Branch circuit similarity-based wide area backup protection method

A wide-area backup protection and proximity technology, applied in the field of wide-area backup protection based on branch proximity, can solve the problems of accelerating the system crash process, increasing the selectivity, sensitivity and reliability of backup protection, and long-term power failure. , to achieve the effect of a small amount of calculation

Active Publication Date: 2010-12-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

Power system failure is inevitable. If the protection device operates correctly, quickly and reliably, it will effectively curb the deterioration of the system state and play a role in ensuring the safe and reliable operation of the power grid; otherwise, it may accelerate the process of system collapse, resulting in large-scale and long-term power outages
However, the complexity of the power grid structure makes it difficult to set and coordinate

Method used

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  • Branch circuit similarity-based wide area backup protection method
  • Branch circuit similarity-based wide area backup protection method
  • Branch circuit similarity-based wide area backup protection method

Examples

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Embodiment

[0082] image 3 It is a schematic diagram of the New England 10-machine 39-node system. When the system is running normally, the fault definition set is formed according to the network topology and parameters; when the network topology changes and there is a fault again, the fault definition set is quickly updated by using the local inversion method, and then the fault is quickly determined by the closeness of the branch Location. According to different switch displacement events, two cases of "open" and "closed" are studied.

[0083] 1. The branch circuit is closed and the system fails at the same time

[0084] Taking branch 19-23 closed and various types of short-circuit faults occurring in branch 11-12 as an example for analysis (the distance from the fault point to node 11 accounts for 40% of the total length of the line). Assume that branch 19-23 is closed at 0.25s, and at the same time, branch 11-12 also has single-phase grounding, two-phase short circuit, two-phase g...

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Abstract

The method discloses a branch circuit similarity-based wide area backup protection method which belongs to the field of relay protection of electrical power systems. The method comprises the following steps of: under the condition of normal operation of an electrical power system, calculating an equivalent injection current of a fault point by using a failure equivalent model first and then forming a branch circuit correlator matrix according to a network topology parameter and a node injection current and determining a failure definition set; after a network topology is changed, realizing fast update of the failure definition set by modifying part of elements in the branch circuit correlator matrix; and when the electrical power system goes wrong, quickly calculating the minimum value of the similarity between the failure definition set and a branch circuit measured value and determining a failure position according to the minimum value. The method avoids the condition of mismatch or insufficient sensitivity easily occurred in conventional backup protection, and can precisely, sensitively and reliably position the failure under the condition of changing networks.

Description

technical field [0001] The invention belongs to the field of relay protection of electric power systems, in particular to a wide-area backup protection method based on branch closeness. technical background [0002] With the rapid growth of my country's electricity demand and the implementation of the strategy of "power transmission from west to east, mutual supply between north and south, and national networking", my country is forming a weakly connected national interconnected power grid. It is estimated that around 2020, the installed capacity of my country's power grid will increase from 850 million kilowatts in 2009 to 1.6 billion kilowatts, the annual power generation will exceed 7.7 trillion kilowatt-hours, and the west-to-east power transmission capacity will exceed 150 million kilowatts. Six verticals" ultra-large-scale multi-receiving terminal interconnection grid. The complexity of grid structure and the difficulty of operation control are also rare in the world. ...

Claims

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Application Information

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IPC IPC(8): H02J9/04H02H7/28
Inventor 马静李金龙王增平杨奇逊
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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