Operation method of charging pile with energy storage device

Abstract

The present invention discloses an operation method of a charging pile with an energy storage device. According to the operation method, the energy storage device is utilized to realize the high-power fast charging of an electric vehicle under a condition that the capacity of an existing power distribution network is not increased, buffering between the power distribution network and the charging pile is realized, short-term interference and impact on the power distribution network can be decreased; the problem of large harmonic content of the network side of the charging pile of the electric vehicle can be solved; and fundamental wave reactive current, negative-sequence current, zero-sequence current and harmonic current in load current can be filtered out, so that only a fundamental wave positive-sequence active component is left, and therefore, the influences of zero-sequence leakage error can be avoided, and the efficiency and security of charging can be greatly improved.

Description

Technical field [0001] The invention relates to a method for operating a charging pile with an energy storage device. 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 ...

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Problems solved by technology

Among them, the harm caused by harmonic pollution to the power grid mainly includes the following aspects: the voltage and heat caused by harmonic current will shorten the service life of power factor compensation capacitors; due to mechanical vibration, it will be affected by the fundamental frequency magnetic field and harmonic current Influence, when the mechanical resonance frequency is equal to the electrical excitation frequency, resonance will occur to generate greater mechanical stress and damage the equipment; harmonics will cause the system to misjudge the point where the voltage crosses zero and the voltage is zero; harmonic currents will cause The increase of transformer iron loss and copper loss; interference to electronic equipment and relay protection; harmonic current will cause equipment malfunction, which may interrupt production and operation

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