Electric vehicle charging, storage and discharging integrated charging station and charging and discharging method

Abstract

The invention discloses an electric automobile charging station integrating charging, storing and discharging. The electric automobile charging station comprises an AC / DC converter, a two-way DC / DC converter, an energy storage pile and a one-way DC / DC converter, wherein the alternating-current side of the AC / DC converter is connected with a power grid, so that alternating currents from the power grid are converted into direct currents, and the direct currents are transmitted to a bus; one end of the two-way DC / DC converter is connected with the bus, the other end of the two-way DC / DC converter is connected with the energy storage pile, and two-way energy transmission between the energy storage pile and the bus is achieved; the one-way DC / DC converter provides a power supply for the electric automobile and transmits the direct currents on the bus to the electric automobile; the energy storage pile is used for storing electric energy, and automatic charging and discharging are achieved through the two-way DC / DC converter. On the basis of guaranteeing normal charging of the electric automobile, a connection mode between a charging system and an energy storage system and a charging and discharging mode of the energy storage pile are improved, a charging peak value load curve and a smooth charging load curve of the charging station can be effectively reduced, shallow-charging and shallow-discharging conducted on an energy storage battery are achieved, power distribution capacity of the charging station is reduced and the cycle life of a power battery is prolonged.

Description

technical field [0001] The invention relates to the field of power supply from a battery pack to a load, in particular to an electric vehicle charge-storage-discharge integrated power station and a charge-discharge method. Background technique [0002] At present, the promotion and application of electric vehicles in China mostly stays in the public domain, such as passenger cars, taxis, sanitation vehicles and other official vehicles. The grid load further increases. At the same time, when the charging capacity of the electric vehicle power battery reaches below 80%, it will be decommissioned from the electric vehicle, but this part of the battery can be used as energy storage. [0003] Therefore, in order to reduce the impact of electric vehicle charging on the grid load and realize the cascaded utilization of power batteries, energy storage stacks with a certain capacity have been built in various places to realize the integration of charging, discharging and storage at ...

AI Technical Summary

Problems solved by technology

However, the problem with this charging and discharging method is that the capacity of the energy storage system is required to be large enough to directly interact with the power grid for peak shaving and valley filling, otherwise the effect will not be obvious

However, the problem with this device is that it increases the construction cost of a charging station with only one type of battery, and the applicability is poor.

At the same time, it does not solve the problem of load impact on the power grid when the charging station is charging

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