**7. Discussion**

Based on the simulation and experimental results, the effectiveness of the PFCS and the proposed DCV restoration algorithm for DCMG has been comprehensively validated. The PFCS of DCMG consisting of thirteen operating modes effectively maintains the system power balance both in the grid-connected and islanded modes. Also, the proposed DCV restoration algorithm rapidly recovers the DCV through the LECM operation even in critical cases, which enhances the reliability and expansion of DCMG. However, it is worth noting that the performance of the proposed scheme was evaluated only for DCMG, which is composed of a single battery and a single WPGS. As a result, the proposed scheme can be achieved by a simple control structure. However, since multiple units of ESS and RES are being integrated into DCMGs recently, the implementation of the DCV restoration algorithm in this configuration becomes an important issue in view of the requirement of power-sharing among multiple power systems. DCV restoration in the presence of parallel-connected multiple power systems needs several considerations and modifications in the algorithm; as such, future research works will be devoted to this issue.
