Filters








2,957 Hits in 5.1 sec

Techno-economic impacts of automatic undervoltage load shedding under emergency

Abouzar Estebsari, Enrico Pons, Tao Huang, Ettore Bompard
2016 Electric power systems research  
The main symptoms of voltage collapse are low voltage profiles, heavy reactive power flows, insufficient local reactive support, and heavily loaded systems.  ...  While some features, such as Automatic Voltage Regulation (AVR), are common in all countries, for what concerns undervoltage load shedding (UVLS), to contrast voltage instability or collapse, different  ...  The main characteristics of UVLS schemes are voltage threshold values, time delays, locations and amounts of load to be shed.  ... 
doi:10.1016/j.epsr.2015.10.016 fatcat:qgykwfxvafg2lo5ktqtfw2l23y

Defining Control Strategies for MicroGrids Islanded Operation

J.A.P. Lopes, C.L. Moreira, A.G. Madureira
2006 IEEE Transactions on Power Systems  
Index Terms-Dynamic response, energy storage, frequency control, microgrid, power system dynamic stability, voltage control. I.  ...  In such conditions, the microgrid must have the ability to operate stably and autonomously. An evaluation of the need of storage devices and load shedding strategies is included in this paper.  ...  ACKNOWLEDGMENT The authors would like to thank all research teams of the Mi-croGrids project for valuable discussions.  ... 
doi:10.1109/tpwrs.2006.873018 fatcat:c62dfk2ffjgdznt3sl47vw3cp4

Adaptive Under-Frequency Load Shedding Scheme in System Integrated with High Wind Power Penetration: Impacts and Improvements

2017 Energies  
The location and capacity model of LS, which is based on the load characteristics, can ameliorate the frequency recovery process.  ...  As the requirements of economical operation and reliability on power grid are enhanced gradually nowadays, the existing under frequency load shedding (UFLS) scheme is not quite fit for the modern power  ...  Author Contributions: All of the authors have contributed to this research. Shun Li proposed the novel under frequency load shedding methodology, did the simulations and wrote the manuscript.  ... 
doi:10.3390/en10091331 fatcat:guc2lnmshfdxdgqw73irwmbnem

Determination of Maximum Wind Power Penetration in an Isolated Island System by Considering Spinning Reserve

Chia-An Chang, Yuan-Kang Wu, Bin-Kwie Chen
2016 Energies  
However, because the wind turbine output is unstable, high wind power penetration in the system may relatively affect the power quality (voltage and frequency) and reliability of the system.  ...  the reliability and power quality of the power system.  ...  Because current operation criteria on unit scheduling regard wind power as a negative load, the net load leads to a low number of online diesel engines and low SR.  ... 
doi:10.3390/en9090688 fatcat:rojxzc456nekxar4jc3h3237jy

Impact of Islanding Detection Time Duration on the Stable Operation of a Synchronous Generator Controlled Microgrid

N. W. A. Lidula, A. D. Rajapakse, D. Muthumuni, C. Senkow
2017 Technology and Economics of Smart Grids and Sustainable Energy  
The simulation study results revealed that the control mode transition delay has a significant impact on the amount of load that need to be shed to preserve the stability of the islanded microgrid.  ...  A detailed microgrid simulation model was developed and its frequency and voltage control was designed based on the most generic schemes identified after a profound literature survey on practical microgrids  ...  In dynamic load shedding, the amount of load to be shed at each stage is determined by considering the magnitude of generation loss and available load on each feeder, in addition to the frequency characteristic  ... 
doi:10.1007/s40866-016-0019-9 fatcat:2l3ldvjlvvgyvatq42cqjyxk5u

Wind Power Impact on Power System Dynamic Performance [chapter]

Emmanuel S.
2010 Wind Power  
In Fig.1 a concise www.intechopen.com Wind Power Impact on Power System Dynamic Performance 397 classification of power system stability is provided.  ...  However, the situation depends on the scheduling of the power units and the amount of allocated spinning reserve.  ...  Wind Power Impact on Power System Dynamic Performance, Wind Power, S M Muyeen (Ed.), ISBN: 978-953-7619-81-7, InTech, Available from: http://www.intechopen.com/books/windpower/wind-power-impact-on-power-system-dynamic-performance  ... 
doi:10.5772/8353 fatcat:toq36qtnuzhyxhp4s6oeck24pm

A Review of Data-Driven Short-Term Voltage Stability Assessment of Power Systems: Concept, Principle, and Challenges

Jiting Cao, Meng Zhang, Yang Li, Jun Peng
2021 Mathematical Problems in Engineering  
In particular, in modern power grids, the proportion of dynamic loads with fast recovery characteristics such as air conditioners, refrigerators, and industrial motors is increasing.  ...  As well as there is an increasing proportion of different forms of renewable energy in power systems. Therefore, the short-term voltage stability (STVS) of power systems cannot be ignored.  ...  In urban load centers, the proportion of dynamic loads with fast recovery characteristics such as air conditioners, refrigerators, and industrial motors is increasing, and short-term voltage stability  ... 
doi:10.1155/2021/5920244 fatcat:bqa2hfkej5bhhflyqoan2ake3m

Load Shedding Application within a Microgrid to Assure Its Dynamic Performance during Its Transition to the Islanded Mode of Operation

