Virtual DC machine control strategy of energy storage converter in DC microgrid

The bus voltage of DC microgrid is the key indicator of the stable operation of the system. The energy storage units play an important role in maintaining the stability of DC bus voltage in DC microgrid. In this paper, a virtual DC machine (VDCM) control strategy of energy storage converter in DC microgrid is adopted, aiming to solve the problem that the DC bus voltage is vulnerable to disturbed by renewable energy or loads and cannot be well maintained. This control method simulates the characteristics of the DC machine and is a robust and flexible DC/DC converter control method, which can make the converter and the DC bus flexible connection, thus effectively restrain the DC bus voltage disturbance so as to enhance the stability of DC microgrid. A simulation model of DC microgrid with photovoltaic, energy storage unit and loads is established in MATLAB/Simulink. Simulation results show the feasibility and validity of the adopted control method.