A non-unity power factor output space vector modulation method for three-phase soft-switching converters

A technology with unit power factor and output space, applied in the direction of converting AC power input to DC power output, output power conversion device, climate sustainability, etc., can solve problems such as failure and loss of soft switching characteristics of converters, and achieve Effects of reducing electromagnetic interference, high circuit efficiency, and low switching loss

Active Publication Date: 2020-09-15
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional modulation method is only suitable for the converter output power factor angle of -30°~+30°. When the converter output power factor angle exceeds the above range, the soft switching characteristics of the converter will be invalidated, and the loss of All switches are characterized by zero voltage turn-on

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  • A non-unity power factor output space vector modulation method for three-phase soft-switching converters
  • A non-unity power factor output space vector modulation method for three-phase soft-switching converters
  • A non-unity power factor output space vector modulation method for three-phase soft-switching converters

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Embodiment Construction

[0027] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention. The present invention will be described in detail below in conjunction with the accompanying drawings.

[0028] refer to figure 1 , the three-phase soft-switching converter circuit constitutes as follows:

[0029] Auxiliary resonant branch part: a parallel diode D aux The auxiliary switch tube S aux , Resonant inductance L r , clamp capacitor C c The auxiliary resonant branch formed by the auxiliary switching tube S aux with clamp capacitor C c After series connection and resonant inductance ...

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Abstract

The invention discloses a non-unity power factor output space vector modulation method of a three-phase soft-switching converter. In each space vector sector, through the vector modulation method of the present invention, it can be ensured that in any switching cycle, all the diodes of the converter commutate to the main switching tube on the opposite side synchronously, so that the auxiliary switching tube can Only one action is needed to realize zero-voltage turn-on of all switching tubes. The invention solves the modulation problem of the three-phase soft-switching converter under the output of non-unity power factor, the number of switching actions is small, all the switching tubes are turned on at zero voltage, the circuit conversion efficiency is high, and it is beneficial to expand the three-phase soft-switching converter The scope of application of the device.

Description

technical field [0001] The invention relates to the control field of power electronic converters, in particular to a non-unity power factor output space vector modulation method of a three-phase soft-switching converter. Background technique [0002] The traditional three-phase soft-switching converter space vector modulation method, in a specific space vector sector, through the vector arrangement, keeps the phase with the largest current among the three phases inactive within one switching cycle, and at the same time can control the The existing switching action of commutating current from the diode to the main switching tube is aligned synchronously, and the auxiliary switching tube only needs to act once in a switching cycle to realize zero-voltage turn-on of all switching tubes. The traditional modulation method is only applicable to the converter output power factor angle of -30°~+30°. When the converter output power factor angle exceeds the above range, the soft switc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02M1/42H02M1/44
CPCH02M1/4233H02M7/5387H02M1/0051H02M1/0058Y02B70/10
Inventor 徐德鸿吴宇鹰何宁
Owner ZHEJIANG UNIV
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