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Current type PWM rectifier multi-stage overlap time control method based on voltage partitioning

A technology of voltage partitioning and time control, applied in the direction of high-efficiency power electronic conversion, conversion of AC power input to DC power output, electrical components, etc. The effect of grid-side current waveform, accelerating switching speed and reducing switching loss

Active Publication Date: 2016-09-21
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

But this stacking time compensation method is based on the assumption that I a and I b Under the condition that the rise time and fall time are very short, while in actual operation when the line voltage U ab When the value is small, such as Image 6 As shown, the current switching speed will be slower, the compensation method will fail, and the grid side current distortion cannot be avoided

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  • Current type PWM rectifier multi-stage overlap time control method based on voltage partitioning
  • Current type PWM rectifier multi-stage overlap time control method based on voltage partitioning
  • Current type PWM rectifier multi-stage overlap time control method based on voltage partitioning

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[0040] The present invention provides a current mode PWM rectifier multi-stage overlapping time control method based on voltage partitioning. In order to make the object, technical scheme and effect of the present invention clearer and clearer, the present invention is further described in detail with reference to the accompanying drawings. It should be understood that the specific implementations described here are only used to explain the present invention, not to limit the present invention.

[0041]The current-mode PWM rectifier provided by the present invention is based on the multi-stage stacking time control method of voltage division, such as figure 1 , Figure 7 , Figure 8 As shown, real-time sampling of the grid side line voltage, according to the comparison of the grid side line voltage and three set values, including positive reference value, zero value and negative reference value, where,

[0042] The first setting value is the positive reference value, which i...

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Abstract

The present invention discloses a current type PWM rectifier multi-stage overlap time control method based on voltage partitioning. The control method is based on a current type PWM rectifier, firstly three setting values are set and network side wire voltage is collected in real time, through comparing a network side wire voltage value and a set value, the network side wire voltage is divided into four voltage areas, and finally a corresponding overlap time is set for each of the voltage areas. Compared with an existing overlap time control method, the method of the invention has the advantages that the distortion of the grid side current can be reduced, the commutation speed is accelerated, and the commutation loss is reduced.

Description

technical field [0001] The invention proposes a voltage partition-based multi-stage overlapping time control method for a current-type PWM rectifier, which belongs to the technical field of power electronic control. Background technique [0002] Converter technology has been widely used in various fields of the national economy, many of which require a rectification link to obtain a DC voltage, because the conventional rectification link widely uses a diode uncontrolled DC circuit or a thyristor phase-controlled rectification circuit, so the A large amount of harmonics and reactive power have been injected into the power grid, resulting in serious "pollution" of the power grid. The most fundamental measure to control this grid "pollution" is to require the converter device to realize sinusoidal grid-side current and operate at unity power factor. The PWM rectification technology is introduced into the control of the rectifier, which makes the grid-side current of the rectif...

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Application Information

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IPC IPC(8): H02M7/219H02M1/12
CPCH02M1/12H02M7/219H02M1/0054Y02B70/10
Inventor 刘清秦海鸿张鑫付大丰徐华娟
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS