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A Dead Zone Compensation Control Method Based on Synovial Film Observer

A synovial observer and dead zone compensation technology, applied in control system, generator control, motor control, etc., can solve problems such as poor compensation effect, suppress zero current clamping phenomenon, improve current waveform, increase low speed Effects of low frequency performance

Active Publication Date: 2019-01-22
XJ POWER CO LTD +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a dead zone compensation control method based on a synovial film observer, to solve the problem that the current off-line compensation method is used to compensate the dead zone and the compensation effect is not good

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  • A Dead Zone Compensation Control Method Based on Synovial Film Observer
  • A Dead Zone Compensation Control Method Based on Synovial Film Observer
  • A Dead Zone Compensation Control Method Based on Synovial Film Observer

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Embodiment Construction

[0023] The specific implementation manner of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0024] An embodiment of a dead zone compensation control method based on a synovial film observer of the present invention:

[0025] Such as figure 1 Shown is a block diagram of a dead zone compensation control system based on a synovial film observer of the present invention. Reference current component in rotating coordinate system and the actual current component i d After comparison, it is converted into a reference voltage component by a PI regulator Reference voltage component and the actual current component i q After comparison, the PI regulator is converted into a rotary reference voltage component and After dq-αβ transformation, it becomes the component and Signal. and The signal is modulated by SVPWM to generate six switching signals T1-T6 to control the inverter. The inverter generates t...

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Abstract

The invention discloses a dead zone compensation control method based on a sliding mode observer. According to the method, based on a permanent magnet synchronous motor, the sliding mode observer is adopted to perform real-time online observation on a reference voltage, an actual current and a stator counter electromotive force under a rotating coordinate system; then the sliding mode observer estimates a disturbance voltage under the rotating coordinate system through an observed value; and finally, the estimated disturbance voltage is fed back to the reference voltage for performing the dead zone compensation. By adoption of the online compensation method, the current harmonic amplitude can be obviously reduced, the total harmonic distortion ratio of the current can be reduced, a zero-current clamping phenomenon can be well restrained, the current waveform can be improved, and the low-speed low-frequency performance of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a dead zone compensation control method based on a synovial film observer. Background technique [0002] Three-phase pulse width modulation (PWM) voltage source inverter (VSI) is widely used in the drive system of permanent magnet synchronous motor. In PWM VSI, in order to avoid the shoot-through phenomenon, a dead zone must be added to the switching signal. Due to the non-ideal characteristics of the switching device (such as dead time, turn-on / off time, voltage drop of the switching device, etc.), there is a voltage distortion between the reference voltage and the output voltage, which is called the dead time effect. Although the dead time is very small relative to the PWM cycle, it causes serious wave and shape distortion, distortion of the motor current and pulsation of the torque. Voltage distortion increases with switching frequency and mainly produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14H02P29/50
CPCH02P21/14
Inventor 李新元于朝辉刘超马骏高鹏曹智慧于浩然陈常曦
Owner XJ POWER CO LTD