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Island detection method suitable for micro-grid including multiple inverter-based distributed generations

An inverter-type distributed and island detection technology, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problem of reducing reactive power disturbances, etc.

Inactive Publication Date: 2015-04-29
TIANJIN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

This method does not detect the blind area, and reduces the amount of reactive power disturbance through segmented reactive power disturbance

Method used

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  • Island detection method suitable for micro-grid including multiple inverter-based distributed generations
  • Island detection method suitable for micro-grid including multiple inverter-based distributed generations
  • Island detection method suitable for micro-grid including multiple inverter-based distributed generations

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Embodiment Construction

[0050] The technical solution of the invention will be described in detail below in conjunction with the embodiments and with reference to the accompanying drawings.

[0051] The invention provides an islanding detection method applicable to a plurality of IBDG microgrids by adopting a segmented adaptive reactive power disturbance IBDG reactive power control strategy. This method has no island detection blind area, can reduce reactive power disturbance during normal operation, thereby reducing the impact on power quality, and is suitable for IBDGs operating with integral power factor and non-integer power factor, and each IBDG does not need to communicate 1. The synchronization of reactive power disturbance can be guaranteed only through local information, thereby ensuring the reliability and effectiveness of islanding detection.

[0052] 1. Island test system and PQ decoupling control strategy for IBDG

[0053] According to different operating modes, distributed power can ge...

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Abstract

The invention relates to a self-adaptation positive sequence current quick break protection method for a distribution network containing inverter-based distributed generations (IBDGs), in particular to an island detection method suitable for a micro-grid including multiple inverter-based distributed generations (IBDGs). The island detection method includes the steps that segmented reactive power perturbations, frequency boundary values of the segmented reactive power perturbations and starting criteria used when the segmented reactive power perturbations are switched are set in an initialized mode, wherein the starting criteria comprise the first starting criterion which is set according to the situation that the first segment reactive power perturbations of the different IBDGs are synchronous, the second starting criterion which is set according to the situation that the first segment reactive power perturbations of the different IBDGs are not synchronous, but overlapping exists and the starting criterion which is set according to the situation that the first segment reactive power perturbations of the different IBDGs are not synchronous, and overlapping does not exist; whether system frequency meets the three starting criteria or not is detected, and the reactive power perturbations are exerted according to a detection result; whether the criteria for determining an island are met is detected. Reactive power perturbations when a system operates normally in a grid-connected mode are reduced.

Description

Technical field [0001] The invention belongs to the field of micro-grid protection and control of electric power systems, and aims at the problem of unplanned islanding of micro-grids that may occur, and proposes an island detection method suitable for micro-grids with multiple inverter-type distributed power sources. Background technique [0002] The occurrence of unplanned island operation of microgrid is accidental and uncertain. When the public coupling point or its upstream circuit breaker trips due to misoperation, system failure, etc., the distributed power generation in the microgrid may not be able to detect that the microgrid has been disconnected from the system in time and continue to operate. At this time, the unplanned island operation of the microgrid may bring a series of problems to the safe and stable operation of the power system, such as reclosing failure, extended or even failure of backup and automatic switching time, and deterioration of power quality ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 李永丽陈晓龙
Owner TIANJIN UNIV
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