A charging pile system that can improve charging quality

Abstract

The invention discloses a charging pile system capable of improving charge quality. Through a charging pile, under the condition of no capacity increase of the existing power distribution network, high-power fast charge of an electromobile can be realized by utilizing an energy storing device, buffer between the power distribution network and the charging pile can be realized, short time interference and impact to the power distribution network can be reduced, in addition, the charging pile system can compensate the voltage and current outputted from the power distribution network to the charging pile system, the three-phase voltage of the power distribution network can be compensated by utilizing a correction signal, the three-phase current of the power distribution network can be compensated by utilizing the changed current, the correction signal and harmonic voltage are equal in size and opposite in direction, the changed current and harmonic current are equal in size and opposite in direction, thereby effectively eliminating the harmonic in the voltage and current outputted by the power distribution network, and obviously improving the quality of the electric energy outputted by the power distribution network.

Description

Technical field [0001] The invention relates to a charging pile system capable of improving charging quality. Background technique [0002] With the deepening of the global energy crisis, the depletion of oil resources and the increasing harm of air pollution and global temperature rise, energy saving and emission reduction are the main directions of future automotive technology development. Japan's Toyota Corporation took the lead in developing the Prius hybrid car, which opened the prelude to the era of electric vehicles. As a new generation of transportation, electric vehicles have incomparable advantages over traditional vehicles in terms of energy saving, emission reduction and reducing human dependence on traditional fossil energy. Since 2009, the Chinese government has intensively introduced policies and measures to encourage the development of electric vehicles and related industries, and enterprises have significantly increased their investment in electric vehicle ...

AI Technical Summary

Problems solved by technology

At present, it is difficult for existing chargers to realize the function of high-power fast charging for electric vehicles without increasing the capacity of the existing power grid.

[0004] Because the existing charger lacks a buffer device between the grid and the electric vehicle charger, when the charger quickly charges the electric vehicle with high power, the charging equipment will cause short-term interference and impact on the grid

[0005] Since the charging piles and the loads used in the charging piles are non-linear devices, they will have a bad impact on the power quality of the power grid during operation, and the harmonic pollution in the power grid is becoming more and more serious.

In addition, the voltage asymmetry and voltage drop caused by the failure of the power grid, together with the harmonics, seriously deteriorate the power quality index and reduce the reliability of the power supply of the power grid.

For those charging piles with high requirements on power quality, quality problems such as voltage drop and harmonics will reduce the charging quality and even lead to interruption of the production process, resulting in huge economic losses

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