Distributed power source grid connection capability evaluation method and device

Abstract

The invention provides a distributed power source grid connection capability evaluation method and device. According to the method and device, the equipment parameters, topology structure and operation data of a power distribution network and the initial power of an energy storage device after the power grid connection of a distributed power source are obtained; a plurality of operating scenes aredetermined according to the operation data; the power flow of the power distribution network after the power grid connection of the distributed power source is calculated according to the equipment parameters and topology structure of the power distribution network and the initial power of the energy storage device, and power flow calculation results under the operation scenes are obtained; and the grid connection capability of the distributed power source is evaluated according to the power flow calculation results under the operation scenes. According to the method and device of the invention, the power of the energy storage device is considered, so that distributed power source grid connection capability evaluation with the participation of the energy storage device is realized; the accuracy of an evaluation result is improved; the true acceptance capability of the power distribution network for the distributed power source can be correctly reflected; and the development needs of the energy storage device in power distribution in the future can be satisfied.

Description

Technical field [0001] The invention relates to the field of grid-connection analysis of new energy power generation technology, and in particular to a method and device for evaluating grid-connection capability of distributed power sources. Background technique [0002] At present, with the advancement of low-carbon and green energy strategies and the implementation of the new round of power system reform supporting policies, the application value of energy storage has been recognized by the market, especially the user-side energy storage continues to maintain high growth. According to statistics, the cumulative installed capacity of the energy storage system put into operation on the user side from 2000 to 2016 was 107.9MW (excluding pumped storage and heat storage projects), accounting for 57% of the total installed capacity. From the second half of 2015 to the present, the newly planned amount of energy storage installed capacity is about 740MW, of which the proportion of ins...

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Problems solved by technology

[0003] In order to overcome the deficiencies in the above-mentioned prior art where the evaluation results are biased due to the failure to consider the power of the energy storage device and cannot correctly reflect the real acceptance capacity of the distribution network for distributed power sources, the present invention provides a distributed power grid-connected capability The evaluation method and device first obtain the equipment parameters, topological structure, operation data and initial power of the energy storage device of the distribution network after the distributed power generation is connected to the grid, and then determine multiple operation scenarios according to the operation data, and according to the equipment parameters of the distribution network The parameters, topology and initial power of the energy storage device are used to calculate the power flow of the distribution network after the distributed power generation is connected to the grid, and the power flow calculation results in each operating scenario are obtained; finally, the distributed power generation is calculated according to the power flow calculation results in each operating scenario. The grid-connected capability of the grid is evaluated, considering the power of the energy storage device, which improves the accuracy of the evaluation results, and can correctly reflect the real acceptance capacity of the distribution network for distributed power.

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