Modulated Model Predictive Control for Dynamic Stabilization of DC Microgrid

The majority of end-users in DC microgrid (MG) are electronic loads which behave as constant power load (CPL) when tightly controlled and may cause system instability. This paper proposes a stabilization method for DC MG by using the modulated model predictive control. First, a new cost function is defined, which includes the stabilization term of DC link. Then, the optimal voltage vector is derived by minimizing the cost function. After that, the optimal voltage vector is synthesized by the space vector modulation (SVM), resulting in low harmonics. Finally, simulation results are presented to verify the proposed strategy. It indicates that the proposed method can stabilize the DC MG, without implementing any additional active or passive components.