Centralized energy storage charging pile

Abstract

The invention discloses a centralized energy storage charging pile. The charging pile comprises two-way or unidirectional DC / DC conversion device with a high-frequency isolation transformation function and a direct-current bus. A first connecting point of the DC / DC device is connected to one or more energy storage devices through an energy storage bus, and a second connecting point is connected tothe direct-current bus. The charging pile also comprises first and second two-way or unidirectional AC / DC conversion devices with a high-frequency isolation transformation function. Electric energy of the energy storage device can be concentrated in the energy storage bus, and the electric energy of the energy storage device, electric energy of an alternating-current power grid and electric energy of a battery in an electric vehicle are combined, so that the electric energy can freely flow among the energy storage bus, the alternating-current power grid and the battery, and impact of chargingof the electric vehicle on the alternating-current power grid is reduced. Meanwhile, the battery in the vehicle can be effectively utilized and used for energy storage to feed the power grid or charge the energy storage device reversely, the electric energy of the energy storage device can also be used for charging the electric vehicle or feeding the power grid, and an integrated solution is formed.

Description

technical field [0001] The invention relates to the field of charging piles, in particular to a centralized energy storage charging pile. Background technique [0002] Generally, electric vehicles draw power from the AC power grid, but due to the limitation of the power supply of the AC power grid, especially the limited capacity of a single box transformer, it is impossible to connect to a charging pile that exceeds its capacity. At the same time, there may be some differences in the electricity cost of the AC power grid in different time periods, and the charging of electric vehicles is a random electricity consumption, so there are cases where the peak electricity cost is used, or the full power cannot be charged. If the energy storage device stores the electric energy when the electricity bill is low or the grid is idle, and releases the electric energy when the electricity consumption is overloaded when the electricity bill is high or the electricity consumption peaks, ...

AI Technical Summary

Problems solved by technology

[0002] Generally, electric vehicles get power from the AC grid, but due to the limitation of the AC grid in terms of power supply, especially the limited capacity of a single box transformer, it is impossible to connect charging piles exceeding its capacity

At the same time, there may be some differences in the electricity cost of the AC grid in different time periods, and the charging of electric vehicles is a random electricity consumption, so there are cases where peak electricity charges are used or full power cannot be charged.

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