Energy Management Control Strategy of Stand-alone DC Micro-grid

Maintenance of the stability of DC bus voltage and the reasonable distribution of the energy has great guiding significance to the reliable operation of the DC micro-grid control system. The DC micro-grid control system based on photovoltaic power generation system was analyzed, and a new control strategy for energy management was put forward. According to the control strategy of Photovoltaic DC/DC converter under different light conditions on the state of off-grid, the storage battery energy storage unit was used as support. Different energy management control strategy when the battery charge or discharge was used to maintain the stability of DC bus voltage and provide power for DC load. Its core is to make the photovoltaic cell and the battery energy storage unit coordinated work, to ensure the efficient and stable operation of the dc micro-grid, finally the experimental results verified the correctness of the proposed control strategy.