Method and system of charging electric vehicle in an electric vehicle charging station

A method for charging electric vehicle (EV) at an electric vehicle charging station equipped with a plurality of electric vehicle supply equipments (EVSEs), comprising:

• performing charging at least one EV by the EVSEs under control of a cloud controller;
• determining whether a total power consumption corresponding to the EVSEs is equal or larger than X % of a maximum power capacity, X being a real number between 1 and 100;
• when the total power consumption corresponding to the EVSEs is equal or larger than X % of the maximum power capacity, recalculating amount of power for each EVSE by an edge controller and assigning the recalculated amount of power to each EVSE by the edge controller for charging the at least one EV by the EVSEs under control of the edge controller;
• and
• sending charging information of each EVSE to the cloud controller by the edge controller when performing charging the at least one EV by the EVSEs under control of the edge controller;
• wherein when the total power consumption corresponding to the EVSEs is not equal or not larger than X % of the maximum power capacity, it means that there is no power crunch and default charging by cloud controller commences until there is a power crunch;
• wherein when the total power consumption corresponding to the EVSEs is equal or larger than X % of the maximum power capacity, it means that there is a power crunch and dynamic load management is activated;
• wherein in the process of the dynamic load management, charging by the cloud controller is changed to charging by the edge controller, and charging at least one EV by the EVSEs is performed under control of the edge controller;
• wherein the maximum power capacity is a maximum power capacity of a grid infrastructure of a grid;
• wherein the edge controller is configured to read data from a main power meter and the EVSEs, the main power meter is capable of reading grid information of the grid, the cloud controller is implemented by a server and the edge controller is implemented by a computer, the cloud controller has more computational capability than the edge controller.