Abstract
In theory, the cross section is the minimum cut set in the network. For the actual power grid, the transmission cross section is a collection of transmission lines between different regions, which is mainly used for power transmission to achieve the purpose of generating load balance. In this paper, a power grid zoning algorithm is proposed based on the topological structure characteristics and current operation state of the power grid, and the key transmission sections can be directly obtained without depending on the calculation of safety and stability margin. A practical system state partition model and key section sorting method are introduced, and a set of automatic identification method flow of key transmission sections of the system is established by searching for electrical betweenness. The importance of the transmission section is quantitatively evaluated from three angles: the margin from the stability limit, the hub position in the current power flow state, and the impact on the power grid after the power cut-off. The evaluation results can be used as a Reference for decision-making in the planning and reconstruction of the transmission section, safety monitoring, protection configuration, etc.
Highlights
In recent years, several large-scale power outages occurred at home and abroad, which were caused by the failure of a weak link in the interconnected power grid and evolved into a chain failure
Existing researches are based on the preset operation mode of power grid and its corresponding analytical laws, and their research results can not meet the requirements of online operation in scale, speed and decision-making
Interconnected tie lines between different load centers constitute transmission channels [1]. These transmission channels have a decisive influence on the security and stability of the whole power grid, and are the key to keep the whole system running safely and stably
Summary
Several large-scale power outages occurred at home and abroad, which were caused by the failure of a weak link in the interconnected power grid and evolved into a chain failure. It is proposed to construct a grid partition algorithm based on the topological structure characteristics and the current operation state of the power grid, and directly obtain the key transmission sections without depending on the calculation of safety and stability margin.
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