TY  - JOUR
TI  - Stability regions in time delayed two-area LFC system enhanced by EVs
AB  - With the extensive usage of open communication networks, time delays have become a great concern in load
frequency control (LFC) systems since such inevitable large delays weaken the controller performance and even may
lead to instabilities. Electric vehicles (EVs) have a potential tool in the frequency regulation. The integration of a large
number of EVs via an aggregator amplifies the adverse effects of time delays on the stability and controller design of
LFC systems. This paper investigates the impacts of the EVs aggregator with communication time delay on the stability.
Primarily, a graphical method characterizing stability boundary locus is implemented. The approach is based on the
stability boundary locus that can be easily determined by equating the real and the imaginary parts of the characteristic
equation to zero. For a given time delay, the method computes all the stabilizing proportional-integral (PI) controller
gains, which constitutes a stability region in the parameter space of PI controller.The effects of communication delay
and participation factor of EVs aggregator on the obtained stability regions is thoroughly examined. Results clearly
illustrate that stability regions become smaller as the time delay and participation factor of EVs increase. Finally, the
accuracy of region boundaries known as real root boundary and complex root boundary is confirmed by time-domain
simulations along with an independent algorithm, quasipolynomial mapping-based root finder (QPmR) algorithm.
AU  - Naveed, Ausnain
AU  - Ayasun, Saffet
AU  - sonmez, sahin
DO  - 10.3906/elk-2104-113
PY  - 2022
JO  - Turkish Journal of Electrical Engineering and Computer Sciences
VL  - 30
IS  - 1
SN  - 1300-0632
SP  - 249
EP  - 262
DB  - TRDizin
UR  - http://search/yayin/detay/527973
ER  -