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Matrix V2G quick charge and discharge method

A charge-discharge, matrix-type technology, applied in collectors, electric vehicles, electrical components, etc., can solve the problems of long charge and discharge time, high power conversion times, and low conversion efficiency, so as to reduce switching loss and improve conversion efficiency Effect

Inactive Publication Date: 2015-09-23
XIAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a matrix V2G fast charge and discharge method, which solves the problems of high power conversion times, low conversion efficiency and long charge and discharge time in the existing V2G converter

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Embodiment Construction

[0050] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0051] The matrix V2G fast charging and discharging method provided by the present invention adopts the AC / DC matrix converter topology, and the AC / DC matrix converter topology is as follows: figure 1 As shown, its 6 groups of bidirectional switches Spa, Spb, Spc and Sna, Snb, Snc use common emitter IGBTs, L f and C f Inductance and capacitance of input filter, L and C are inductance and capacitance of output filter, u sa , u sb , u sc is the grid side voltage, V a , V b , V c Input voltage for matrix converter, i dc is the rectifier side DC current, u dc is the DC voltage on the rectifier side.

[0052] The switch combinations according to the AC / DC matrix converter topology must satisfy V a , V b , V c The constraint condition of no short circuit, so the 9 switching states of the AC / DC matrix converter and the corresponding inpu...

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Abstract

The present invention discloses a matrix V2G quick charge and discharge method. The method adopts an AC / DC matrix converter topology structure, and six bidirectional switches of the structure adopt common-emitter IGBTs. The method comprises four steps of carrying out sector partition and calculating sector angles and effective current duty ratios, setting conducting time for the corresponding bidirectional switch in each sector, performing quick charge by means of voltage-current double closed-loop space vector control, and performing constant-current discharge by means of current loop negative feedback control. The matrix V2G quick charge and discharge method according to the present invention solves the problems of high frequency of electric energy converting, low converting efficiency and long time for charging and discharging of the existing V2G converter. The matrix V2G quick charge and discharge method realizes quick charge and discharge of the storage battery for the electric automobile by means of pulse charging / constant-current discharging the storage battery based on an AC / DC matrix converter, the power factor is 1, and the harmonic distortion of grid-side current is decreased to below 5% by using the double zero vector switch sequences, so that the switching loss is effectively reduced, and the conversion efficiency is increased.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a matrix V2G fast charging and discharging method. Background technique [0002] How to find a large energy storage device to store the electric energy during the low power consumption of the grid is a huge problem facing the power system; the high cost of electric vehicles also makes it difficult to promote electric vehicles, and electric vehicles are idle most of the time. In order to solve the high cost of electric vehicles and the energy storage problem of the grid, the scheme of using battery energy storage of electric vehicles has been widely concerned, that is, to realize the two-way interaction and exchange between the energy of electric vehicles and the grid under control (Vehicle to Grid). , referred to as V2G), this solution better solves the problem of high cost compensation for grid energy storage and automobiles, and can cut peaks and fill vall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/10H02J3/32
Inventor 李生民韩钊王季龙陆梦云
Owner XIAN UNIV OF TECH
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