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Direct-current power supply system applicable to pure electric bus charging stations and charging station thereof

A technology of power supply system and charging station, which is applied to electric vehicles, battery circuit devices, and AC networks to reduce harmonics/ripples, etc. It can solve problems such as increased loss, increased vibration and noise, and increased heat generation to reduce current The effect of total harmonic distortion, good harmonic suppression, and high power factor

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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the filter structure has some limitations
First of all, the active filter pretends to be on the grid side, and the harmonics and reactive power all flow through the grid side and valve side windings of the transformer, and the strong harmonic flux passes through the iron core of the transformer, which makes the insulation of the transformer more difficult and generates heat. increase, the vibration and noise become larger, and the loss increases, which affects the operating efficiency and stability of the system
Secondly, active filter investment cost is high

Method used

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  • Direct-current power supply system applicable to pure electric bus charging stations and charging station thereof
  • Direct-current power supply system applicable to pure electric bus charging stations and charging station thereof
  • Direct-current power supply system applicable to pure electric bus charging stations and charging station thereof

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Embodiment Construction

[0016] The specific implementation manner of the present invention will be described below in conjunction with the accompanying drawings.

[0017] figure 1 , figure 2 It is a DC power supply system suitable for pure electric bus charging stations. The DC charging system of this embodiment includes an auto-coupling harmonic shielding transformer 3, a set of static var generators 2, a filter 4 and two sets of The three-phase thyristor rectifier bridge 5; the network side winding 7 is connected to the AC power grid 1 in a star connection; the extension winding 11 of the upper bridge, the extension winding 12 of the lower bridge and the common winding are all connected to the rectifier bridge 5 after phase-shifting with the extension delta connection; The rectified DC constitutes the DC bus voltage, which supplies power to the DC charging system 6 of the pure electric bus charging station. The upper bridge common winding 9 and the lower bridge common winding 10 are connected in...

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Abstract

The invention discloses a direct-current power supply system applicable to pure electric bus charging stations and a charging station thereof. The direct-current power supply system comprises a three-phase power grid which is connected with a primary winding of a harmonic shielding transformer. A secondary winding of the harmonic shielding transformer is connected with a rectifier module and a filter. A static var generator is connected in parallel between the three-phase power grid and the primary winding of the harmonic shielding transformer. Pure electric bus charging station filtering and reactive power compensation are realized, the harmonic content of the pure electric bus charging station is reduced, and the power factor of the pure electric bus charging station is improved.

Description

technical field [0001] The invention relates to the field of power supply and distribution, in particular to a novel DC power supply system suitable for pure electric bus charging stations and the charging stations thereof, so as to realize filtering and reactive power compensation for the charging stations. Background technique [0002] The pure electric bus charging station adopts a high-power high-frequency charger. The three-phase current input is rectified by the three-phase uncontrollable rectifier bridge inside the charger. After filtering, it provides DC input for the high-frequency DC-DC power circuit. The output of the power conversion circuit is passed After the output is filtered, it charges the power battery of the pure electric bus. The high-power and high-frequency chargers of pure electric buses are typical nonlinear loads and contain a large number of power electronic devices. The inherent nonlinear characteristics of power electronic devices will inevitably...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/02H02J3/01H02J3/18
CPCY02E40/30Y02E40/40
Inventor 李勇袁志远罗隆福辛建波曹一家
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