Dorel Soares Ramos, Tesoro Elena Del Carpio-Huayllas, Ricardo Leon Vasquez-Arnez
2013 Energy and Power Engineering  
load connections by some low voltage consumers, etc.  ...  A microgrid overload can occur due to various reasons ranging from poor load schedule, inadequate switching of circuits within the microgrid, outage of one or more generators inside the microgrid, illegal  ...  Acknowledgements The authors would like to acknowledge the help of M. T. Bassini for his aid with some of the machine control models.  ... 
doi:10.4236/epe.2013.57047 fatcat:sz54326spbfcliqcu22hy426iu

Consequence and impact of electric utility industry restructuring on transient stability and small-signal stability analysis

V. Vittal
2000 Proceedings of the IEEE  
This paper examines the impact of restructuring on power system dynamic analysis. It specifically addresses issues related to transient stability analysis and small-signal stability analysis.  ...  The consequences and impact of each of these topics on the nature of the studies conducted are examined and discussed.  ...  Undervoltage Load Shedding Heavily loaded transmission systems with limited reactive power supply experience low voltages and are susceptible to voltage instability.  ... 
doi:10.1109/5.823998 fatcat:sqiupyzz7vbmtiofmr25kp733e

Impacts of Wind Farms on Power System Stability [chapter]

Ahmed G.
2013 Modeling and Control Aspects of Wind Power Systems  
When determining adequacy of the grid, both steady-state load flow and dynamic system-stability analysis are needed.  ...  Impacts of Wind Farms on Power System Stability http://dx.doi.org/10.5772/55090  ... 
doi:10.5772/55090 fatcat:oruesae345efvnryvmp76ww2hm

Dynamic Performance Assessment of Wind Energy Pump Storage Units in Crete's Power System

Emmanuel Karapidakis, Pavlos Georgilakis, Antonis G. Tsikalakis, Yiannis A. Katsigiannis, Marios Moschakis
2014 Materials Science Forum  
In this paper, the impact of high wind power penetration on the dynamic performance and stability of power systems is investigated.  ...  Large scale integrating of wind power generation into a grid may raise serious stability issues.  ...  Acknowledgement This research has been co-financed by the European Union (European Social Fund -ESF) and Greek national funds through the Operational Program "Education and Lifelong Learning" of the National  ... 
doi:10.4028/www.scientific.net/msf.792.305 fatcat:yppsloxoirb2phgz7ka7jcfu4a

Microgrids of Commercial Buildings: Strategies to Manage Mode Transfer From Grid Connected to Islanded Mode

Lasantha Gunaruwan Meegahapola, Duane Robinson, A. P. Agalgaonkar, S. Perera, P. Ciufo
2014 IEEE Transactions on Sustainable Energy  
An iterative procedure based on bifurcation theory is proposed in [13] to examine the microgrid stability by assessing the impacts of drooping characteristics meant for frequency and voltage regulation  ...  Most of these studies have mainly focused on controlling the microgrid sources during M mode transition and have placed less emphasis on the impact of load dynamics within the microgrid.  ... 
doi:10.1109/tste.2014.2305657 fatcat:3as5mz6g4ncv5lgpcybi7ffcy4

Electrical system design in FLNG offshore unit

Jong-Su Kim, Deok-Ki Kim
2015 Journal of the Korean Society of Marine Engineering  
Various simulation tests were performed to evaluate the performance of the electrical power plant, focusing on the efficiency of the electrical system to secure the aspects of plant safety.  ...  This design study analyzes the electrical system for the FLNG unit to improve the safety of operation and maintenance in the field.  ...  The VSD associated with this motor can be designed and selected to optimize the stability of the overall electrical system, minimize the impact on the compressor, and ease the return to full-production  ... 
doi:10.5916/jkosme.2015.39.10.1037 fatcat:w7fqnpopmrd6nln4ydzecnkwwq

A comprehensive review on control techniques for stability improvement in microgrids

Sahil Mehta, Prasenjit Basak
2021 International Transactions on Electrical Energy Systems  
The voltage fluctuations are duly considered in the perspective of load shedding, type of loads, power unbalancing, and different types of faults in microgrid systems.  ...  The main contribution of this paper is an in-depth analysis of research in microgrid based on small-signal, transient, and voltage stability.  ...  The impact of dynamic load like induction motors is very much significant in MG stability.  ... 
doi:10.1002/2050-7038.12822 fatcat:hqt7sk4kczfd3fetugol3x6kzy

Review of PES Failures and Lessons Learned from the Tunisian Blackout of August 2014

A. Haj Hamida, K. Ben Kilani, M. Elleuch
2018 Journal of Electrical Systems  
Corrective controllers performances are assessed: load shedding scheme for variable primary operating reserve quantities, in off-peak and peak loading conditions.  ...  Many stability issues are addressed: angular stability, fault critical clearing time, frequency recovery, and PSS performances.  ...  Acknowledgment The present paper is a joint framework between the Tunisian Electricity and Gas Company (STEG) and the National Engineering school of Tunis (ENIT).  ... 
doaj:846eae84c8a241bb997d089533c5609d fatcat:fps7uwhppngdvnunsjubldf2za
« Previous Showing results 1 — 15 out of 2,957 results