A Novel Local Control Technique For Converter-Based Renewable Energy Resources in the Stand-Alone Dc Micro-Grids

This paper presents a novel local control method for the converterbased renewable energy resources in a standalone dc microgrid based on energy analysis. the studied dc microgrid comprises the renewable energy resources, backup generation unit, and batterybased energy storage system, which are connected to the common dcbus through the buck and bidirectional buckboost converters. the proposed control method satisfies the stability of the microgrid output variables, along with current control and voltage regulation by controlling the switching functions of the converters, regardless of the energy resource dynamics. the dynamic component of the switching function is extracted as a control signal using the statefeedback through a mathematical method. the control inputs are designed based on lyapunov stability theorem to guarantee the stability of output variables (dcbus voltage and generated currents) in a standalone dc microgrid through an energy analysis. the proposed distributed controller can be easily generalized as a platform with all kinds of the standalone dc microgrids comprising any type or number of distributed generations such as renewable energy resources, fossilfuelbased generations, and energy storage units. other features of this local control method are simplicity, celerity, comprehensiveness, and independence of the distributed generations. the dynamic performance assessment of the proposed controller is verified through a simulation in matlab/simulinkò environment. the results validate the accuracy and stability of the proposed control strategy in various operating conditions.