Distributed optimization method of charging power of electric automobiles in aggregator

Abstract

The invention relates to a distributed optimization method of charging behaviors of a plurality of electric automobiles in an aggregator and belongs to the technical field of electric power system operation and control. According to the method, a controller of a parking lot or a cell side is used as a coordinator for optimal computation and used for providing coordinating information for sub-controllers on the automobiles, and the sub-controllers optimize charging power curves of the sub-controllers according to the coordinating information and feed the information back to the coordinator. Iterative computations are performed according to the following steps that firstly, the sub-controllers of the automobiles initialize an initial curve which meets charging requirements of the sub-controllers, and the step is used as a starting step of iteration; and after each iteration, the coordinator can obtain improved charging power of the electric automobiles, and the charging power of the electric automobiles is obtained after iteration convergence and sent to the sub-controllers. By means of a charging scheme of the method, best approximation of ideal curves can be achieved. The method is applicable to physical distribution characteristics of the automobiles and simultaneously has high calculation efficiencies.

Description

technical field [0001] The invention belongs to the technical field of power system operation and control, in particular to a method for distributed optimization of charging power of multiple electric vehicles in a cluster. Background technique [0002] Studies have shown that electric vehicles are parked most of the day. In Vehicle-to-Grid technology, a large number of electric vehicles parked in parking lots or residential areas are regarded as an aggregator, which will be managed uniformly to provide services to the grid. For example, a general control device is installed in the parking lot to control the charging power of each electric vehicle during the parking period, so that it can charge in a way that is beneficial to the grid as much as possible while meeting its own charging needs, such as peak shaving and valley filling (in Residential load peaks reduce charging power, and increase charging power during low load periods); at the same time, the charging control de...

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Problems solved by technology

But due to the large number of cars, the centralized scheme will encounter computational difficulties

Secondly, some researchers, such as M.D.Galus, S.Koch and G.Andersson published some heuristic schemes in the paper "Provision of Load Frequency Control by PHEVs, Controllable Loads, and a Cogeneration Unit" published in IEEE Trans.Industrial Electronics , but these schemes cannot fully achieve the best tracking effect on the ideal curve due to the loose mathematical principles

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