TY - JOUR
T1 - Robust Cooperative Control of Isolated AC Microgrids Subject to Unreliable Communications
T2 - A Low-Gain Feedback Approach
AU - Afshari, Amir
AU - Karrari, Mehdi
AU - Baghaee, Hamid Reza
AU - Gharehpetian, Gevork B.
AU - Guerrero, Josep M.
N1 - Publisher Copyright:
IEEE
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2022/3/1
Y1 - 2022/3/1
N2 - Inherent nonlinearities and uncertainties are inseparable parts of the real-life engineering systems, which make theoretical analyzes and control system designs more challenging. Usually, most of the physical parts in control systems such as controllers and actuators are subjected to saturation. On the other hand, uncertainties are ubiquitous in the physical systems, which demand some necessities in the design of the control system. Additionally, unreliability in communication networks is another practical constraint in multiagent systems, which is required to be considered. In this article, based on the mentioned issues, a distributed robust algorithm is proposed for the semiglobal stabilization of the voltage and frequency of isolated (islanded) ac microgrids considering parameters uncertainties, static nonlinearity of actuators, and unreliability in the communication network. In this regard, by employing an adaptive low-gain feedback protocol, the robust performance of the closed-loop system is guaranteed. Finally, to evaluate the proposed control strategy’s performance, digital time-domain simulations are carried out on a test microgrid system in MATLAB/Simulink environment, and the results are compared with several previously reported methods. Simulation results and comparison with previous works reveal the proposed method’s effectiveness and accuracy in regulating the microgrid voltage/frequency and providing accurate proportional active power sharing.
AB - Inherent nonlinearities and uncertainties are inseparable parts of the real-life engineering systems, which make theoretical analyzes and control system designs more challenging. Usually, most of the physical parts in control systems such as controllers and actuators are subjected to saturation. On the other hand, uncertainties are ubiquitous in the physical systems, which demand some necessities in the design of the control system. Additionally, unreliability in communication networks is another practical constraint in multiagent systems, which is required to be considered. In this article, based on the mentioned issues, a distributed robust algorithm is proposed for the semiglobal stabilization of the voltage and frequency of isolated (islanded) ac microgrids considering parameters uncertainties, static nonlinearity of actuators, and unreliability in the communication network. In this regard, by employing an adaptive low-gain feedback protocol, the robust performance of the closed-loop system is guaranteed. Finally, to evaluate the proposed control strategy’s performance, digital time-domain simulations are carried out on a test microgrid system in MATLAB/Simulink environment, and the results are compared with several previously reported methods. Simulation results and comparison with previous works reveal the proposed method’s effectiveness and accuracy in regulating the microgrid voltage/frequency and providing accurate proportional active power sharing.
KW - Frequency regulation
KW - Heuristic algorithms
KW - jointly connected topology
KW - Microgrids
KW - parametric uncertainties
KW - robust control
KW - Robustness
KW - static nonlinearities
KW - Switches
KW - Topology
KW - Uncertainty
KW - Voltage control
KW - voltage regulation
UR - http://www.scopus.com/inward/record.url?scp=85102612849&partnerID=8YFLogxK
U2 - 10.1109/JSYST.2021.3056481
DO - 10.1109/JSYST.2021.3056481
M3 - Journal article
AN - SCOPUS:85102612849
SN - 1932-8184
VL - 16
SP - 55
EP - 66
JO - IEEE Systems Journal
JF - IEEE Systems Journal
IS - 1
ER -