Abstract
This article introduces a new energy management control method for energy storage systems used in dc microgrids. The proposed control method is based on an adaptive droop control algorithm that maintains the dc-bus voltage in the desired range. In the islanded mode of operation, tightly regulating the bus voltage is very challenging. The proposed control technique is based on a nonlinear droop profile with four adaptive parameters. These parameters are determined using the optimization algorithms to achieve reliable and efficient operation. The adaptive parameters enable the proposed nonlinear droop controller to tightly regulate the bus voltage during various changes in loads/sources within a dc MG. The stability of the proposed system for a very wide range of operating conditions is proved. Simulation and experimental results verify the feasibility of the proposed approach and demonstrate its superior performance compared to the conventional controllers.
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