Energy storage systems have become inevitable components of a DC microgrid in terms of pacifying voltage/current fluctuations that are unavoidable due to the unpredictable, intermittent nature of renewable energy system and load. These fluctuations normally result in power quality issues in addition to stability issues. The transient pressure on the DC bus increases with an increase in distance between the source and load. Further, it affects the other connected loads in a single-bus system. Hence, this paper proposes a multi-bus dc microgrid structure integrated with a supercapacitor transient power supply to deal with the fluctuating DC loads. In the proposed model, the steady-state power requirement of the load is expected to be met by the DC bus, while the dedicated supercapacitor bank would compensate for the transient power requirements. The proposed model has been developed and simulated in MATLAB/Simulink. The simulation results shows that the proposed scheme is capable to reduce the transient pressure on the DC bus and improve the power quality of the DC microgrid. Also, hardware experiments have been conducted to validate the accuracy and feasibility of the proposed system.

就可调节的电压/电流波动而言，由于可再生能源系统和负载的不可预测的间歇性，不可避免的是，储能系统已成为DC微电网的必然组成部分。除了稳定性问题之外，这些波动通常还导致电能质量问题。直流母线上的瞬态压力随着电源和负载之间距离的增加而增加。此外，它会影响单总线系统中的其他连接负载。因此，本文提出了一种集成了超级电容器瞬态电源的多总线直流微电网结构，以应对波动的直流负载。在提出的模型中，直流总线有望满足负载的稳态功率要求，而专用的超级电容器组将补偿瞬态功率要求。所提出的模型已在MATLAB / Simulink中进行了开发和仿真。仿真结果表明，该方案能够降低直流母线上的暂态压力，提高直流微网的电能质量。另外，已经进行了硬件实验以验证所提出系统的准确性和可行性。