Method for identifying weak nodes of power grid based on vector digraph
An identification method and weak node technology, applied in the field of weak node identification of power grid based on vector directed graph, can solve the problems of considering the relative performance of nodes, no mutual relationship, and considering node performance by comprehensive attributes
Active Publication Date: 2013-10-09
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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However, these methods have a common problem, that is, the performance of nodes in the system is only considered according to the individual attributes of nodes, and the performance of nodes in the system is not considered based on the comprehensive attributes of nodes, let alone the interaction between nodes. The relationship perspective considers the relative performance of nodes
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[0035] figure 1 is a flow chart of the method for identifying weak nodes in the power grid based on vector directed graphs, such as figure 1 As shown, the method for identifying weak nodes in a power grid based on a vector directed graph provided by the present invention includes:
[0036] Step 1: Determine the first-level characteristic attributes of the load nodes and the second-level characteristic attributes corresponding to each first-level characteristic attribute.
[0037] In this embodiment, the first-level characteristic attribute of the load node is the measured pressure flow r of the load node 1 , the power r of the load node 2 and the reactive power compensation r of the load node 3 . The second-level characteristic attributes corresponding to the measured voltage and current of the load node include the measured voltage r of the load node 11 and the measured current r at the load node 12 . The second-level characteristic attributes corresponding to the powe...
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The invention discloses a method for identifying weak nodes of a power grid based on a vector digraph in the technical field of voltage stability control of power systems. The method comprises the following steps of: determining first-level characteristic attributes of load nodes and second-level characteristic attributes respectively corresponding to the first-level characteristic attributes; acquiring values of the characteristic attributes of the load nodes; extracting main characteristic attributes of the load nodes; calculating weights of the main characteristic attributes of the load nodes; generating the vector digraphs of the load nodes according to the weight of the main characteristic attribute of each load node; calculating vector quantized values of the load nodes according to the vector digraphs of the load nodes; and determining the weak nodes of the power grid according to the vector quantized values of the load nodes. According to the method, the comprehensive attributes of the load nodes are considered, the mutual relation among the load nodes is established through the vector digraphs, and the weak nodes of the power grid are further determined, so that the efficient support is provided for the voltage stability control.
Description
technical field [0001] The invention belongs to the technical field of power system voltage stability control, and in particular relates to a method for identifying weak nodes of a power grid based on a vector directed graph. Background technique [0002] With the continuous expansion of the scale of power system interconnection, the demand for power has increased sharply, and the characteristics of inter-regional and long-distance power transmission systems have become increasingly prominent. In recent years, there have been many voltage collapse accidents at home and abroad, causing significant economic losses. Through the analysis of these power system accidents, it is found that the voltage instability of the power grid often starts from one or several nodes with relatively weak voltage stability, and then Spread to other nodes, eventually leading to the collapse of the entire system voltage. In a power system, different load nodes have different influences on voltage s...
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Inventor 刘琳李国栋罗晗宋自立仇珏宋志新李小龙黄琳华
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)