TITLE:
A Method for the Design of UFLS Scheme with Dynamic Correction
AUTHORS:
Zhaoou Song, Junyong Liu, Youbo Liu, Masoud Bazargan, Wuxing Liang
KEYWORDS:
UFLS; WAMS; Active- power Deficit; Comprehensive Weight
JOURNAL NAME:
Energy and Power Engineering,
Vol.5 No.4B,
October
22,
2013
ABSTRACT: 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 characteristics and inertias of generators.
Then active-power deficit calculation based on the Low-order Frequency Response
Model, concerning the effect of voltage was put forward. Finally, a dynamic
correction of the load shedding amount was proposed to modify the scheme. This
approach was applied to IEEE-39 system and the simulation results indicated
that the proposed method was effective in reducing the load shedding amount as
well as the frequency recovery time.