Open Access
ARTICLE
Stability Analysis of Cyber-Physical Micro Grid Load Frequency Control System with Time-Varying Delay and Non-Linear Load Perturbations
D. Vijeswaran1,*, V. Manikandan2
1 Department of Electrical and Electronics Engineering, Coimbatore Institute of Technology, Coimbatore
641014, India.
* Corresponding Author: D. Vijeswaran. Email: .
Computer Modeling in Engineering & Sciences 2019, 121(3), 801-813. https://doi.org/10.32604/cmes.2019.07793
Abstract
In a cyber-physical micro-grid system, wherein the control functions are
executed through open communication channel, stability is an important issue owing to
the factors related to the time-delay encountered in the data transfer. Transfer of feedback
variable as discrete data packets in communication network invariably introduces
inevitable time-delays in closed loop control systems. This delay, depending upon the
network traffic condition, inherits a time-varying characteristic; nevertheless, it adversely
impacts the system performance and stability. The load perturbations in a micro-grid
system are considerably influenced by the presence of fluctuating power generators like
wind and solar power. Since these non-conventional energy sources are integrated into
the power grid through power electronic interface circuits that usually works at high
switching frequency, noise signals are introduced into the micro-grid system and these
signals gets super-imposed to the load variations. Based on this back ground, in this paper,
the delay-dependent stability issue of networked micro-grid system combined with timevarying
feedback loop delay and uncertain load perturbations is investigated, and a
deeper insight has been presented to infer the impact of time-delay on the variations in
the system frequency. The classical Lyapunov-Krasovskii method is employed to address
the problem, and using a standard benchmark micro-grid system, and the proposed
stability criterion is validated.
Keywords
Cite This Article
Vijeswaran, D., Manikandan, V. (2019). Stability Analysis of Cyber-Physical Micro Grid Load Frequency Control System with Time-Varying Delay and Non-Linear Load Perturbations.
CMES-Computer Modeling in Engineering & Sciences, 121(3), 801–813.