Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/626658
Title: Combinational scheme for voltage and frequency recovery in an islanded distribution system
Authors: Sara Nourollah;Abolfazl Pirayesh;Farrokh Aminifar
subject: combinational voltage-frequency recovery scheme|under voltage-frequency LS scheme|network nose curves|linearised piecewise function|distributed generation units|UVFLS scheme|voltage stability|transmission level|LSAs|frequency stability|quick computational algorithm|low-voltage autonomous microgrids|voltage effect|modified standard IEEE 37-bus system|frequency droop characteristics|load shedding|islanded distribution system|voltage-load level|load shed amounts
Year: 2016
Publisher: IEEE
Abstract: In low-voltage autonomous micro-grids, preserving both frequency and voltage stabilities at event of severe contingencies is an unsolved technical challenge. The conventional control algorithms are designed based on either one of frequency and voltage stabilities and do not bring satisfactory performance for real world practices. As per experiences in the transmission level, load shedding (LS) can be an effective countermeasure to overcome this challenge. This study introduces an under voltage-frequency LS (UVFLS) scheme to achieve proper load shed amounts (LSAs). The voltage effect is accounted for in two online and real-time mode stages. A quick computational algorithm is proposed in the online stage to obtain `nose' curves of the network as a linearised piecewise function of voltage/load level. Then in the real-time operation stage, according to these curves and the present operating points of the system, optimum LSA is calculated. The frequency droop characteristics of distributed generation units are employed to incorporate the effect of frequency on the LSA. Simulation studies are carried out on two distribution systems, a 5-bus autonomous micro-grid and the modified standard IEEE 37-bus system. Validation of the proposed method shows that frequency and voltages are restored to their desired ranges using the novel UVFLS algorithm.
URI: http://localhost/handle/Hannan/162228
http://localhost/handle/Hannan/626658
ISSN: 1751-8687
1751-8695
volume: 10
issue: 12
Appears in Collections:2016

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Title: Combinational scheme for voltage and frequency recovery in an islanded distribution system
Authors: Sara Nourollah;Abolfazl Pirayesh;Farrokh Aminifar
subject: combinational voltage-frequency recovery scheme|under voltage-frequency LS scheme|network nose curves|linearised piecewise function|distributed generation units|UVFLS scheme|voltage stability|transmission level|LSAs|frequency stability|quick computational algorithm|low-voltage autonomous microgrids|voltage effect|modified standard IEEE 37-bus system|frequency droop characteristics|load shedding|islanded distribution system|voltage-load level|load shed amounts
Year: 2016
Publisher: IEEE
Abstract: In low-voltage autonomous micro-grids, preserving both frequency and voltage stabilities at event of severe contingencies is an unsolved technical challenge. The conventional control algorithms are designed based on either one of frequency and voltage stabilities and do not bring satisfactory performance for real world practices. As per experiences in the transmission level, load shedding (LS) can be an effective countermeasure to overcome this challenge. This study introduces an under voltage-frequency LS (UVFLS) scheme to achieve proper load shed amounts (LSAs). The voltage effect is accounted for in two online and real-time mode stages. A quick computational algorithm is proposed in the online stage to obtain `nose' curves of the network as a linearised piecewise function of voltage/load level. Then in the real-time operation stage, according to these curves and the present operating points of the system, optimum LSA is calculated. The frequency droop characteristics of distributed generation units are employed to incorporate the effect of frequency on the LSA. Simulation studies are carried out on two distribution systems, a 5-bus autonomous micro-grid and the modified standard IEEE 37-bus system. Validation of the proposed method shows that frequency and voltages are restored to their desired ranges using the novel UVFLS algorithm.
URI: http://localhost/handle/Hannan/162228
http://localhost/handle/Hannan/626658
ISSN: 1751-8687
1751-8695
volume: 10
issue: 12
Appears in Collections:2016

Files in This Item:
File Description SizeFormat 
7551301.pdf852.97 kBAdobe PDFThumbnail
Preview File
Title: Combinational scheme for voltage and frequency recovery in an islanded distribution system
Authors: Sara Nourollah;Abolfazl Pirayesh;Farrokh Aminifar
subject: combinational voltage-frequency recovery scheme|under voltage-frequency LS scheme|network nose curves|linearised piecewise function|distributed generation units|UVFLS scheme|voltage stability|transmission level|LSAs|frequency stability|quick computational algorithm|low-voltage autonomous microgrids|voltage effect|modified standard IEEE 37-bus system|frequency droop characteristics|load shedding|islanded distribution system|voltage-load level|load shed amounts
Year: 2016
Publisher: IEEE
Abstract: In low-voltage autonomous micro-grids, preserving both frequency and voltage stabilities at event of severe contingencies is an unsolved technical challenge. The conventional control algorithms are designed based on either one of frequency and voltage stabilities and do not bring satisfactory performance for real world practices. As per experiences in the transmission level, load shedding (LS) can be an effective countermeasure to overcome this challenge. This study introduces an under voltage-frequency LS (UVFLS) scheme to achieve proper load shed amounts (LSAs). The voltage effect is accounted for in two online and real-time mode stages. A quick computational algorithm is proposed in the online stage to obtain `nose' curves of the network as a linearised piecewise function of voltage/load level. Then in the real-time operation stage, according to these curves and the present operating points of the system, optimum LSA is calculated. The frequency droop characteristics of distributed generation units are employed to incorporate the effect of frequency on the LSA. Simulation studies are carried out on two distribution systems, a 5-bus autonomous micro-grid and the modified standard IEEE 37-bus system. Validation of the proposed method shows that frequency and voltages are restored to their desired ranges using the novel UVFLS algorithm.
URI: http://localhost/handle/Hannan/162228
http://localhost/handle/Hannan/626658
ISSN: 1751-8687
1751-8695
volume: 10
issue: 12
Appears in Collections:2016

Files in This Item:
File Description SizeFormat 
7551301.pdf852.97 kBAdobe PDFThumbnail
Preview File