A Calculation Method of Safety Domain Boundary of Distribution System Based on Feeder Interconnection Relationship

Abstract

The invention discloses a distribution system security region boundary calculation method based on a feeder interconnection relationship. The method comprises the following steps of establishing a distribution system security region model based on the feeder interconnection relationship according to main transformer N-1 and feeder N-1 constraint conditions; calculating a distribution system security region boundary according to the distribution system security region model; and evaluating the security of a distribution system through the distribution system security region boundary. The method has the advantages that the existing security region boundary calculation method is enabled to be further precise, the interconnection relationship between main transformers and feeders can be simultaneously reflected, main transformer N-1 and feeder N-1 faults are simultaneously calculated, the method provides a theoretical support for more precise, safe and high-efficiency operation of a distribution network, the online real-time security monitoring, defense and control of the distribution system are enabled to become more comprehensive and precise, and preconditions are provided for further improving the level of line and main transformer load rate to a precise N-1 security limit. Under the background of future intelligent power grids, the method has a great application prospect.

Description

technical field [0001] The invention relates to the field of safe operation and evaluation of power distribution systems, in particular to a method for calculating the safety domain boundaries of power distribution systems based on feeder interconnection relationships. Background technique [0002] With the development of smart distribution network, distribution automation will continue to be popularized, and the ability to quickly transfer power will become a new boundary condition for future distribution network operation [1] , the distribution network will be closer to the transmission network in terms of automation. It makes it possible to use the security domain method in the distribution network security assessment and improve its security and efficiency. [0003] In recent years, a series of achievements have been made in the research of distribution system security domain, and the concept and preliminary model of distribution system security domain (Distribution Sys...

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Problems solved by technology

[0005] 1) The safety boundary calculated by the existing method cannot be completely consistent with the N-1 point-by-point simulation results, resulting in a larger safety domain and inaccurate evaluation results of the distribution system safety;

[0006] 2) The interconnection relationship model based on the main transformers of the substation only considers the N-1 fault of the main transformer, and cannot guarantee that all feeders pass the N-1 safety verification, resulting in insufficient comprehensive and accurate safety prevention and control of the power distribution system

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