Fault section diagnosis method for multi-feeder radial distribution network connected to multiple distributed power sources

Abstract

The invention discloses a fault section diagnosis method for a multi-feeder radial distribution network connected with multiple distributed power supplies, and is used for fault section judgment after a distribution network is connected with distributed power supplies. Included are a data acquisition module, a logic judgment module and a telecontrol execution module. The data acquisition module is used for acquiring information of a current element and a direction element, the telecontrol execution module controls the on and off of a feeder circuit breaker, and the logic judgment module comprises an initial positioning module, a distributed power supply section judgment module and a distributed power supply rear section judgment module. The invention combines original protection wiring actual conditions, requires neither addition of the direction element into each protection device in an original distribution network, nor re-setting of a constant value on each protection device, achieves the positioning of fault sections through the functional modules directly by judging the current change at a feeder outlet in the distribution network, the direction elements connected with the distributed power supplies and the comparing element output of each protection current element, and has high economical efficiency and feasibility.

Description

technical field [0001] The invention relates to a fault location technology, in particular to a fault section diagnosis method for multiple distributed power sources connected to a radial multi-feeder distribution network. Background technique [0002] With the rapid development of new energy, more and more distributed power sources such as wind turbines, solar photovoltaic panels, and fuel cells are connected to the distribution network feeder nearby. Changes, the new power supply added will also provide fault current to the fault point when a fault occurs, so the traditional three-stage current protection will not be able to judge the correct fault section, and some protections may malfunction, resulting in unnecessary expansion of the power outage range . Especially when there are multiple feeders in the distribution network, not only the protection on a single feeder will malfunction, but also the feeder and the feeder will interfere with each other. At present, when t...

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Problems solved by technology

However, this method of installing directional elements on each protection is very expensive. Therefore, after the distributed power supply is connected, it is hoped that there will be an effective fault judgment method with low investment cost

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