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Electric energy conversion device applied to fast charging of electric vehicle

A technology of electric energy conversion and fast charging, applied in electric vehicle charging technology, electric vehicles, output power conversion devices, etc., can solve the problems of reducing battery life, charging station safety and high technical requirements

Inactive Publication Date: 2019-09-06
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fast charging method will reduce the service life of the battery, and at the same time have higher safety and technical requirements for the charging station

Method used

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  • Electric energy conversion device applied to fast charging of electric vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment one: if figure 1As shown, a power conversion device applied to fast charging of electric vehicles involved in this embodiment includes a-phase cascaded AC-AC converter, b-phase cascaded AC-AC converter, c-phase stage Linked AC-AC converter, a-phase LC filter, b-phase LC filter, c-phase LC filter, a-phase three-winding isolation transformer, b-phase three-winding isolation transformer, c-phase three-winding isolation transformer , the first group of three-phase rectifier bridges, the second group of three-phase rectifier bridges and balance reactors, a-phase cascaded AC-AC converters, b-phase cascaded AC-AC converters and c-phase cascaded AC converters The input terminal of the AC-AC converter is connected to the AC grid; the output of the a-phase cascaded AC-AC converter, the b-phase cascaded AC-AC converter and the c-phase cascaded AC-AC converter The terminals are respectively connected to the a-phase LC filter, b-phase LC filter and c-phase LC filter; the...

Embodiment 2

[0033] Embodiment two: if figure 1 As shown, the working principle of a power conversion device applied to fast charging of electric vehicles involved in this embodiment, a-phase cascaded AC-AC converter, b-phase cascaded AC-AC converter, c-phase cascaded AC-AC converter, c The input terminal of the phase cascaded AC-AC converter is connected to the 10 / 35kV AC grid, and its input voltage frequency f 1 =50Hz; in each group of cascaded AC-AC converters, n single-phase diode rectifier bridges cascaded on the AC side convert 10 / 35kV AC into DC, and each single-phase diode rectifier bridge on the DC side The connected Boost converter outputs a DC voltage with adjustable amplitude according to the requirements of the charging curve, and n H-bridges cascaded on the AC side realize the inverter function, and invert the DC voltage output by the Boost converter into high-frequency AC power. High-frequency alternating current contains high-frequency fundamental wave components and high-...

Embodiment 3

[0034] Embodiment three: as figure 1 As shown, in the control method of a power conversion device applied to fast charging of electric vehicles involved in this embodiment, in each group of cascaded AC-AC converters, the n Boost converters adopt the same control method, The Boost converter outputs DC voltage with adjustable amplitude according to the requirements of the charging curve; according to the different switching tubes used, n H-bridges have two control methods. When using silicon-based MOSFETs or IGBTs, n H-bridges adopt square Wave phase shift control, when using a wide bandgap switch tube (such as silicon carbide-based IGBT or gallium nitride-based MOSFET), n H-bridges are controlled by PWM (including SPWM and SVPWM).

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Abstract

The invention provides an electric energy conversion device applied to fast charging of an electric vehicle, and belongs to the technical field of power electronics. The electric energy conversion device is composed of three groups of cascaded AC-AC converters, three groups of LC filters, three three-winding isolated transformers, two groups of three-phase diode rectifier bridges and a balance reactor. The three groups of cascaded AC-AC converts and the three groups of LC filters convert the three-phase power frequency alternating current into three-phase high frequency alternating current. The input side of the three groups of AC-AC converters uses the mode of cascaded connection of n single-phase diode rectifier bridges to be directly connected with a medium-voltage AC power grid so as to reduce the occupation area and the cost of a charging station. The three three-winding isolated transformers, the two groups of three-phase diode rectifier bridges and the balance reactor form a parallel 12-pulse rectifier so as to output high current and improve the charging speed of the battery.

Description

technical field [0001] The invention relates to an electric energy conversion device applied to fast charging of an electric vehicle, belonging to the technical field of power electronics. Background technique [0002] Electric vehicles can effectively reduce oil consumption and exhaust emissions, and have become a hot research topic in the current automotive industry. Sound and complete charging facilities are the key factors for the popularization of electric vehicles; in large-scale ground charging stations, the power conversion device largely determines the charging speed of electric vehicles, the area occupied by the charging station and the cost. [0003] The charging methods of electric vehicles mainly include conventional charging methods and fast charging methods. When the conventional charging method is used, the power and current of the electric energy conversion device in the charging station are small, and the charging time is long, and the electric vehicle can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217H02M5/458H02M5/10H02M1/12B60L53/20
CPCH02M1/126H02M5/10H02M5/458H02M7/217Y02T10/70Y02T10/7072Y02T10/72Y02T90/14
Inventor 孟凡刚杜青筱高蕾
Owner HARBIN INST OF TECH AT WEIHAI
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