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Inverter nonlinear harmonic compensation method based on two-dimension table look-up and interpolation method

A two-dimensional look-up table and harmonic compensation technology, which is applied to the compensation of inverter nonlinear harmonics, and the field of inverter nonlinear harmonic compensation based on two-dimensional look-up table and interpolation method

Inactive Publication Date: 2017-05-31
ZHEJIANG UNIV
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Problems solved by technology

Since current polarity detection is highly affected by measurement noise, it is always difficult to avoid voltage clamping in various methods of handling zero-crossing detection

Method used

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  • Inverter nonlinear harmonic compensation method based on two-dimension table look-up and interpolation method
  • Inverter nonlinear harmonic compensation method based on two-dimension table look-up and interpolation method
  • Inverter nonlinear harmonic compensation method based on two-dimension table look-up and interpolation method

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Embodiment Construction

[0092] The present invention will be further elaborated below in conjunction with the accompanying drawings and embodiments.

[0093] Strong electric parts such as figure 1 and figure 2 As shown, the three-phase AC power supply is uncontrolled rectified to obtain the DC bus voltage U dc , to supply the voltage source inverter. The inverter is directly connected to the terminals of a permanent magnet synchronous motor (PMSM).

[0094] The weak current part includes busbar voltage sensor and current sensor.

[0095] The motor adopts the permanent magnet synchronous motor commonly used I d = 0 control strategy.

[0096] This compensation method uses the rotating current injected by sweeping frequency and sweeping amplitude before the motor starts to run, and at the same time uses the vector proportional integral controller (VPI) controller in the synchronous d-q coordinate system to suppress the inverter of 6-fold frequency and 12-fold frequency Harmonics of the device cur...

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Abstract

The invention discloses an inverter nonlinear harmonic compensation method based on two-dimension table look-up and an interpolation method. The method comprises the steps of firstly, fixing a motor on a loader so that the motor cannot operate; secondly, injecting a rotatory current with given frequency and amplitude into the motor; thirdly, using a resonance point to conduct inhibition on a vector proportional integral controller with 6-fold frequency and 12-fold frequency of the given frequency in a rotating coordinate system of the current; fourthly, calculating per unit amplitudes of 5, 7, 11, 13 harmonics corresponding to the compensation value of each phase of an inverter and an initial phase value of each harmonic of the compensation value of each phase relative to an orientation angle of current injecting; finally, obtaining a two-dimension look-up table with the amplitude and frequency of the injected current as an input variable and the amplitude of each harmonic and the initial phase value of each harmonic relative to an orientation angle of current injecting as an output. According to the inverter nonlinear harmonic compensation method based on two-dimension table look-up and an interpolation method, the capacity of resisting disturbance of noise measurement in currency detection is higher, and there is no need to cope with the problem of currency zero-crossing detection.

Description

technical field [0001] The invention discloses a method for compensating nonlinear harmonics of an inverter, in particular to a method for compensating nonlinear harmonics of an inverter based on a two-dimensional look-up table and an interpolation method, which belongs to the suppression and compensation of nonlinear harmonics of an inverter field. Background technique [0002] The real inverter needs a certain turn-off and turn-on time when the bridge arm is turned off and on, so the dead time must be artificially set to ensure that the inverter will not be switched off due to the simultaneous conduction of the upper and lower tubes when the state of the bridge arm is switched. Pass and burn. This dead time will introduce an error between the given voltage and the actual output voltage of the inverter, which is directly related to the polarity of the current output by the bridge arm. The dead time, together with the stray characteristics of the IGBT switch itself (such a...

Claims

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Application Information

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IPC IPC(8): H02P29/50G06F17/14H02P21/00
CPCG06F17/147H02P21/0003
Inventor 黄进王彤赵力航侯招文刘赫陈嘉豪
Owner ZHEJIANG UNIV
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