Harmonic interference preventable electric vehicle alternating current charging method

An AC charging, electric vehicle technology, applied in electric vehicles, harmonic reduction devices, battery circuit devices, etc., can solve the problem of not considering the harmonic control of on-board chargers, so as to improve charging efficiency, improve power quality, and ensure economical effect of benefit

Inactive Publication Date: 2015-04-08
SHANGHAI MUNICIPAL ELECTRIC POWER CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of the existing technical level, the current charging pile only has metering and billing functions, communication functions and relatively simple power supply functions, and does not consider effective harmonic control for on-board chargers.

Method used

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  • Harmonic interference preventable electric vehicle alternating current charging method

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with accompanying drawing.

[0014] see figure 1 , the anti-harmonic interference electric vehicle AC charging method of the present invention is charged by an AC charging circuit, and the electric vehicle AC charging method of the present invention comprises the following steps:

[0015] Step S1, connect the AC charging circuit to the AC mains, and start charging the electric vehicle;

[0016] Step S2, sampling the AC mains voltage signal and the AC charging current signal in real time;

[0017] Step S3, according to the AC mains voltage signal and the AC charging current signal sampled in real time, calculate the size of the harmonic and reactive components in the charging current in real time;

[0018] Step S4, outputting harmonics and reactive currents with opposite phases and the same amplitude as those obtained in step S3, so as to offset the harmonics and reactive components in the charging cu...

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Abstract

The invention discloses a harmonic interference preventable electric vehicle alternating current charging method. The method includes the steps of connecting an alternating current charging circuit to alternating current mains for charging an electric vehicle; sampling voltage signals of the alternating current mains and current signals of the alternating current charging in real time; calculating numerical values of harmonic and reactive components of the charging current in real time according to the real-time sampling voltage signals of the alternating current mains and the real-time sampling current signals of the alternating current charging; outputting harmonic current and reactive current which are opposite in phase and identical in amplitude to obtained harmonic current and reactive current to offset the harmonic and the reactive components of the charging current; metering and billing the charging electricity. The harmonic interference preventable electric vehicle alternating current charging method can effectively restrain the harmonic interference on a grid of a vehicle-mounted charger during charging, thereby ensuring the quality and reliability of the power supply of the grid.

Description

technical field [0001] The invention relates to an electric vehicle AC charging method for preventing harmonic interference. Background technique [0002] The energy supply of electric vehicles is indispensable to the industry, and the main energy supply facilities include DC chargers and AC charging piles. The AC charging pile directly provides AC mains power, and the vehicle-mounted charger is used to charge the power battery. Generally, the power is small, the charging time is long, the volume is small, and the land occupation is small. Ordinary low-power on-board chargers generally do not address their own harmonic problems due to weight, volume and cost considerations. As for the power grid, with the widespread use of AC charging piles, a large number of on-board chargers will be harmonic sources that affect the power quality and stability of the power grid. From the perspective of the existing technical level, the current charging pile only has metering and billing f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H02J3/01
CPCH02J3/01H02J3/18H02J7/045Y02E40/40
Inventor 顾临峰王倚东
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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