Distributed frequency control in power grids under limited communication

Abstract

Abstract-In this paper, we analyze the impact of communication failures on the performance of optimal distributed frequency control. We consider a consensus-based control scheme, and show that it does not converge to the optimal solution when the communication network is disconnected. We propose a new control scheme that uses the dynamics of power grid to replicate the information not received from the communication network, and prove that it achieves the optimal solution under any single communication link failure. In addition, we show that this control improves cost under multiple communication link failures.Next, we analyze the impact of discrete-time communication on the performance of distributed frequency control. In particular, we will show that the convergence time increases as the time interval between two messages increases. We propose a new algorithm that uses the dynamics of the power grid, and show through simulation that it improves the convergence time of the control scheme significantly.

Joint Frequency Regulation and Economic Dispatch Using Limited Communication

“…The network topology (Fig. 2) and the data are identical to those in [11]. We study the control after a perturbation of 5 units load increase at node 3.…”

“…Loss of communication may lead to sub-optimal control. Using power line measurement, a control policy was developed in [11] to withstand any single communication link failure. The role of communication network topology on power grid control has been studied in [12], [13].…”