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Soft switching pulse width modulation method for three-phase three-wire system converter

A pulse width modulation, three-phase three-wire technology, applied in the irreversible conversion of DC power input to AC power output, high-efficiency power electronic conversion, climate sustainability, etc., can solve the problem that the DC voltage utilization rate is only 0.866, the system cost increases , large losses, etc.

Active Publication Date: 2019-10-29
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Traditional three-phase three-wire converter sinusoidal pulse width modulation (SPWM), in one switching cycle, the six main switching tubes of the three-phase soft-switching inverter need to operate six times, the loss is relatively large, and the DC voltage utilization rate Only 0.866, if you want to output a larger voltage, you need to increase the DC side voltage value, which will increase the system cost

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  • Soft switching pulse width modulation method for three-phase three-wire system converter
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  • Soft switching pulse width modulation method for three-phase three-wire system converter

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Embodiment Construction

[0041] 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.

[0042] refer to Figure 1 ~ Figure 3 , the three-phase three-wire converter circuit is constituted as follows:

[0043] DC side part: DC side voltage source V dc ;

[0044] 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...

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Abstract

The invention discloses a soft switching pulse width modulation method for a three-phase three-wire system converter. By adopting the modulation method, the utilization rate of a direct current voltage reaches 1, and the synchronization of the current conversion time of all diodes of the converter to the opposite main switching tube can be ensured when a certain phase of three-phase bridge arms does not act all the time in any switching period, so that the zero-voltage switching-on of all switching tubes can be achieved only by acting the auxiliary switching tube once in one switching period.The modulation method is suitable for the converter to work at any power factor, and the modulation method is more convenient to achieve.

Description

technical field [0001] The invention relates to the field of power electronic converter control, in particular to a soft-switching pulse width modulation (ZVS-PWM) method for a three-phase three-wire converter. Background technique [0002] Traditional three-phase three-wire converter sinusoidal pulse width modulation (SPWM), in one switching cycle, the six main switching tubes of the three-phase soft-switching inverter need to operate six times, the loss is relatively large, and the DC voltage utilization rate Only 0.866, if you want to output a larger voltage, you need to increase the DC side voltage value, which will increase the system cost. Contents of the invention [0003] The object of the present invention is to provide a soft-switching pulse width modulation (ZVS-PWM) method for a three-phase three-wire converter, which has the following characteristics: (1) the DC voltage utilization rate is 1; (2) the switching tube action times are relatively sinusoidal The p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48
CPCH02M7/48Y02B70/10
Inventor 徐德鸿吴宇鹰何宁
Owner ZHEJIANG UNIV