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Power distribution network bearing capacity assessment method and device

A technology for evaluating devices and distribution networks, which is applied in the field of distribution networks, can solve problems such as the stability of distribution network oscillations, achieve the effects of optimizing layout and orderly access, improving stability, and avoiding oscillations

Pending Publication Date: 2021-06-29
CHINA ELECTRIC POWER RES INST +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the problems of vibration and poor stability of the distribution network in the prior art, the present invention provides a method for evaluating the carrying capacity of the distribution network, including:

Method used

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  • Power distribution network bearing capacity assessment method and device
  • Power distribution network bearing capacity assessment method and device
  • Power distribution network bearing capacity assessment method and device

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Experimental program
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Effect test

Embodiment 1

[0068] The short-circuit ratio is generally used to evaluate the relative strength and stability between AC and DC systems. Embodiment 1 of the present invention provides a distribution network carrying capacity evaluation method based on the short-circuit ratio of distributed new energy sources. The specific flow chart is as follows figure 1 As shown, the specific process is as follows:

[0069] S101: Calculate the short-circuit ratio of the distributed new energy grid-connected point based on the active output of the distributed new energy grid-connected point connected to the distribution network;

[0070] S102: Determine the capacity limit of the distributed new energy grid-connected point based on the short-circuit ratio of the distributed new energy grid-connected point;

[0071] S103: Evaluate the carrying capacity of the distribution network based on the capacity limit of the distributed new energy grid-connected point.

[0072] The equivalent circuit diagram of the d...

Embodiment 2

[0100] Based on the same inventive concept, Embodiment 2 of the present invention also provides an evaluation device for distribution network carrying capacity, such as image 3 shown, including:

[0101] The calculation module is used to calculate the short-circuit ratio of the distributed new energy grid-connected point based on the active output of the distributed new energy grid-connected point connected to the distribution network;

[0102] The determination module is used to determine the capacity limit of the distributed new energy grid-connected point based on the short-circuit ratio of the distributed new energy grid-connected point;

[0103] The evaluation module is used to evaluate the carrying capacity of the distribution network based on the capacity limit of the distributed new energy grid-connected point.

[0104] Computing modules include:

[0105] The first calculation unit is used to consider the interactive influence between distributed new energy sources ...

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Abstract

The invention provides a power distribution network bearing capacity assessment method and device, and the method comprises the steps: calculating the short-circuit ratio of a distributed new energy grid-connected point based on the active power output of the distributed new energy grid-connected point connected to a power distribution network, determining the capacity limit of the distributed new energy grid-connected point based on the short-circuit ratio of the distributed new energy grid-connected point, and finally, evaluating the bearing capacity of the power distribution network based on the capacity limit of the distributed new energy grid-connected point. The method considers the difference of the distributed new energy grid-connected points and the influence of the difference on the overall bearing capacity of the power distribution network, achieves the evaluation of the bearing capacity of the power distribution network based on the short-circuit ratio of the distributed new energy grid-connected points, avoids the oscillation problem of the power distribution network, improves the stability of the power distribution network, facilitates the new building and extension of new energy in the power distribution network, and a basis can be provided for optimized layout and ordered access of distributed new energy.

Description

technical field [0001] The invention relates to the technical field of distribution network, in particular to a method and device for evaluating the carrying capacity of a distribution network. Background technique [0002] Distributed new energy is developed and utilized near the load side, which has the advantages of cleanliness and high efficiency, and is rich in new energy resources such as wind and light. Therefore, vigorously developing distributed new energy is conducive to building a "clean, low-carbon, efficient and safe" energy system , in line with the strategic requirements of energy development, has broad prospects. However, a large number of distributed new energy sources are connected to the distribution network, which puts forward higher requirements for the power balance, power quality and stability of the distribution network, and brings new challenges to the planning and design of the distribution network. Therefore, it is necessary to evaluate the abilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q50/06
CPCG06Q10/0637G06Q10/0639G06Q50/06
Inventor 董昱丁杰董存梁志峰范高锋赵欣陈水耀陈文进夏俊荣张俊王会超彭琰
Owner CHINA ELECTRIC POWER RES INST