Mehrdad Beykverdi - Department of Electrical Engineering, Science and Research branch, Islamic Azad University, Tehran, Iran
Ahmad Ashouri - Department of Electrical Engineering, Khodabandeh branch, Islamic Azad University, Khodabandeh, Iran
Babak Safari Chabok - Department of Power System Engineering, Tarbiat Modares University, Tehran, Iran

This investigation tried to control a standalone hybrid DC microgrid in islanded operation mode by using decentralized power management strategies. Unlike common approaches where a Photovoltaic (PV) module is controlled as current source, the proposed strategy controls PV arrays as a voltage source that follows the current/voltage adaptive characteristic curve. Proposed I/V characteristic for hybrid PV/battery adapts the hybrid unit behavior independently in accordance with the load demand. Hence, the PV module can spend its maximum power on load demand and supply the extra energy on charging the battery energy storage system (BESS), which will maintain the power balance within the DC microgrid and regulating DC bus voltage. The proposed control system can be applied on any DC microgrid to achieve control objectives through decentralized procedure, without need for telecommunication links or any central energy management system. In order to validate the proposed strategies, the control system was implemented on a DC microgrid within MATLAB/SIMULINK, where the simulation results were analyzed and validated.

DC microgrid, power management, decentralized control, hybrid unit, droop characteristic