Abstract
This paper presents a risk assessment method of flexible distribution district based on fast charging load of largescale electric vehicle. First of all, based on the “parking & charging” mode, considering the different charging needs of residential areas and commercial areas, the simulation of the fast charging load of electric vehicles is carried out; secondly, the traditional way of decentralized access of the fast charging load in the distribution district and the new flexible district scheme are given, and based on this, the control strategy of AC /DC converter and energy storage equipment is proposed, and the district interconnection is established Finally, taking the transformer as the center, the risk indexes including the cost of heavy load, overload and load shedding cost of distribution transformer are put forward, and the risk assessment system of distribution district is established. Taking a demonstration project as an example, this paper discusses and analyzes the safe operation risk of distribution district under different topological structure and fast charging load scale.
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