter self-tuning method and system for a current loop PI regulator of a permanent magnet synchronous motor. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] The vector control of a permanent magnet synchronous motor (PMSM) generally adopts a double closed-loop or triple closed-loop cascaded control structure, in which the innermost loop is a current loop, and a PI regulator is generally used to achieve fast current control. In the PI regulator design of the current loop, the proportional term coefficient k p , Integral item coefficient k i If it does not match the motor parameters, the performance of the system will be reduced, and it may also affect the stability of the system. Since the stator and rotor parameters ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/22H02P21/00
CPCH02P21/0017H02P21/22
Inventor 马建辉慕永云宋宁冉周广旭朱孟美高佳
Owner SHANDONG ACAD OF SCI INST OF AUTOMATION
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