Akademik Veri Yönetim Sistemi
El-Cezeri Fen ve Mühendislik Dergisi, cilt.9, sa.2, ss.382-393, 2021 (Scopus)
In load frequency control (LFC) systems, it is important to transmit control signals from remote
terminal units (RTU) to the control center and from the control center to the plant side. Because of this data
exchanges, time delays in signal transmission become unavoidable. These delays reduce the dynamic
performance of the LFC system and may even destabilize the system. This paper is dedicated to the delaydependent stability analysis of the LFC scheme containing a renewable energy power generation subsystem. The
system under study includes photovoltaic system (PV), ultra-capacitor (UC) bank for energy storage, wind
turbine generator (WTG), diesel generator (DG) and fuel cell (FC) system. Using a frequency-domain exact
method, stability delay margins of the system are determined theoretically for different values of inertia,
damping factor as well as controller gains. The relation between the controller gains and the delay margin is
investigated. The upper bound of the delay time for which the LFC system is marginally stable is known as
stability delay margin. Theoretical delay margins are verified by time-domain simulation studies. Delay margin
computations are realized by using an analytical method approach. Proportional-integral (PI) controller is used
for controlling proposed power generation storage system. PI Controller parameters are chosen in a wide range
to observe the effect of the parameter space on delay margin variation. Simulation studies verify the
effectiveness of the proposed method