AC-DC power grid vulnerable line analysis method and system

Abstract

The invention provides an AC-DC power grid vulnerable line analysis method. The method comprises the steps of acquiring a topological structure of an AC-DC power grid to calculate an original active power flow of each line in the AC-DC power grid, determining and simulating the active power of each line after each line is cut off, calculating an active power flow increment matrix in combination with the original active power of each line, and further acquiring an AC power flow transfer correlation matrix in combination with the safety margin of each line, calculating AC line power flow increment caused by DC locking and influence indexes of AC line on-off on a DC system, and acquiring an AC-DC power flow transfer correlation matrix in combination with the AC power flow transfer correlationmatrix, and converting the AC-DC power flow transfer correlation matrix into a line vulnerability degree vector to obtain a line with the highest vulnerability value as a power grid power failure keyline. By implementing the method, the mutual influence between the AC system and the DC system is considered, and the key line which has an important influence on the cascading failure of the power system can be identified, so that the analysis on the vulnerable line of the AC and DC power grid is realized.

Description

technical field [0001] The invention relates to the technical field of power system line analysis, in particular to a method and system for analyzing vulnerable lines of an AC / DC power grid. Background technique [0002] In recent years, frequent blackouts in European and American countries have aroused widespread concern from the international community. The consequences of blackouts to power systems are catastrophic, seriously affecting the normal operation of society and economy. How to effectively prevent blackouts caused by cascading failures has always been a focus of power systems. [0003] So far, researchers at home and abroad have established a variety of relevant theoretical systems for analyzing and studying the mechanism of power system cascading failures, including the OPA theory with the traditional power system simulation analysis algorithm as the core, the cascading failure process (CASCADE) model, and the power system After the system is abstracted into a ...

AI Technical Summary

Problems solved by technology

However, most of the above theoretical models are based on traditional pure AC power grids. As high-voltage direct current transmission technology is widely used in long-distance power transmission and large power grid interconnection, it has achieved good benefits and increased the complexity of the power grid. The safety and stability of the hybrid system is more prominent

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