Grid structure optimization method for realizing reliable splitting based on node relevancy

Abstract

The invention discloses a grid structure optimization method for realizing reliable splitting based on node relevancy. According to the method, aiming at the problem that a splitting strategy is not converged due to the fact that a grouping mode is not remarkable and a splitting range is widely distributed in the current splitting process, the association degree between system nodes is changed byadopting a method of adjusting the number of lines, so that the purpose of reducing a splitting decision space is achieved. According to the invention, generalized characteristic analysis is carried out based on a slow homology theory, and a dominant mode is acquired to construct a modal matrix; a slow homology matrix is acquired through Gauss elimination of principal elements; a node classification criterion is improved, and a node relevancy model is constructed; system stability constraint conditions are comprehensively considered, and a DPSO intelligent optimization algorithm is utilized toobtain an optimization scheme of homology group strong coupling and non-homology group weak connection; the splitting decision space is highly centralized, which ensures that splitting sections underdifferent disturbances can fall into a weak connection area with high probability; internal oscillation of a homology group is avoided; the splitting effectiveness is improved; and the method has important significance in maintaining the safety and stability of a system.

Description

technical field [0001] The invention relates to the technical field of co-modulation and column analysis of electric power systems, in particular to a grid structure optimization method for realizing reliable decoupling based on node correlation. Background technique [0002] With the rapid development of the electricity market and the extensive interconnection of UHV power grids, the structure of the power grid is becoming increasingly complex, and the security and stability of the system are also facing major challenges. As the last line of defense to prevent the system from collapsing, de-loading control is of great significance to maintain the stable operation of the power grid. However, frequent large-scale power outages around the world in recent years show that the control of decoupling is still not perfect. For the large-scale power grid with a large number of nodes and complex topological structure, it is of more practical significance to study the weakly connected...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is how to accurately and quickly find the out-of-step section and disconnect it reliably in the prior art, which is the current research focus of the decoupling problem. The grouping mode is not obvious in the current decoupling process, which leads to decoupling To solve the problem of non-convergence of the strategy, provide a grid structure optimization method based on node correlation to achieve reliable disassembly, change the electrical connection between nodes by adjusting the number of lines, and realize strong coupling and non-coherence between nodes in the coherent group Weak connection of inter-group nodes, centralization of high-probability disassembly lines, to achieve the effect of narrowing the scope of disassembly decision-making

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