&amp;#x0394;P &amp;#x2014; &amp;#x0394;Q area assessment of temporary unintentional islanding with P/f and Q/V droop controlled PV generators in distribution networks

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

doi:10.1109/ecce.2015.7309938

Cited by 4 publications

(4 citation statements)

References 10 publications

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“…The research to solve this problem is currently underway on the output control of DG when islanding operation occurs. Several papers have applied the output control through the droop control of DG [11][12][13][14][15]. However, these controls have a slow response to prevent over-voltage, which rises rapidly due to the output control by the droop characteristic curve.…”

Section: P Lmentioning

confidence: 99%

“…In this regard, the only existing studies for rapid restoration from faults are as follows: a multi-stage/multiple micro-grid technique for dividing the islanding operation section [7,8], an islanding operation method engaging the droop control of the DG when the fault section is isolated [9][10][11][12][13], a voltage control strategy that involves switching between the grid-connected mode and islanding operation mode for the VSC (Voltage-Sourced Converters) type of DGs [14], a Multi Agent System (MAS) technique for dividing switches, DGs, and load into agents for quick fault restoration [15][16][17][18][19][20], and a fault restoration method for minimizing the number of switch operations for load transfer [21]. However, these papers have focused on permanent faults and temporary faults have not been considered.…”

Section: Introductionmentioning

confidence: 99%

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Temporary Fault Ride-Through Method in Power Distribution Systems with Distributed Generations Based on PCS

et al. 2020

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The current practice of Distributed Generation (DG) disconnection for every fault in distribution systems has an adverse effect on utility and stable power trading when the penetration level of DGs is high. That is, in the process of fault detecting and Circuit Breaker (CB) reclosing when a temporary fault occurs, DGs should be disconnected from the Point of Common Coupling (PCC) before CB reclosing. Then all DGs should wait at least 5 minutes after restoration for reconnection and cannot supply the pre-bid power in power market during that period. To solve this problem, this paper proposes a control method that can keep operating without disconnection of DG. This control method is verified through modeling and simulation by the PSCAD/EMTDC software package for distribution systems with DGs based on PCS (Power Conditioning Systems) and CB reclosing protection.

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Section: P Lmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Temporary Fault Ride-Through Method in Power Distribution Systems with Distributed Generations Based on PCS

et al. 2020

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“…The behaviour of ES, PV inverters and protection reclosing are independent of each other. Literature [13][14][15][16][17] study in detail the risk of non-synchronous closing of circuit breaker caused by unintentional island. Different from the above references, with the help of ES, the unintentional island of the PV station which is caused by tie line fault is turned into controllable in this paper.…”

Section: Introductionmentioning

confidence: 99%

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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“…The main problem for passive methods is non-detection zone (NDZ) for small changes in power, voltage and frequency values and angles. Some authors analysed change of power during islanding [5,6] and general performance assessment of inverterbased photo-voltaic distributed systems [7] along with efficient energy management for PV systems [8] and maximum power point tracking in PV systems [9]. Regarding islanding operation analysis and recommendations for distribution networks, UK scenario is recommended for studying [10].…”

Section: Introductionmentioning

confidence: 99%

Probability risk assessment of island operation event for large scale photovoltaic plant

et al. 2019

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Original methodology for the calculation of island operation event occurrence possibility is proposed for the photovoltaic power plants connected to medium voltage grid. Within the methodology description, event fault tree with number of pairs of basic initial events is discussed, where probability for the basic events are defined and flow chart for the proposed calculation is given. The novelty in the approach for probability calculation includes also proposal for development of frequency distribution functions for concerned power generation and consumption variables which have to be modelled for the probability calculations, for which the triangular distributions curves have been chosen. Being boundary conditions for definition of non-detected island event, borders of non-detection zones are defined for the common island detection protection functions: over frequency and under frequency, over voltage and under voltage and rate of change of frequency functions. Comparison of the island event probability is presented on case study example, with conclusion that standard voltage and frequency protection alone are not satisfying, but ROCOF protection could be suitable, subject to particular local grid characteristic and calculative verification of probability.

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ΔP — ΔQ area assessment of temporary unintentional islanding with P/f and Q/V droop controlled PV generators in distribution networks

Cited by 4 publications

References 10 publications

Temporary Fault Ride-Through Method in Power Distribution Systems with Distributed Generations Based on PCS

Temporary Fault Ride-Through Method in Power Distribution Systems with Distributed Generations Based on PCS

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

Probability risk assessment of island operation event for large scale photovoltaic plant

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