Method and system for detecting harmonic current of synchronous motor
A technology of harmonic current and synchronous motor, which is applied in the direction of motor generator test, only current measurement, and current/voltage measurement, etc., can solve the problems of reducing control performance, slowing down the response speed of harmonic current, and output containing ripple, etc. Achieve the effect of fast response speed, high extraction accuracy and suppression of interference
Active Publication Date: 2021-02-02
TONGJI UNIV +1
View PDF6 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] However, in the prior art, in permanent magnet synchronous motors used in electric vehicles and some high-power applications where the fundamental current is much larger than the harmonics, the detection performance is degraded due to the interference of the fundamental wave, and the output contains ripples, which affects the control of the harmonic current. Effect
Reducing the cut-off frequency of the low-pass filter or introducing an additional pre-filter can suppress DC interference, but it will slow down the response speed of harmonic current detection and also reduce the control performance
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0045] Such as figure 1 As shown, a synchronous motor harmonic current detection method, the method includes the following steps:
[0046] (1) Extract the total stator current harmonics based on the control error between the stator fundamental current reference and feedback in the d, q coordinate system;
[0047] (2) Extract the harmonics to be detected from the total stator current harmonics by using multi-synchronous coordinate transformation and low-pass filtering.
[0048] Such as figure 2 As shown, step (1) is specifically:
[0049] (11) Obtain the stator fundamental wave current reference value and the corresponding fundamental wave current feedback value in the d, q coordinate system;
[0050] (12) Estimate the actual fundamental current response of the stator in the d, q coordinate system according to the stator fundamental wave current reference value in the d, q coordinate system and the system current closed-loop transfer function;
[0051] (13) Make a differen...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The present invention relates to a synchronous motor harmonic current detection method and system, the method comprising the following steps: (1) extracting the total stator current harmonic based on the control error between the stator fundamental wave current reference and feedback in the d, q coordinate system; 2) Using multi-synchronous coordinate transformation and low-pass filtering to extract the harmonics to be detected from the total stator current harmonics. Compared with the prior art, firstly, the present invention extracts the total stator current harmonics, and then uses multi-synchronous coordinate transformation to extract the harmonics to be detected from the total stator current harmonics, which can suppress the harmonics of the high-amplitude fundamental wave components Secondly, according to the fundamental wave current sampling feedback value and reference value, the present invention uses the fundamental wave current control error to extract the total stator current harmonic. This method has high harmonic current extraction accuracy, fast response speed, and easy implementation.
Description
technical field [0001] The invention relates to the technical field of synchronous motor control, in particular to a method and system for detecting a harmonic current of a synchronous motor. Background technique [0002] Permanent magnet synchronous motors have been widely used as drive motors in electric vehicles and other fields due to their high efficiency and high power density. However, due to the back electromotive force harmonics caused by the dead zone effect of the inverter and the cogging effect and saturation effect of the motor, the stator generates a harmonic current that is twice the fundamental frequency. If not controlled, harmonic currents will generate additional losses and torque ripple, affecting motor efficiency and torque output smoothness. [0003] The traditional permanent magnet synchronous motor adopts vector control, and uses PI to control the stator current in the dq rotating coordinate system. Due to the limitation of the bandwidth of the PI c...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00G01R31/34
CPCG01R19/0092G01R31/343G01R19/0053G01R31/346
Inventor 康劲松母思远姜付杰张志强类延宵
Owner TONGJI UNIV