Hierarchical protection control system facing regional power grid

Abstract

The invention provides a hierarchical protection control system facing a regional power grid. The hierarchical protection control system comprises an in-situ level protection device, a substation area protection control system and a wide area protection control system, wherein the in-situ level protection device is configured according to a traditional protection scheme and adopts a direct sampling direct trip mode or a direct sampling network trip mode; the substation area protection control system is configured according to substations or voltage classes, utilizes an information sharing advantage to improve the backup protection performance, realizes protection functions of backup protection, redundancy protection, failure protection, and the like, and control functions of spare power automatic switching, low-frequency and low-voltage load shedding, and the like, and adopts a network sampling network trip mode; and the wide area protection control system is configured according to areas, realizes functions of wide area backup protection, self-adaptive adjustment of protection fixed values, low-frequency and low-voltage load shedding, power grid state evaluation, safety pre-warning, and the like, and realizes the interaction and the sharing of information of intelligent transformer substations in the areas through a wide area communication net. The hierarchical protection control system has the advantages that the reliability and the selectivity of relay protection can be improved on the basis that protection configuration of the existing power grid is not changed, so high requirements of power grid interconnection, new energy access, and the like on relay protection are satisfied.

Description

technical field [0001] The invention relates to a power system relay protection and stability control system, in particular to a regional power grid-oriented layered protection control system working based on power grid panorama information. Background technique [0002] The traditional power grid protection method is usually configured for a single component, using the protected object's own information to identify faults, and improving the reliability of relay protection through duplication and coordination of protection time of adjacent components, and the correct action rate can reach more than 99.9%. However, with the continuous development of power grid interconnection and the continuous advancement of new energy grid access in recent years, the traditional relay protection method for individual component configuration can no longer meet the current safe and stable operation requirements of the power grid, specifically in the following two aspects: 1. Judging and remov...

AI Technical Summary

Problems solved by technology

However, with the continuous development of power grid interconnection and the continuous advancement of new energy grid access in recent years, the traditional relay protection method for individual component configuration can no longer meet the current safe and stable operation requirements of the power grid, specifically in the following two aspects: 1. Judging and removing faults only rely on the information of the components themselves, regardless of the overall operating status of the power grid. Although the protection operates correctly according to the configuration, it cannot effectively prevent the spread of power grid accidents, such as several major power outages in recent years.

2. With the entry of various new energy into the grid, the operation mode of the power grid is also diversified. The traditional protection method set according to the maximum / minimum operation mode has been difficult to meet the complex and changeable operation requirements of the power grid.

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