Analysis of load-induced unintentional islanding in Low Voltage grids with PV generators

Sgarbossa, Riccardo; Lissandron, Stefano; Mattavelli, Paolo; Turri, Roberto; Cerretti, Alberto

doi:10.1109/compel.2014.6877136

Cited by 14 publications

(14 citation statements)

References 16 publications

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“…The scenario that we consider in this work consists of a LV inverter connected to the main grid at the Point of Common Coupling (PCC) and having in parallel some local loads, as in [5], [11] (Fig. 2).…”

Section: System Description and Area Of Uncontrolled Islandingmentioning

confidence: 99%

“…While the risk of permanent unintentional islanding has already been addressed with constant power inverters by other papers, for instance [11], in this work we show how this risk is affected considering P/f and Q/V droop regulation, first enabling only one of them, i.e. P/f or Q/V, and then both of them.…”

Section: Introductionmentioning

confidence: 97%

“…This paper focuses on the risk of permanent islanding operation [5], [11], that is the risk of an unintentional islanding whose steady-state frequency and voltage remain within the 978-1-4799-8586-9/15/$31.00 c 2015 IEEE allowed thresholds, for instance those in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

“…1. So to maintain this operation the stability of the islanded system is also required: in [11] a stability analysis of the islanded operating point is introduced to investigate such aspect. Another key problem is the temporary islanding issue [5] that consists of transient islanding operation, just after the grid disconnection: its study is related to understand if islanded operation holds, according to the protection thresholds, for a limited period of time after the disconnection.…”

Section: Introductionmentioning

confidence: 99%

“…P/f or Q/V, and then both of them. To this aim, Section II contains a description of the DER-load system [11] and of the unintentional islanding risk definition that is used herein. Then, a steady-state analysis of this system is provided in Section III in terms of intersection of the generation and load characteristics to prove the increased islanding risk.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Impact of non-simultaneous P/f and Q/V grid code requirements on PV inverters on unintentional islanding operation in distribution network

Lissandron

Sgarbossa

Santa

et al. 2015

2015 IEEE 6th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)

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The analysis of unintentional islanding in distribution grids with a large penetration of renewable energy sources is of increasing interest due to the recently introduced requirements of P/f and Q/V supporting capabilities of Distributed Energy Resources (DERs) and the wider frequency and voltage ranges, DERs should be able to operate with, before protection tripping. DER anti-islanding protections, if present, may fail to detect this grid transition and so uncontrolled islanding operation may appear. Since this operating mode may be dangerous for the electric network operation and may cause damages for the grid equipment, in this paper the increase of its risk due to P/f and Q/V droop characteristics of generators is addressed. Analytic results are initially derived for the steady-state unintentional islanding operation and then they are validated on a laboratoryscale grid setup. The proposed investigation will show that the risk of permanent unintentional islanding increases introducing P/f or Q/V droop regulation and that such risk is maximum including both the P/f and Q/V droop regulations, rather than only one of them. I. INTRODUCTIONNowadays the employment of renewable energy resources is driving an increase of the amount of embedded generation that is connected to the Medium Voltage (MV) and Low Voltage (LV) distribution networks via power electronic interfaces (inverters). New European standards state the reference technical rules for the connection of active users to the grid and for their behavior during temporary voltage and frequency variations [1]- [3]. Moreover, these standards together with some country-level ones are imposing the participation of Distributed Energy Resources (DERs) to the voltage and frequency regulation to improve the system stability, through the P/f and Q/V droop characteristics. One of the most relevant modifications is the extension of the frequency range that is allowed during normal operation of DERs from the traditional thresholds 49.7 Hz and 50.3 Hz to the less stringent values 47.5 Hz and 51.5 Hz, and the extension of the voltage levels to the range ±15% of the rated voltage ( Fig. 1) [4], [5].

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Section: System Description and Area Of Uncontrolled Islandingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Impact of non-simultaneous P/f and Q/V grid code requirements on PV inverters on unintentional islanding operation in distribution network

Lissandron

Sgarbossa

Santa

et al. 2015

2015 IEEE 6th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)

Self Cite

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Data analytics and computational methods for anti-islanding of renewable energy based Distributed Generators in power grids

Vyas

Kumar

Kavasseri

2017

Renewable and Sustainable Energy Reviews

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Tie line fault ride‐through method of photovoltaic station based on cooperative strategy of energy storage, relay protection and photovoltaic inverters

Wei

Wen

et al. 2023

IET Generation Trans & Dist

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The fault of the tie line between the photovoltaic (PV) station and the grid is a serious fault for the PV station. It will cause the PV station to operate into an unintentional island. The uncontrolled Island voltage and frequency will inevitably lead to the disconnection of the inverter in the station. This situation will bring great losses to PV operators and impact to the power grid. In order to deal with the tie line fault, this paper analyzes the operation characteristics of PV stations in case of tie line fault firstly. Then a tie line fault ride-through method based on cooperative strategy of small capacity energy storage (ES), relay protection and PV inverters is proposed. The islanding switching control strategies of PV and ES are designed respectively. The cooperative strategy of protection, PV controller and ES controller is formulated as well. The real-time digital simulator (RTDS) closed-loop test platform including line protection device, ES controller and PV controller is built to verify the effectiveness of the proposed method.

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Analysis of load-induced unintentional islanding in Low Voltage grids with PV generators

Cited by 14 publications

References 16 publications

Impact of non-simultaneous P/f and Q/V grid code requirements on PV inverters on unintentional islanding operation in distribution network

Impact of non-simultaneous P/f and Q/V grid code requirements on PV inverters on unintentional islanding operation in distribution network

Data analytics and computational methods for anti-islanding of renewable energy based Distributed Generators in power grids

Tie line fault ride‐through method of photovoltaic station based on cooperative strategy of energy storage, relay protection and photovoltaic inverters

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