Real-time digital simulation model for multi-infeed direct current power transmission system

Abstract

The invention relates to a real-time digital simulation model for a multi-infeed direct current power transmission system. The real-time digital simulation model comprises a plurality of equivalent super-voltage direct current power transmission systems which are connected in parallel, wherein the super-voltage direct current power transmission systems comprise a primary system real-time digital simulation model and a secondary system real-time digital simulation model; the primary system real-time digital simulation model comprises a convertor station and a direct current power transmission circuit, wherein the convertor station is arranged on the two ends of the direct current power transmission circuit; the secondary system real-time digital simulation model comprises a convertor station control system and a protective system, wherein the convertor station control system and the protective system are connected with the convertor system, and are used for controlling and protecting the operation of the convertor station. The operation of the convertor station is controlled and protected by the convertor station control system and the protective system, so that a plurality of direct current simultaneous faults and a plurality of direct current faults which are easily caused by alternating current system fault are avoided, and the impact to the alternating current system in a fault recovery process is avoided.

Description

technical field [0001] The invention relates to an electric power simulation model, in particular to a real-time digital simulation model of a multi-feed direct current transmission system. Background technique [0002] At present, the East China Power Grid presents the obvious characteristics of multi-infeed DC and large receiving-end power grids. However, the area of ​​East China is small, the grid structure is compact, and the electrical distance between multiple DC circuits is relatively short. After the AC system fails, multiple DC circuits are likely to fail at the same time. Multiple DC faults and their recovery process will have a greater impact on the AC system. This interaction between AC and DC poses a huge challenge to the safe operation of the receiving power grid. At the same time, with the UHV AC interconnection among major regional power grids, the receiving end power grid in East China will show new characteristics of AC-DC hybrid transmission, and the scope...

AI Technical Summary

Problems solved by technology

[0002] At present, the East China Power Grid presents the obvious characteristics of multi-infeed DC and large receiving-end power grids. However, the area of ​​East China is small, the grid structure is compact, and the electrical distance between multiple DC circuits is relatively short. After the AC system fails, multiple DC circuits are likely to fail at the same time. Multiple DC faults and their recovery process will have a greater impact on the AC system. This interaction between AC and DC poses a huge challenge to the safe operation of the receiving power grid.

At the same time, with the UHV AC interconnection among major regional power grids, the receiving end power grid in East China will show new characteristics of AC-DC hybrid transmission, and the scope and degree of AC-DC interaction will be further expanded, and this problem will be solved in UHV. In the initial stage of communication and networking, it may be more prominent

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