Three-phase four-wire system zero voltage switching back-to-back converter circuit and modulation method thereof

A technology of back-to-back converters and zero-voltage switching, applied in the field of converters, can solve the problems of reducing circuit efficiency, large filters, and large switching losses of converter devices.

Active Publication Date: 2018-08-17
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The circuit works in a hard switching state, there is a diode reverse recovery phenomenon, and the switching loss of the converter device is large, which limits the improvement of the operating frequency, resulting in the need to use a larger filter and reducing the circuit efficiency

Method used

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  • Three-phase four-wire system zero voltage switching back-to-back converter circuit and modulation method thereof
  • Three-phase four-wire system zero voltage switching back-to-back converter circuit and modulation method thereof
  • Three-phase four-wire system zero voltage switching back-to-back converter circuit and modulation method thereof

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Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] refer to figure 1 , the three-phase four-wire zero-voltage switching back-to-back converter circuit includes the three-phase filter capacitor C on the inverter AC side 1 、C 2 and C 3 , three-phase filter inductor L ao , L bo , L co , three-phase load R 1 , R 2 and R 3 , DC side series capacitor group C dcp and C dcn , the three-phase filter inductor L on the rectifier side ai , L bi , L ci , containing a parallel diode D r7 Auxiliary switch S 7 , Resonant inductance L r , clamp capacitor C c The auxiliary resonant branch and six groups of bridge arms are formed; each group of bridge arms is composed of two series-connected full-controlled switches containing anti-parallel diodes, wherein: the upper and lower switches of the first bridge arm and their anti-parallel diodes are respectively S i1 , S i4 and D i1 、D i4 , the upper and lower swi...

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Abstract

The invention discloses a three-phase four-wire system zero voltage switching back-to-back converter circuit and a modulation method thereof. The circuit comprises converter circuit inverter side loads, filter capacitors, filter inductors, rectifier side filter inductors, six sets of bridge arms formed by two full control main switches equipped with anti-parallel diodes, a resonance branch formedby an auxiliary switch including the anti-parallel diode and connecting between the DC bus capacitor and the six sets of bridge arms, a clamping capacitor and a resonance inductor, and resonance capacitors connected in parallel on the two ends of the main switch and the auxiliary switch. The pulse signals of the auxiliary switch and the main switch are synchronized so that zero voltage switching of all the switches can be realized in each switching period, the reverse recovery current of the main switch anti-parallel diodes can be effectively suppressed, the switching loss is low, the circuitefficiency is high, the switching frequency can be enhanced and the system power density can be enhanced.

Description

technical field [0001] The invention relates to the technical field of converters, in particular to a three-phase four-wire zero-voltage switch back-to-back converter circuit and a modulation method thereof. Background technique [0002] The traditional two-level three-phase four-wire back-to-back PWM converter includes twelve fully-controlled main switches (S i1 ~S i6 and S o1 ~S o6 ) composed of a three-phase bridge arm, three input filter inductors (L ai , L bi , L ci ), connect two DC bus capacitors (C dcp , C dcn ), connect three output filter inductors between the output midpoint of the output bridge arm and the load (L ao , L bo , L co ), the neutral points of the positive and negative bus capacitors, the neutral point of the power grid, and the neutral point of the load are connected together. The circuit works in a hard switching state, there is a diode reverse recovery phenomenon, and the switching loss of the converter device is large, which limits the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/44H02M5/458H02M1/36
CPCH02M1/36H02M1/44H02M5/4585Y02B70/10
Inventor 徐德鸿施科研邓金溢赵安陈四雄苏先进易龙强
Owner ZHEJIANG UNIV
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