Abstract
At present, the distributed cooperative control scheme has been widely used in the secondary control of microgrids (MGs). However, instability factors in communication, as well as the low bandwidth and energy of the communication network, affect the safe and efficient operation of the scheme. In this paper, a distributed self-triggered H∞ consensus-based secondary control scheme is proposed to be used in voltage and frequency restoration control of AC MGs system. In the research, the external interference, the uncertainty of the communication link, the time-varying delay, and several common instability factors in topology networks are considered. Different from many existing works, this paper designs a self-triggered communication mechanism based on event-triggered, which reduces the communication burden and eliminates the computational burden of continuous monitoring of trigger conditions in event-triggered schemes. By applying the H∞ theory to the system model, the sufficient conditions for the robust consensus convergence of multi-agents under self-triggered and uncertain time-varying delay communication are obtained using the Lyapunov-Krasovskii theory. Finally, an MGs simulation model was established to evaluate the effectiveness of the proposed control strategy. The results show that the proposed secondary control scheme can restore the voltage and frequency to the reference value, and while greatly reducing the communication burden between agents.
Published Version
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