Application of df/dt in power system protection and its implementation in microcontroller based intelligent load shedding relay

Shih, Liang-Yu; Lee, W.J.; Gu, Jyh‐Cherng; Moon, Young-Hyun

doi:10.1109/icps.1991.153060

Cited by 17 publications

(10 citation statements)

References 5 publications

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“…f-df/dt characteristics: In this method frequency settings of the UFLS relays are a function of df/dt variable [18] . For large values of |df/dt| higher frequency settings are used, while for small values of |df/dt| lower frequency settings are used.…”

Section: Adaptive Ufls Schemementioning

confidence: 99%

“…This lack of adaptability may result in either overshedding or undershedding in different situations. Several conventional and adaptive UFLS schemes have been proposed in the literature [13][14][15][16][17][18][19][20][21] . However, most of them have not proposed an effective method to prevent system blackout in the case of cascading outages.…”

Section: Introductionmentioning

confidence: 99%

“…Rate of change of frequency may be a suitable parameter to enhance the adaptability of underfrequency relays [18][19][20][21] . This method could be implemented in different ways, some of which are proposed and tested on an actual network in this paper.…”

Section: Introductionmentioning

confidence: 99%

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Design of New Load Shedding Special Protection Schemes for a Double Area Power System

Seyedi¹,

Sanaye-Pas²

2009

American J. of Applied Sciences

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Abstract:In this paper several Under Frequency Load Shedding (UFLS) schemes are designed as special protection schemes to preserve the integrity of islands, formed following the outage of tie lines connecting two areas in a double area power system. For the purpose of analysis, the Iranian interconnected grid is simulated in a suitable power system analysis software. The grid is connected to the Khorasan province network, the greatest province of the country, through a double circuit tie line. Following the outage of tie lines in a double area power system the area with great import of power may face large deficiency of energy and consequently blackout may occur in the island. The purpose of this research work is to propose a special protection scheme, being capable of preserving the balance of generation and consumption in order to prevent major outage. Special types of adaptive UFLS scheme are proposed in this work.

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Section: Adaptive Ufls Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design of New Load Shedding Special Protection Schemes for a Double Area Power System

Seyedi¹,

Sanaye-Pas²

2009

American J. of Applied Sciences

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“…Some methods were also suggested for transmission lines control [4] operation. Schemes of load shedding that has been adopted in past have been discussed in power system literature [5][6][7][8]. In breaker interlock scheme, when mains breaker was sending an emergency signal to connected loads breakers all loads were shed without any sequence or priority.…”

Section: Introductionmentioning

confidence: 99%

Intelligent Load Shedding Using TCP/IP for Smart Grids

Raza¹,

Ali²,

Tareen³

et al. 2012

EPE

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Computerized power management system with fast and optimal communication network overcomes all major discrepancies of undue or inadequate load relief that were present in old conventional systems. This paper presents the basic perception and methodology of modern and true intelligent load shedding scheme in micro grids topology by employing TCP/IP protocol for fast and intelligent switching. The network understudy performs load management and power distribution intelligently in a unified network. Generated power is efficiently distributed among local loads through fast communication system of server in the form of source and clients in the form of loads through TCP/IP. The efficient use of information between server and clients enables to astutely control the load shedding in a power system of micro grids system. The processing time of above stated system comes out to be 10 ms faster than others which ensure very less delay as compared to conventional methods. The Micro Grids system operating through TCP/IP control has been implemented in MATLAB/SIMULINK and results have been verified

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“…Rate of change of frequency may be a suitable parameter to enhance the adaptability of under frequency relays [5]. This method could be implemented in different ways, some of which are tested on an actual network in this paper.…”

Section: Introductionmentioning

confidence: 99%

Design and simulation of an adaptive load shedding algorithm using a real network

Seyedi

Sanaye‐Pasand

Dadashzadeh³

2006

2006 IEEE Power India Conference

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In this paper a new adaptive under frequency load shedding algorithm is designed. The purpose of this method is to enhance the adaptability of under frequency relays and increase the security of power system during large disturbances. A suitable method to design the proposed adaptive under frequency load shedding scheme is described in detail. After completing the design, it is tested on a real power system by modeling the network in a power system studies software. Simulation results indicate that the proposed method has an improved performance for large disturbances while its response is similar to the conventional scheme for small disturbances.

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Application of df/dt in power system protection and its implementation in microcontroller based intelligent load shedding relay

Cited by 17 publications

References 5 publications

Design of New Load Shedding Special Protection Schemes for a Double Area Power System

Design of New Load Shedding Special Protection Schemes for a Double Area Power System

Intelligent Load Shedding Using TCP/IP for Smart Grids

Design and simulation of an adaptive load shedding algorithm using a real network

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