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Dead-time compensation system and method

A technology of dead zone compensation and three-phase current, applied in the direction of control system, vector control system, control generator, etc., to achieve the effect of avoiding failure and overcoming errors

Active Publication Date: 2013-02-13
SUZHOU INOVANCE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the above schemes, a rotation transformation is required, and the rotation transformation requires an angle θ. At present, most of the schemes focus on how to accurately calculate the current θ based on the detected current, and the filtering method of the D-Q coordinate system, without predicting the current. mentioned

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Embodiment Construction

[0032] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0033] like figure 1 Shown is a schematic diagram of an embodiment of the dead zone compensation system of the present invention. In this embodiment, the dead zone compensation system includes a current sampling unit, an adaptive filter 11 , a forward transform unit, a low pass filter 14 , an inverse transform unit and a dead zone compensation unit 17 . The above-mentioned units can be integrated into the frequency converter, or can be realized by special hardware equipment and software independent of the frequency converter.

[0034] The current sampling unit is used to sample the three-phase cu...

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Abstract

The invention provides a dead-time compensation system which comprises a current sampling unit, an adaptive filter, a forward conversion unit, a low-pass filter, a reverse conversion unit and a dead-time compensation unit, wherein the adaptive filter is used for adaptively filtering each of sampled three phases of current to obtain a three-phase current forecast value; the forward conversion unit is used for executing 3 / 2 conversion and rotary conversion on the three-phase current forecast value; the low-pass filter is used for performing low-pass filtration; the reverse conversion unit is used for performing rotary reverse conversion and 2 / 3 conversion; and the dead time compensation unit is used for performing dead-time compensation according to the current subjected to 2 / 3 conversion. The invention also provides a corresponding dead-time compensation method. According to the invention, the adaptive filter can filter the sampled three phases of current, thereby overcoming an error between a detected value and a real value, which is caused by current detection delay and further avoiding failure of dead-time compensation caused by inaccurate detected current value.

Description

technical field [0001] The invention relates to the field of motor control, more specifically, to a dead zone compensation system and method for a three-phase voltage pulse width modulation frequency converter or a three-phase PWM rectifier power device. Background technique [0002] Voltage pulse width modulation frequency converters are widely used in various motor control occasions. In order to prevent the two power devices on the same bridge arm of the inverter from passing through and destroying the inverter, it is necessary to artificially add dead time to the control signal. Both power devices are cut off within the time zone. In addition, when the inverter is operating, there is a delay in the switching time, and the turn-off time is often delayed, which leads to a difference between the actual obtained voltage value and the theoretical value. These effects are also commonly referred to as dead time. [0003] The existence of the dead zone will have an impact on vol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00
Inventor 唐杰
Owner SUZHOU INOVANCE TECH CO LTD
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