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Electric vehicle access grid charger capable of improving charging electric energy quality and method

An electric vehicle and power quality technology, applied in the direction of AC network load balancing, etc., can solve the problems of system operation power factor reduction, DC side output voltage fluctuation, waveform distortion, etc., to reduce current distortion, reduce damage, and prolong service life Effect

Inactive Publication Date: 2016-10-26
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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AI Technical Summary

Problems solved by technology

However, if the voltage or power of the connected new energy fluctuates greatly or has waveform distortion, the power factor of the system will decrease and the output voltage of the DC side will fluctuate.

Method used

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  • Electric vehicle access grid charger capable of improving charging electric energy quality and method
  • Electric vehicle access grid charger capable of improving charging electric energy quality and method
  • Electric vehicle access grid charger capable of improving charging electric energy quality and method

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] Such as figure 1 As shown, a V2G charger that can improve the quality of charging power includes a controllable bridge conversion circuit 1, which can be a single-phase bridge or a three-phase bridge according to different power supply occasions; a zero-crossing comparison phase-locked circuit 2. It is mainly composed of a zero-crossing comparison circuit and a phase-locking circuit. The phase-locking circuit is composed of a phase detector (PD), a low-pass filter, a voltage amplifier and a function generator. The input signal of circuit 2 is the collected power supply The side voltage signal and the voltage acquisition circuit will not be described here; the difference between the output voltage command and the actual output voltage is multiplied by the output signal of circuit 2 after being adjusted by PI, and then subtracted from the collected...

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Abstract

The invention discloses an electric vehicle access grid charger capable of improving charging electric energy quality and a method. Zero crossing detection on access voltage and phase locking on a phase-locked loop are carried out in a control link, a standard sinusoidal instruction signal is formed, a corresponding PWM pulse signal is generated, the amplitude of a signal needed by a pulse signal generation circuit has nothing to do with the waveform amplitude of power voltage, and influences brought by voltage fluctuation at a power supply side or distortion can be avoided. The charger and the method of the invention are applicable to situations in which intermittent new energy sources such as wind energy and tidal energy are integrated to the electric vehicle for charging, influences caused by voltage distortion or amplitude fluctuation of the intermittent new energy sources can be effectively reduced, impact on power electronic devices of the charger is lessened, damages to a rechargeable battery are reduced, and the service life of the charger and the service life of the battery are improved.

Description

technical field [0001] The invention relates to an electric vehicle grid-connected charger and a method for improving the quality of charging electric energy. Background technique [0002] With the popularization of electric vehicles and the increasing peak-to-valley difference of the grid's daily power load, V2G (Vehicle-to-Grid) technology can provide an effective means for the grid's peak-shaving and valley-filling, and has become a current research hotspot. Among them, how new energy is buffered and connected to the grid through electric vehicles is an important field of V2G. However, when intermittent new energy such as wind energy and tidal energy are converted into electric energy, they have great volatility, and large charging fluctuations are generated by the converter. Voltage distortion and current harmonics will not only cause damage to the power electronic devices of the charger, but also reduce the life of the electric vehicle battery. [0003] At present, the...

Claims

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Application Information

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IPC IPC(8): H02J3/32
CPCH02J3/32
Inventor 李付存郭红霞郭亮李昊王鹏代燕杰王者龙张晓东王兆军王振华刘丽君
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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