An Islanding Detection Technique for Inverter-Based Distributed Generation in Microgrids

Mazaher Karimi,Hannu Laaksonen,Kimmo Kauhaniemi,Mohammad Farshad,Qiteng Hong

doi:10.3390/en14010130

Mazaher Karimi, Hannu Laaksonen + Show 3 more

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https://doi.org/10.3390/en14010130

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Abstract

This article proposes a new passive islanding detection technique for inverter-based distributed generation (DG) in microgrids based on local synchrophasor measurements. The proposed method utilizes the voltage and current phasors measured at the DG connection point (point of connection, PoC). In this paper, the rate of change of voltages and the ratio of the voltage and current magnitudes (VoI index) at the PoC are monitored using micro-phasor measurement units. The developed local measurements based decentralized islanding detection technique is based on the VoI index in order to detect any kind of utility grid frequency fluctuations or oscillations and distinguishing them from islanding condition. The simulation studies confirm that the proposed scheme is accurate, robust, fast, and simple to implement for inverter-based DGs.

Highlights

Detection Technique forIn recent decades, the significant penetration of distributed generations (DGs) in distribution networks has created new challenges in protection of these networks
In the as voltage and current, with μPMUs installed in DGs connection points (PoC) in disthe tribution network
The proposed islanding detection technique was considered under the following operating conditions: (a) Islanding event and (b) non-islanding events, such as single or three-phase to ground fault, the sudden connection of loads, and capacitor switching in grid connection mode

Summary

Introduction

The significant penetration of distributed generations (DGs) in distribution networks has created new challenges in protection of these networks. One of the most well-known of these challenges is the detection of islanding conditions [1]. A part of the distribution network with DGs is unintentionally separated from the main grid, often caused by protection relays and circuit breakers operation [2,3]. The islanding condition should be detected appropriately. It can cause successive damages to DGs and their equipment. Non-detected islanding condition may result in voltage and frequency deviations from the standard ranges, improper operation of protections, and hazards for personnel [4]

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Results

Conclusion