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Dead-zone compensation method and compensation system for frequency converter

A technology of dead zone compensation and compensation method, which is applied in the direction of converting AC power input into AC power output, output power conversion devices, electrical components, etc., can solve problems such as current zero-crossing distortion, detection deviation, etc., and reduce output voltage distortion. , Inhibit the zero current clamping phenomenon, improve the effect of dead zone compensation accuracy

Active Publication Date: 2016-05-11
SHANGHAI GIE EM
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Problems solved by technology

However, when there is nonlinear distortion on the edge of the output voltage, this detection method itself has a detection deviation, which mainly occurs in the small range of the output current, so that in the hardware compensation mode, there is still serious distortion near the zero-crossing point of the current

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  • Dead-zone compensation method and compensation system for frequency converter
  • Dead-zone compensation method and compensation system for frequency converter
  • Dead-zone compensation method and compensation system for frequency converter

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Embodiment Construction

[0049] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0050] Based on the hardware dead zone compensation method, this solution corrects the hardware pulse width detection error by software, thereby greatly improving the output voltage distortion problem under low current conditions.

[0051] According to this principle, the inverter dead zone compensation method provided by this scheme mainly includes the following steps, as follows: image 3 Shown:

[0052] Detect the actual duty cycle of the PWM output voltage, calculate the error between the command duty cycle and the actual duty cycle, and use it as the hardware detection dead time Tdt_h;

[0053] Detect the instantaneous value of the output current, and within the set smaller current threshold range, according to the magnitude and sign of th...

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Abstract

The invention discloses a dead-zone compensation method and compensation system for a frequency converter, and relates to the technical field of motor control. According to the scheme, on the basis of a hardware dead-zone compensation method, software correction is carried out on a hardware pulse width detection error, so that the problem of output voltage distortion under a low-current condition is greatly improved; an output voltage error caused by dead time can be detected at extremely high accuracy; dead-zone compensation can be accurately carried out; the output voltage distortion is greatly reduced; and output current harmonic distortion is suppressed.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a frequency converter dead zone compensation technology. Background technique [0002] The output terminal of the voltage source inverter generally adopts a bridge circuit with two power semiconductor switches with upper and lower complementary actions for each phase, and the output voltage adopts PWM mode. duty cycle to regulate the output voltage. [0003] In order to prevent the "bridge arm through" phenomenon between the upper and lower power semiconductors, a period of "dead time" is generally inserted into the drive signal of the bridge arm. During this period, the upper and lower power semiconductors The switching devices are all in a reliable off state. [0004] The insertion of the dead time leads to the "dead time effect". At the output voltage level, the main manifestations are: output voltage pulse width deviation and pulse edge nonlinearity. [0005] The upper and low...

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Application Information

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IPC IPC(8): H02M5/458
CPCH02M5/458
Inventor 刘春龙黄洪剑
Owner SHANGHAI GIE EM
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