【摘要】 针对直流微网系统要求可靠性高、线路阻抗小、短路故障检测速度快，构建基于太阳能、储能单元和负载的环形直流微网结构，通过分析短路故障的特性，提出基于短路电流变化率的故障检测方法。在MATLAB/Simulink中搭建母线电压为400 V的直流微网模型进行仿真，仿真结果表明所提方法可以在2 ms内实现对母线和单元短路故障的检测，确保整个系统可靠工作。更多还原

【Abstract】 To meet the requirements of high reliability of DC microgrid system, small line impedance and fast short-circuit fault detection, a ring DC microgrid structure based on solar energy, energy storage unit, and load is constructed. The fault detection method based on the short-circuit current change rate is proposed by analyzing the characteristics of short-circuit faults. A DC microgrid model with a bus voltage of 400 V is built and simulated in MATLAB/Simulink. The simulation results show that the proposed method can achieve the detection of bus and cell short-circuit faults in less than 2 ms, ensuring the reliable operation of the whole system.更多还原