Photovoltaic energy storage electric automobile charging station system and method for switching state of energy storage system

Abstract

The invention discloses a photovoltaic energy storage electric automobile charging station system and a method for switching working state of an energy storage system. The photovoltaic energy storage electric automobile charging station system comprises a photovoltaic system, an energy storage system, a charging system, a DC(direct current) / AC (alternating current) inverter, an AC / DC rectifier and a DC / DC converter, wherein the photovoltaic system is connected to an alternating current power distribution network by virtue of the DC / AC inverter and is connected to the energy storage system by virtue of the DC / DC converter; the energy storage system is connected to the alternating current power distribution network by virtue of the DC / AC inverter and is connected to the charging system by virtue of the DC / DC converter; and the charging system is connected to the alternating current power distribution network by virtue of the AC / DC rectifier. The method provided by the invention has the advantages that uniform scheduling on the photovoltaic system and the energy storage system in the electric automobile charging station is realized, utilization rate of the charging station to solar energy in an area is improved, and impact to a power grid by centralized charging can be effectively buffered, thus power supply stability is guaranteed, grid discharging can be realized, peak shaving of the power grid can be participated, power quality is improved, and obvious economic benefit is achieved.

Description

technical field [0001] The invention relates to the field of electric vehicle charging station system and its control technology, in particular to an electric vehicle charging station system using photovoltaic and energy storage technology and a method for switching working states of the energy storage system. Background technique [0002] Electric vehicles will absorb power from the grid during the charging process. When a considerable number of electric vehicles are charged at the same time, there will be an active power impact on the AC distribution network connected to them, which will affect the power quality, so it needs to be smoothed. At present, there is no effective suppression measure for this power shock. [0003] In order to realize the full use of solar energy in the region, there are electric vehicle charging stations equipped with photovoltaic systems in China. In previous charging stations, after the photovoltaic array converts solar energy into electrical ...

AI Technical Summary

Problems solved by technology

That is to say, the energy storage system only appears as an auxiliary device of the photovoltaic system, and the utilization of solar energy in the area is not sufficient, and its effect on the AC distribution network is also very limited.

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