Calculation method and system for power limit of transmission section considering multiple faults

Abstract

The present invention provides a power limit calculation method and system for a power transmission section considering multiple faults, wherein the calculation method includes the following steps: providing a power transmission section and multiple faults; evaluating each member of the power transmission section when the multiple faults occur The power variation of the line; according to the power variation, the correlation between the multiple faults and the transmission section is judged; when the multiple faults occur, each member line in the transmission section does not exceed the limit as a constraint condition, Calculate the power increase multiple of the power transmission section; calculate the limit power of the power transmission section according to the power increase multiple. The method for calculating the power limit of the power transmission section considering multiple faults provided by the present invention takes into account the influence of multiple faults, and can calculate the power limit of the power transmission section, thereby improving the risk prevention and control capability for multiple faults.

Description

technical field [0001] The invention relates to the technical field of high-voltage power transmission, in particular to a power limit calculation method and system for a power transmission section considering multiple faults. Background technique [0002] The scale of my country's UHV AC-DC interconnected power grid continues to expand, and the operation mode and dynamic behavior of large power grids are becoming increasingly complex. On the one hand, the UHV power grid is developing rapidly, and multiple UHV DC circuits have been put into operation and are in the process. The single-circuit DC rated transmission capacity is 8 million kilowatts, which will be increased to 10 to 12 million kilowatts in the future. UHV DC fault blocking has a huge impact on the power grid. On the other hand, the dense passages and crossovers of transmission lines have increased significantly. There are many crossover points of 220kV and above. The maximum transmission capacity of a single cor...

AI Technical Summary

Problems solved by technology

On the other hand, the dense passages and crossovers of transmission lines have increased significantly. There are many crossover points of 220kV and above. The maximum transmission capacity of a single corridor reaches 26.8 million kilowatts. Multiple faults are prone to occur in extreme weather, natural disasters, and incorrect protection actions. There is a risk of causing a large power grid accident, which seriously endangers the safety of the power grid

[0003] In the power grid dispatching operation, the transmission section determined according to the operation and analysis experience is generally the weak link of the power grid. The existing real-time dispatching technology system lacks online analysis and decision-making technical support for multiple faults in the transmission section, and dispatching operators cannot accurately grasp The risk of multiple faults in the power grid and hidden dangers to safety and stability lack relevant guidance on disposal basis, strategies and measures

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