DC distribution systems and DC microgrids are gaining increasing attention as emerging alternative energy solutions due to their compatibility with DC characteristics of most distributed energy resources,storage devices and loads.To address the challenges of power balance and stability in traditional DC systems,a decentralized control strategy and nonlinear stability analysis method for autonomous DC grid systems with energy storage devices is proposed.Firstly,a nonlinear DC grid model is constructed,including various DC distributed energy resources,parallel battery branches and variable DC loads,which explores the implementation path of simple decentralized controllers on electronic power interfaces.Secondly,a cascaded controller scheme is designed,which is completely independent from system parameters and incorporated into system model for comprehensive nonlinear stability analysis.And then,by applying advanced Lyapunov method,a rigorous analysis of stability and convergence of the entire nonlinear system is conducted without relying on specific system characteristics,which ensures the stable operation of system.Finally,through the detailed simulations,the effectiveness of the proposed scheme in achieving system stability and power balance is demonstrated.
DC distribution systemsDC microgridsstability analysisdroop controlDC/DC converterLyapunov method
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