A method for determining the protection priority of each component in a wide area protection communication system

Abstract

The invention discloses a method for determining a protection priority of each component in a wide-area protection communication system. The method comprises: for the importance and reliability of each component in the wide-area protection communication system and incorrect action situations of corresponding protection, performing protection priority division on each component of a local layer with a weight distribution and threshold setting method to determine the protection priority of each component. According to the method for determining the protection priority of each component in the wide-area protection communication system, provided by the invention, the superior performance of wide-area protection is exerted more perfectly, a very good solution is proposed for the problem that information congestion possibly occurs when the wide-area protection communication system has a fault, and the wide-area protection is facilitated to make a more accurate and quicker judgment for taking measures in time to ensure the system to run safely and stably.

Description

technical field [0001] The invention relates to the field of wide-area protection communication, in particular to a method for determining the protection priority of each component in a wide-area protection communication system. Background technique [0002] Faced with the increasingly complex power grid structure, traditional protection has exposed problems such as difficulty in protection setting, insufficient sensitivity, and difficulty in coordination between protections. Wide-area backup protection based on multi-point information for fault component identification and tripping decision-making has attracted widespread attention. In the existing wide-area protection, the central protection has a longer distance and a wider range than the on-site protection. From the point of view of information theory, the more and more detailed information is obtained, and the more fault-tolerant the system is, the stronger the system's fault tolerance will be by utilizing the redundancy...

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Problems solved by technology

However, this will also bring some problems: the existing wide area protection communication system substation access communication network bandwidth is limited, usually n × 2Mbit / s (generally n = 1 ~ 8), compared to the 100Mbit / s station Ethernet The communication bandwidth of the network is much smaller, and the collection of massive data at a certain decision point will make the central decision-making unit likely to encounter the "curse of dimensionality" problem, causing the communication network to be paralyzed. At the same time, the communication delay caused by excessive communication load With packet loss, it will be unavailable for some wide-area protection with high delay requirements

There is a proposal to divide the communication services of all components in the substation on the ground floor into five categories according to attributes and upload them according to priority. However, this method divides the sampling values ​​or phasor values ​​of the entire network into the same priority, which cannot alleviate the corresponding information flow. stress on communications networks

A new wide-area backup protection algorithm based on fault voltage comparison has also been proposed, which uses the measured values ​​of voltage and current fault components on one side of the line to calculate the voltage fault component on the other side, and reduces the amount of wide-area information transmission through fault area detection. This method does not give full play to the advantages of wide-area network-wide information

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