Robust Load Frequency Control for Uncertainties Multi-Area Power Systems With Couplings of Systems Dynamics and Reconfigurable Communication Networks

This article focuses on the challenging problems for robust load frequency control (RLFC) in multi-area power systems considering unknown parameter uncertainties in both LFC operation conditions of nominal power systems and coupling inputs under reconfigurable communication networks. A class of coupled smart grids is modeled in which the process dynamics are composed of time-varying vector functions of scalar combinations of the states and communication networks that are not interconnected. In part I, the networks can be any connected static configuration but not dynamically changing network configurations. To overcome these issues, a distributed RLFC strategy is developed that uses a configurable communication network. This strategy can handle the system coupling dynamics and obtain global asymptotic stability for multi-area power systems with multiple aggregated uncertainties. Furthermore, a distributed adaptive RLFC protocol is proposed to schedule the control gains and time-varying adaptive coupling dynamics for the multi-area power systems with aggregated system uncertainties consisting of aggregated parameter uncertainties, coexisting matched, and mismatched parameter uncertainties that can be unknown. The proposed strategies are verified through the modeling of a three-area power system with configurable communication networks. The results show that the proposed methods are efficient. Specifically, for the case of unknown coexisting matched and mismatched parameter uncertainties, the LFC of closed-loop power systems is asymptotic stability without relying on any bounded-state set.