TY - JOUR
T1 - An Improved Result on H-infinity Load Frequency Control for Power Systems With Time Delays
AU - Shen, Hao
AU - Jiao, Shiyu
AU - Park, Ju H.
AU - Sreeram, Victor
PY - 2021/9
Y1 - 2021/9
N2 - Due to the increasinglymarketized demands of power systems, the dedicated communication channel used by the traditional load frequency control (LFC) scheme is ineluctably replaced by highly open communication networks, which may introduce constant, and time-varying delays. Hereupon, for those two kinds of communication methods, this article explores the LFC problem of power systems in consideration of constant, and time-varying delays. By utilizing the Lyapunov stability theory, and an improved inequality technique, some criteria for guaranteeing the stability, and the specified H-infinity performance of the closed-loop system are obtained, and a PID-type controller with the consideration of time delays and disturbance is designed. The case studies take one-area delayed LFC scheme and the traditional/deregulated three-area LFC scheme as examples to discuss the relationships between the maximum allowable delay, and the controller gain as well as the relationships between time delays, and the minimum H-infinity performance index, respectively. Finally, the effectiveness of the method proposed is verified, and the comparison results show certain advantages of the method presented in this article over the existing literature.
AB - Due to the increasinglymarketized demands of power systems, the dedicated communication channel used by the traditional load frequency control (LFC) scheme is ineluctably replaced by highly open communication networks, which may introduce constant, and time-varying delays. Hereupon, for those two kinds of communication methods, this article explores the LFC problem of power systems in consideration of constant, and time-varying delays. By utilizing the Lyapunov stability theory, and an improved inequality technique, some criteria for guaranteeing the stability, and the specified H-infinity performance of the closed-loop system are obtained, and a PID-type controller with the consideration of time delays and disturbance is designed. The case studies take one-area delayed LFC scheme and the traditional/deregulated three-area LFC scheme as examples to discuss the relationships between the maximum allowable delay, and the controller gain as well as the relationships between time delays, and the minimum H-infinity performance index, respectively. Finally, the effectiveness of the method proposed is verified, and the comparison results show certain advantages of the method presented in this article over the existing literature.
KW - H-infinity performance
KW - load frequency control (LFC)
KW - power systems
KW - static output feedback control (SOFC)
KW - time delays
KW - STABILITY ANALYSIS
KW - INEQUALITY
U2 - 10.1109/JSYST.2020.3014936
DO - 10.1109/JSYST.2020.3014936
M3 - Article
SN - 1932-8184
VL - 15
SP - 3238
EP - 3248
JO - IEEE Systems Journal
JF - IEEE Systems Journal
IS - 3
ER -