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Method to reduce grid harmonics during charging and discharging of electric vehicles

A charging and discharging process, electric vehicle technology, applied in the field of electric power, can solve problems such as power harmonic pollution and power quality deterioration

Inactive Publication Date: 2016-06-01
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As the impact of the environmental crisis and energy crisis becomes more and more significant, electric vehicles, as a representative of a new generation of energy-saving and environmental protection tools, have entered a climax of development. Wave pollution, leading to deteriorating power quality

Method used

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  • Method to reduce grid harmonics during charging and discharging of electric vehicles
  • Method to reduce grid harmonics during charging and discharging of electric vehicles
  • Method to reduce grid harmonics during charging and discharging of electric vehicles

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Embodiment Construction

[0041] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0042] A method for reducing grid harmonics during charging and discharging of electric vehicles, comprising the steps of:

[0043] (1), the AC power grid is first filtered by an AC inductance, and then an inductance and a nonlinear load are connected in series;

[0044] (2), the passive filter and the active filter are connected in parallel with the series branch composed of inductance and nonlinear load through the coupling transformer in series; the passive filter, the active filter and the coupling transformer are combined to form a hybrid filter;

[0045](3), hybrid filter is connected with interharmonic detection filtering device, described interharmonic detection filtering device is made of DSP chip, microprocessor and band stop filter, those skilled in the art can refer to DSP chip and different The microprocessor data sheet of the m...

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Abstract

The invention belongs to the field of power, and relates to an electric automobile charging station, in particular to a method for reducing power harmonics produced in the electric automobile charging and discharging process. Due to the fact that both an active filter and a passive filter (C-shaped filter) have advantages and disadvantages, a mixed filter formed by combining the active filter with the C-shaped filter is connected to a power grid side, a double-stage inter-harmonic detection method is adopted, existing harmonics are filtered away through the FFT method, and finally the harmonics added to the power grid side are reduced to the greatest degree.

Description

technical field [0001] The invention belongs to the field of electric power, and relates to an electric vehicle charging station, in particular to a method for reducing grid harmonics in the charging and discharging process of an electric vehicle. Background technique [0002] As the impact of the environmental crisis and energy crisis becomes more and more significant, electric vehicles, as a representative of a new generation of energy-saving and environmental protection tools, have entered a climax of development. Wave pollution leads to deteriorating power quality. [0003] After the electric vehicle charging station is connected to the grid, a lot of harmonics will be added to the grid. In the three-phase balanced system, the 5th and 7th harmonics are especially obvious. When the charger is connected to the power grid, it must pass through a transformer. The connection method is as follows: figure 1 shown. [0004] Multiple chargers in the electric vehicle charging s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02J7/00
CPCY02E40/40
Inventor 赵菊敏王方媛李灯熬
Owner TAIYUAN UNIV OF TECH