Electrical power system key node identification method based on active power load flow betweenness

Abstract

The invention discloses an electrical power system key node identification method based on active power load flow betweenness, and belongs to the field of electrical power system safe reliability protection. According to the method, a computer is utilized, the load flow distribution of an electric power system, power in each transmission path and the active power load flow betweenness of each node are confirmed through a program, and finally a key node is identified. The method can take the directivity of load flow and a system operation mode into account simultaneously and can indirectly reflect the influence of voltage and reactive power on an identification result, an identification process corresponds to the actual operation condition of the electric power system better, and can accurately reflect the function of each node in the active power transmission of an electrical power system, and accordingly the key node of the electric power system can be identified effectively. The method can be widely applied to the identification of the key node of the electric power system, is especially suitable for the identification of the key node of a large and complex electric power system, and provides reliable scientific bases for prevention of the accidents of the electric power system.

Description

technical field [0001] The invention belongs to the technical field of power system safety and reliability protection, and in particular relates to a key node identification method of a power system based on active power flow betweenness. Background technique [0002] With the development of science and technology and the continuous improvement of people's living standards, people have higher and higher requirements for the safe operation of the power system and the reliability of power supply. However, with the increasing scale of the power system, the failure probability of the power system also increases. In recent years, studies on frequent faults in power systems have shown that a fault in a key node in the power system will cause the fault to propagate along the power network at a high speed and trigger a series of chain reactions, which may eventually lead to large-scale power outages or disintegration accidents in the power system. Seriously affect the safe operatio...

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are: ① The electrical betweenness of a node is the sum of the absolute value of the current flowing through the node, which can only reflect the magnitude of the current but not the directionality of the current; The unit current source added between them is not the actual power supply power of the power system; ③Using the current determined by adding the unit current source between the "generator-load" node pairs to identify key nodes cannot reflect the actual operation of the power system well characteristics; ④The influence of voltage level and reactive power is not considered in the process of key node identification

Therefore, the key nodes identified by this method cannot reflect the actual operation of the power system, and cannot effectively protect the safety and reliability of the power system.

Images