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Improved complex vector PI controller employing current harmonic suppression system and method of permanent magnet synchronous motor

A technology for permanent magnet synchronous motors and current harmonics, applied in vector control systems, electromechanical brakes, control systems, etc., can solve problems such as poor suppression of current harmonics, achieve suppression of current harmonics, improve control performance, increase Effect of Controller Bandwidth

Active Publication Date: 2018-12-11
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies in the prior art, the present invention improves the complex vector PI control, and is used in the permanent magnet synchronous motor system to suppress the current harmonics, the purpose is to solve the problem of the traditional complex vector PI controller on the current harmonics when the speed changes and fluctuates. Suppress the problem of poor effect and improve the control performance of permanent magnet synchronous motor system

Method used

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  • Improved complex vector PI controller employing current harmonic suppression system and method of permanent magnet synchronous motor
  • Improved complex vector PI controller employing current harmonic suppression system and method of permanent magnet synchronous motor
  • Improved complex vector PI controller employing current harmonic suppression system and method of permanent magnet synchronous motor

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Embodiment 1

[0051] A permanent magnet synchronous motor current harmonic suppression system using an improved complex vector PI controller, such as figure 1 As shown, the permanent magnet synchronous motor current harmonic suppression system includes a permanent magnet synchronous motor vector control system and several improved complex vector PI controllers; the permanent magnet synchronous motor vector control system includes a speed controller 1, a q-axis current Controller 2, d-axis current controller 3, Park inverse transform 4, space vector PWM 5, three-phase inverter 6, permanent magnet synchronous motor 7, Clarke transform 8, Park transform 9, position sensor 10, and position and speed calculation unit 11; the several improved complex vector PI controllers are connected in parallel on the q-axis current controller 2 and the d-axis current controller 3, the system is a double closed-loop structure of speed and current, the outer loop is a speed loop, and the inner loop It is the dq a...

Embodiment 2

[0081] A method for suppressing current harmonics of a permanent magnet synchronous motor using an improved complex vector PI controller, the method comprising:

[0082] Step 1: connecting the improved complex vector PI controller in parallel with the q-axis current PI controller and the d-axis current PI controller;

[0083] Step 2: The q-axis current deviation Δi q and d-axis current deviation Δi d Input it into the improved complex vector PI controller, and obtain the q-axis and d-axis voltage output through the improved complex vector PI controller

[0084] Step 3: the q-axis and d-axis voltage output of the improved complex vector PI controller output Respectively with the voltage output by the q-axis current PI controller and the d-axis current PI controller superimposed to obtain new q-axis and d-axis voltage commands

[0085] Step 4: Pass the q-axis and d-axis voltage commands Controls the AC components in the q-axis and d-axis currents to suppress current ...

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Abstract

The invention provides an improved complex vector PI controller employing current harmonic suppression system and method of a permanent magnet synchronous motor , belonging to the technical field of motor control. A system and method for suppress current harmonics of a permanent magnet synchronous motor improve a complex vector PI controller and a q-axis current PI controller, A d-axis current PIcontrol is connected in parallel, so that that output of the improve complex vector pi controller is separate from the output of the pi controller, A new q-axis and d-axis voltage command is obtainedto control the ac component of q-axis and d-axis currents and to suppress current harmonics.

Description

technical field [0001] The invention relates to a current harmonic suppression system and method of a permanent magnet synchronous motor using an improved complex vector PI controller, and belongs to the technical field of motor control. Background technique [0002] Permanent magnet synchronous motors have the characteristics of high power density, high efficiency, and high reliability, and have been widely used in various power applications such as electric drives, electric vehicles, CNC machine tools, and aerospace. However, due to factors such as the nonlinearity of the inverter and the non-sinusoidal waveform of the motor's back EMF, the winding current contains low-frequency subharmonics such as the 5th, 7th, 11th, and 13th orders, which cause the torque fluctuation and loss of the motor to increase, and the control performance of the system worse. Therefore, current harmonics can be suppressed from two aspects of motor optimization design and control algorithm improv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/22H02P25/026
CPCH02P21/22H02P25/03H02P2205/01H02P2205/07
Inventor 安群涛刘兴亚李帅安琦张建秋谢成龙
Owner HARBIN INST OF TECH
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