NDLI: Improved UFLS with consideration of power deficit during shedding process and flexible load selection

Content Provider	IET Digital Library
Author	Jallad, Jafar Mekhilef, Saad Mokhlis, Hazlie Laghari, Javed Ahmad
Abstract	This study presents an improved under-frequency load shedding (UFLS) scheme that can detect power deficit during the shedding process and accordingly adjust the amount of load shedding. This is achieved by continuous monitoring of the overshooting signal of the second frequency derivative of the centre of inertia. Once detected, an equivalent system inertia constant is estimated in order to quantify the new power deficit. The scheme is also equipped with an optimisation algorithm to determine the best combination of loads that is close to the amount of power deficit, which minimises frequency overshoot/undershoot. The optimisation technique selected for this work is based on particle swarm optimisation. The performance of the proposed UFLS scheme was validated using a modified IEEE 33 bus with two mini-hydro generators and one full converter wind turbine. The system and the proposed UFLS was modelled and simulated in PSCAD/EMTDC software. The results confirmed that the proposed scheme is capable of shedding loads with minimum undershoot/overshoot, and detect and estimate a new power deficit during load shedding. The results reported by the proposed scheme proved to be significantly better than those reported by conventional and adaptive load shedding schemes.
Starting Page	565
Ending Page	575
Page Count	11
ISSN	17521416
Volume Number	12
e-ISSN	17521424
Issue Number	Issue 5, Apr (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rpg/12/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2017.0170
Journal	IET Renewable Power Generation
Publisher Date	2018-01-04
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Equivalent System Inertia Constant Flexible Load Selection Frequency Overshoot Frequency Undershoot Full Converter Wind Turbine Hydroelectric Generator Load Shedding Minihydro Generator Modified IEEE 33 Bus Optimisation Algorithm Optimisation Technique Overshooting Signal Particle Swarm Optimisation Power Deficit Power System Economics Power System Managemen Power System Operation Second Frequency Derivative Shedding Process UFLS Underfrequency Load Shedding Wind Turbine
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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