Abstract
Microgrids have been widely developed for the convenient integration of various renewable energy sources. The prediction errors of these distributed generations may reduce the economic benefits of microgrids because there is a time-scale gap between average voltage recovery and economic dispatch. Therefore, a distributed fixed-time secondary control strategy is proposed in this paper, which can achieve average voltage restoration and economic dispatch on the same time-scale. Firstly, a voltage observer is designed to obtain average voltage information. Secondly, a fixed-time voltage regulator is designed to achieve average voltage recovery by adjusting the primary control input. In addition, the fixed-time power optimizer achieves economic dispatch by matching all incremental cost data. Furthermore, based on the Lyapunov stability theory, the fixed-time convergence performance of the proposed controller is analyzed. Finally, a test system is built to verify the superior performance of the proposed control strategy.
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