Self-adaptive power distribution network current protection method based on estimated information

A technology for current protection and distribution network, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of non-compliance and high cost, and achieve the effect of reducing impact, improving accuracy, and improving the reliability of protection action.

Active Publication Date: 2014-02-12
STATE GRID CORP OF CHINA +2
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Problems solved by technology

The first method has been widely used in the early stage, but it does not meet the national policy of supporting distributed power generation access to distribution networks; the second method requires large-scale transformation of distribution networks, which is costly and is only used in special cases such as distributed power generation dedicated lines. apply under

Method used

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  • Self-adaptive power distribution network current protection method based on estimated information
  • Self-adaptive power distribution network current protection method based on estimated information
  • Self-adaptive power distribution network current protection method based on estimated information

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Embodiment

[0051] 1. If figure 2 Shown is the composition diagram of the system information flow. The control center obtains a piece of meteorological information in the future time period from the local meteorological unit (the length of the period can be determined according to the forecast accuracy), especially the sunshine intensity information and temperature information, and draws the sunshine curve of the future period of time. . Combined with the distributed photovoltaic power supply installed in the region, the power curve change diagram of each distributed photovoltaic access point in the distribution network can be estimated.

[0052] Assuming that the intensity of the sunshine curve at a certain time is M kw / ㎡, and the photoelectric conversion efficiency is 12%, the power of the photovoltaic power supply of 1㎡ is 12% M kw. The distributed photovoltaic area installed at the access point of a distribution network in this area is S square meters, and the output power is 12% MS...

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Abstract

The invention relates to a protection method in a power distribution network relay protection technology, in particular to a self-adaptive power distribution network current protection method based on estimated information. The method includes the following steps that firstly, power changing curves of connection points of distributed photovoltaic power supplies of a power distribution network are determined; secondly, fault current changing curves of the distributed photovoltaic power supplies are determined; thirdly, a current protection constant value curve of the power distribution network is determined; fourthly, protection constant values of the power distribution network are transmitted to a protection device so that the protection device can act correctly when the power distribution network breaks down. The method can adapt to influence of fault current changes caused by power changes of the distributed photovoltaic power supplies on protection, so that the accuracy of current protection action of the power distribution network is improved, and accordingly the reliability of the protection action is improved.

Description

technical field [0001] The invention relates to a protection method of a distribution network relay protection technology, in particular to an adaptive current protection method of a distribution network based on estimated information. Background technique [0002] For the power distribution system with distributed photovoltaic power (DG), due to the randomness of its power output, it will make it difficult to set the value of the traditional current protection. Existing methods mainly include limiting the access scale of distributed power sources or prohibiting reverse current transmission, and adopting methods such as longitudinal protection based on optical fiber and other communication channels (such as optical fiber longitudinal differential protection). The first method has been widely used in the early stage, but it does not meet the national policy of supporting distributed power generation access to distribution networks; the second method requires large-scale trans...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 李伟杨国生周泽昕王兴国杜丁香李仲青王晓阳
Owner STATE GRID CORP OF CHINA
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