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H∞ Load Frequency Control for Power Systems Under Communication Delays: An Event-Triggered Dynamic Output Feedback Scheme

In this brief, the problem of the load frequency control for power systems suffered from communication delays is discussed based on a dynamic output feedback scheme. An output-based event detection mechanism, where the error signal is defined as the difference between the latest transmitted data and the average value of the currently sampled data and the latest transmitted data, is introduced to reduce the triggering rate while ensuring the control performance. Combining such an event-triggered control scheme with dynamic output feedback control strategy, the concerned closed-loop system is established. After that, with the aid of Lyapunov-Krasovskii functional and appropriate matrix decoupling technique, some sufficient criteria for the performance analysis and controller design are deduced. Finally, the availability of the developed control strategy is verified through a simulation example with two cases.