Active power distribution network fault recovering method including distributed power supply and micro power grid

Abstract

The invention relates to an active power distribution network fault recovering method including a distributed power supply and micro power grid and belongs to the technical field of informatization and automation of electric power systems. The method comprises following steps of a, establishing external power supply ability of the micro power grid; b, forming a feasible plan island; c, carrying out fault diagnosis, determining whether there is a distributed power supply or a micro power grid in a fault feed line, if yes, entering step d, and if not, entering step e; d, disconnecting a switch required for formation of the distributed power supply and the micro power grid; e, carrying out fault positioning and isolation; f, carrying out network reconstruction on the active power distributionnetwork; and g, carrying out fault recovering: carrying out operation of the same term on all islands, carrying out grid connection again and then recovering to an operation mode before the fault. According to the invention, based on the island division strategy and network reconstruction strategy of the active power distribution network, effects on fault recovery imposed by active management measures and the distributed power supply / micro power grid are considered; and loss of power failures caused by faults of the power distribution network is effectively reduced.

Description

technical field [0001] The invention relates to an active distribution network fault recovery method including a distributed power supply and a micro-grid, and belongs to the technical field of power system informatization and automation. Background technique [0002] At present, as far as the world is concerned, countries with higher energy utilization efficiency and better environmental protection are more enthusiastic about developing distributed power supply and micro-grid technology. At the same time, developed countries have been exploring the power supply mode and fault recovery mode combining large power grid system and distributed power generation system to improve the reliability of power supply of the system. In the literature "Impact of intentional islanding of distributed generation on electricity market prices", H.H.Zeineldin, K.Bhattacharya et al. studied the distribution network fault recovery steps including DG on the basis of traditional algorithms, but its...

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Problems solved by technology

[0004] The existing fault recovery strategies mainly have the following three problems: (1) The influence of distribution network active management strategies on island division and fault recovery is not considered; (2) The application of microgrid power supply capacity assessment in fault recovery is lacking; ( 3) Lack of active distribution network fault recovery methods that systematically consider distributed power sources and microgrids

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