A Verification of Improved Distributed Control in DC Microgrid based on Hardware-in-the-loop Simulation

An improved distributed control is proposed for enhancing a flexibility of changing the control strategy depending on the dc microgrid situation. The conventional distributed control has the limitation of changing control strategy because of its control method. In the proposed control method, a local controller of conventional distributed control divided into two layers. First, the local layer performs inner voltage and current loops. Second, the flexible layer performs the primary and secondary control. Since the flexible layer performs most of the control for operating dc microgrid, the control strategy can be changed easily by changing the primary and secondary control in this layer. Moreover, the burden of data processing at the local controller is reduced through the flexible layer of the proposed method. Therefore, it becomes easy to manufacture converters in multi-vendor without control platform standardization. The experimental results based on Typhoon HIL 402 are presented to demonstrate the proposed approach.