نتایج جستجو برای: under frequency load shedding

تعداد نتایج: 1613373  

2013
Zhaoou Song Junyong Liu Youbo Liu Masoud Bazargan Wuxing Liang

This paper presents an adaptive Under Frequency Load Shedding scheme based on Wide Area Measurement System. Due to the lack of enough adaptability to the operation state of the system, the traditional successive approximation under frequency load shedding method will cause excessive cut or undercut problems inevitably. This method consists first in a comprehensive weight index including load ch...

2013
Mukesh Kumar Kirar Renuka Kamdar Manoj Kumar

This paper presents transient stability analysis and enhancement of Industrial Cogeneration Plant (ICP) using Artificial Neural Network (ANN) based adaptive load shedding. By selecting the total in-plant generation, spinning reserve, total plant load and rate of change of frequency as the input neurons of the ANN, the minimum amount of load shedding is determined to maintain in-plant load-gener...

This paper presents an optimal method of frequency load shedding (UFLS) based on the rate of change of frequency of load (ROCOFL) in islanded distribution networks (DN). The proposed method minimizes the average amount of penalties paid by the independent operator of the network by utilizing the relevant cost function. The function of islanded distribution network occurs after an error in the s...

2015
K.Reddy Gayathri

Under voltage load shedding (UVLS) and under frequency load shedding (UFLS) is plays vital role in the power system operation. As large disturbances are occur frequently in previous days. Generally these two methods are work independently from each other, and are not designed to integrated way to use their combined effect on load shedding. The reactive power hardly consider in load shedding pro...

This paper proposes a new voltage stability assessment method based on vector analysis method. This index extraction process relies on measurements of active and reactive powers from connected buses to the generator buses. Therefore, a limit for beginning of voltage collapse is determined based on the maximum power transfer theory. On the other hand, when the system requires load shedding, a ne...

Islanding operation is one of the main features of a MicroGrid (MG), which is realized regarding the presence of distributed energy resources (DERs). However, in order to deal with the control challenges, which an MG faces during island operation, particularly when the transition is associated with certain excessive load, an efficient control strategy is required. This paper introduces a Centra...

2017
Foday Conteh Shota Tobaru Mohamed E. Lotfy Atsushi Yona Tomonobu Senjyu

In recent years, the use of renewable energy sources in micro-grids has become an effective means of power decentralization especially in remote areas where the extension of the main power grid is an impediment. Despite the huge deposit of natural resources in Africa, the continent still remains in energy poverty. Majority of the African countries could not meet the electricity demand of their ...

2012
H. Mokhlis J. A. Laghari A. H. A. Bakar M. Karimi

The frequency of power system is very sensitive to load changing when operating in islanded mode. This may causes overloading or loss of generation cases. Under-Frequency Load Shedding (UFLS) Scheme is commonly applied to stabilize the frequency during these cases. Conventional UFLS scheme operates successfully in interconnected grid system and may not work well when applied to DG based system ...

2016
M. Lu W. A. W. Zainal Abidin

In this paper, Swarm Evolutionary Programming (SEP) method incorporating modified System Frequency Response (SFR) model is proposed to solve the optimal Under-frequency Load Shedding (UFLS) scheme design problem. The objective function of this problem is to minimize transient frequency and steady-state frequency deviation from nominal and total quantum of load shedding. The constrained optimiza...

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