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Current feed-forward decoupling method and device for permanent magnet synchronous motor

A permanent magnet synchronous motor, feed-forward decoupling technology, applied in the control of electromechanical transmission, control generator, motor generator control, etc., can solve the problem of motor control performance degradation, to eliminate fluctuations, improve dynamic characteristics and response speed effect

Active Publication Date: 2022-03-29
清华大学苏州汽车研究院(吴江) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of decreased control performance of high-speed motors, the present invention provides a current feed-forward decoupling method for permanent magnet synchronous motors, so that each input can only control a corresponding output, thereby eliminating the failure of the control system caused by external disturbances fluctuations, improving the dynamic characteristics and response speed of the control system

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  • Current feed-forward decoupling method and device for permanent magnet synchronous motor
  • Current feed-forward decoupling method and device for permanent magnet synchronous motor

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Embodiment 1

[0022] see figure 1 with figure 2 , an embodiment of the present invention provides a current feed-forward decoupling method for a permanent magnet synchronous motor. figure 1 A flow chart of the current feed-forward decoupling method for a permanent magnet synchronous motor, figure 2 It is the block diagram of feed-forward decoupling control for permanent magnet synchronous motor.

[0023] The method specifically includes the following steps:

[0024] S110. Calculate the current deviation I of the d-axis dErr and q-axis current deviation I qErr , and put I dErr and I qErr They are respectively used as the input of the d-axis PI controller and the input of the q-axis PI controller.

[0025] The specific calculation formula is: I dErr = I dDes -I d , I qErr = I qDes -I q ;

[0026] Among them, I dDes is the d-axis current target value; I qDes is the target value of the q-axis current.

[0027] S120, according to the current deviation I of the d-axis dErr and...

Embodiment 2

[0040] An embodiment of the present invention provides an application example of a current feed-forward decoupling method for a permanent magnet synchronous motor.

[0041] The following is the program in the current control MCT model m_IsCtl() of a mature motor controller:

[0042] When the motor operation mode is PWMRun, perform the following control steps:

[0043] S210. Calculate the d-axis current deviation IsdErrTust and the q-axis current deviation IsqErrTust as the input of the d-axis current PI controller and the q-axis current PI controller respectively:

[0044] IsdErrTust=(MCT_IsdDes-ISC_Isd) / 2;

[0045] IsqErrTust=(MCT_IsqDes-ISC_Isq) / 2;

[0046] Among them, MCT_IsdDes: d-axis current target value; MCT_IsqDes: q-axis current target value; ISC_Isd: d-axis current; ISC_Isq: q-axis current.

[0047] S220. Calculate the integral step angle: PhiDelta=ic_PhiDelta(dtIsCtl_P[EMC_FrqPWM]*MCT_OmStr).

[0048] Among them, dtIsCtl_P: current loop control period; EMC_FrqPW...

Embodiment 3

[0069] An embodiment of the present invention provides a permanent magnet synchronous motor current feed-forward decoupling device, including:

[0070] PI controller input module for calculating the current deviation I of the d-axis dErr and q-axis current deviation I qErr , and put I dErr and I qErr They are respectively used as the input of the d-axis PI controller and the input of the q-axis PI controller;

[0071] voltage increment calculation module, for the current deviation I according to the d-axis dErr and the q-axis current deviation I qErr Calculate the voltage increment U of the d-axis dAdd and the voltage increment U of the q-axis qAdd ;

[0072] A voltage initial value calculation module, used for the voltage increment U according to the d-axis dAdd and the voltage increment U of the q-axis qAdd Calculate the initial voltage value U of the current step of the d-axis dint and the voltage initial value U of the current step size of the q-axis qint ;

[...

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Abstract

The invention discloses a current feedforward decoupling method and device for a permanent magnet synchronous motor. The method comprises the following steps: calculating the current deviation IdErr of a d axis and the current deviation IqErr of a q axis, and respectively taking the IdErr and the IqErr as the input of a d-axis PI controller and the input of a q-axis PI controller; the voltage increment UdAdd of the d axis and the voltage increment UqAdd of the q axis are calculated; calculating a voltage initial value Udint of a d-axis current step length and a voltage initial value Udint of a q-axis current step length; the voltage control quantity UdUnlim of the d axis and the voltage control quantity UqUnlim of the q axis are determined; and after the voltage control quantity UdUnlim of the d axis and the voltage control quantity UqUnlim of the q axis are subjected to amplitude limiting, the voltage output quantity UdPI of the d axis and the voltage output quantity UqPI of the q axis are output. According to the technical scheme provided by the embodiment of the invention, each input only controls one corresponding output, so that the fluctuation of the control system caused by external disturbance is eliminated, and the dynamic characteristic and the response speed of the control system are improved.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of motor control, and in particular to a current feed-forward decoupling method and device for a permanent magnet synchronous motor. Background technique [0002] In the field of motor control, vector control has been proven to be a high-performance control strategy. The vector control adopts the principle of rotor field oriented control, and decomposes the stator current into excitation current I d and armature current I q , to achieve the effect of independent control of the two components similar to the DC motor. This control method requires the stator current I d , I q and stator voltage U d , U q completely decoupled from each other. But in vector control of AC permanent magnet synchronous motor, I d , I q with U d , U q There is a cross-coupling relationship between them. In order to simplify the control strategy, it is considered that this coupling effect can be ig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P21/22H02P25/022H02P27/12
CPCH02P21/0003H02P21/14H02P21/22H02P27/12H02P25/022
Inventor 江涛赵金东朱江
Owner 清华大学苏州汽车研究院(吴江)