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Current fault component-based substation area backup protection method and system

A current sudden change and backup protection technology, which is applied in the direction of emergency protection circuit devices and electrical components, can solve problems such as insufficient sensitivity, tripping, and difficulty in setting and coordination of upper and lower line protection, and achieve the effect of improving protection performance

Inactive Publication Date: 2018-07-31
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] There are many deficiencies in the traditional stepped backup protection, such as: to ensure the selectivity of the protection, sacrifice the quick-break performance, resulting in a long action delay, difficulty in setting and coordination of the upper and lower line protection, and insufficient sensitivity. In addition, it is easy to cause malfunction and cause large Range chain tripping and other accidents

Method used

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  • Current fault component-based substation area backup protection method and system
  • Current fault component-based substation area backup protection method and system
  • Current fault component-based substation area backup protection method and system

Examples

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Embodiment 1

[0055] The present invention provides a station domain backup protection method based on current sudden change, the flow chart of which is as follows Figure 4 shown, including the following steps:

[0056] 1) Determine the boundary conditions of the station domain backup protection;

[0057] In the station domain backup protection scheme based on current mutation, the concept of station domain protection and the realization conditions of station domain protection are firstly described. Station domain protection is proposed under the background of the maturity of intelligent electronic equipment, the establishment of communication network, and the development of technologies such as intelligent substation information collection and processing. According to the processing of information, it can be divided into two types: centralized and distributed. Mode. The centralized method relies on the communication network to collect all levels of equipment information into the main st...

Embodiment 2

[0071] Hereinafter, the present invention will be described more specifically with reference to the accompanying drawings.

[0072] Taking a typical 220kV substation and the connecting lines of adjacent substations as an example, the overall scheme of SPBCV is illustrated, as follows: figure 1 shown. Within the scope of station domain protection, the substation mainly has two 220kV / 110kV / 35kV three-turn transformers, L1~L7 lines are the incoming and outgoing lines of the substation connected to it, G1~G6, Load1~Load4, and CB01~CB25 are equivalent power sources respectively , loads, circuit breakers, and Bus01~Bus06 in the substation belong to 3 different voltage levels, and Bus07~Bus13 are the buses in all adjacent substations.

[0073] First, the entire SPBCV protection area is divided into two types of differential areas according to the different protection ranges: boundary differential area and component differential area. Among them, after the substation model is select...

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Abstract

The invention relates to a current fault component-based substation area backup protection method and system. The method comprises the following steps: 1) a substation area backup protection boundarycondition is determined; 2) differential areas with a boundary differential area and a component differential area covering different protection ranges are determined; and 3) substation area backup protection recognizes a fault position according to defined differential judgment of each differential area, and the original main protection action condition of the component, a power grid topology structure and a breaking state of a circuit breaker are integrated to realize high-performance backup protection for the substation. According to the current fault component-based substation area backupprotection method, various different types of fault in intra-station and inter-station lines can be quickly and reliably recognized, a tripping area can be expanded automatically when the circuit breaker fails to operate, the fault positioning time can be effectively shortened in the current fault component-based search scheme, and the safety of the power grid can be greatly ensured.

Description

technical field [0001] The invention relates to a protection method for an intelligent substation, in particular to a station domain backup protection method and system based on a sudden change in current. Background technique [0002] In recent years, in the tide of power grid construction, large-capacity, long-distance ultra-high voltage networking, direct current transmission, and access to distributed new energy, the traditional protection based on local information will become more and more difficult to adjust and cooperate, and its sensitivity will not be able to Meet the requirements of future power system development. [0003] At present, relay protection usually adopts off-line off-grid and pre-set methods to set protection values, and the verification and verification of protection are only for certain specific operation modes. However, as the structure of the power system becomes increasingly complex, the scale of the power grid continues to expand, and the opera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/22
CPCH02H7/22
Inventor 李仲青李伟郭雅蓉苏舒陈敦辉林湘宁王兴国
Owner CHINA ELECTRIC POWER RES INST
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