Initiative power distribution network electricity isolated island identification method and device based on network model

Abstract

The invention discloses an initiative power distribution network electricity isolated island identification method and device based on a network model. The method comprises the steps of acquiring the information of each switch in an initiative power distribution network, and generating an initiative power distribution network node-edge network model through equivalence of a switch-line physical model of the initiative power distribution network; establishing an adjacent matrix according to the adjacent state of each switch based on the acquired switch information in the initiative power distribution network and the initiative power distribution network node-edge network model; judging the connectivity of each switch in the initiative power distribution network based on the established adjacent matrix, and establishing a zone matrix to be used for describing switch numbers contained in each zone; establishing a switch type vector according to equipment connected with the switches; obtaining a zone type matrix according to the zone matrix and the switch type vector, so that the operation modes of switches contained in the zones of the initiative power distribution network and the zones can be obtained and an electricity isolated island can be identified. By the adoption of the method and device, a network structure in the initiative power distribution network and operation mode can be effectively determined.

Description

technical field [0001] The invention relates to the technical field of power system power distribution, in particular to a method and device for identifying power islands in an active power distribution network based on a network model. Background technique [0002] my country clearly pointed out in the "13th Five-Year Plan" that it is necessary to build a clean, low-carbon, safe and efficient modern energy system, promote the development of wind power and photovoltaic power generation, and vigorously develop distributed power generation represented by new energy power generation. In 2008, the C6.11 project team of the International Large Power Grid Conference proposed the concept of active distribution network to realize the access and efficient utilization of large-scale intermittent distributed power generation on the distribution side. [0003] Compared with the traditional distribution network, the network structure of the active distribution network is more flexible an...

AI Technical Summary

Problems solved by technology

Passive detection judges whether there is an island by directly measuring the output power of the distributed power supply or the change in voltage or frequency at the common connection point. The principle is simple and easy to implement. However, passive detection has threshold requirements and there are certain detection blind spots.

Active detection identifies islands by generating small disturbances to narrow the detection blind zone, but the disturbances generated are not conducive to the transient stability of the system

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