孟明,贺海博,王志鹏,李圆智.直流微网低电压穿越控制策略研究[J].电测与仪表,2017,54(2):. mengming,hehaibo,wangzhipeng,李圆智.LVRT Control Scheme for DC Microgrid[J].Electrical Measurement & Instrumentation,2017,54(2):.
For low voltage ride through (LVRT) issue of DC microgrid system, the power flow characteristics under different operating conditions are analyzed, and a overall control method of the coordinated control for photovoltaic/battery/loads as well as the coordinated control for the active and reactive power is put forward, which is based on the comprehensive considerations of the LVRT control requirements and the effect for system operation comes from the random fluctuations of PV outputs and load during the fault. During low voltage of the system, the coordinated control for photovoltaic/battery/load can maintain the constant DC-link voltage and balance the system power. Meanwhile, the grid-side converter is employed to realize the coordinated control for the active and reactive power according to the grid voltage change level, thus providing reactive power to support grid-side voltage recovery and avid overcurrent of the grid-side converter output. The results implemented in Matlab/Simulink show that the proposed control scheme can achieve the optimal utilization of energy, meet the LVRT control requirements and ensure the reliable operation of the system, so that the effectiveness of the LVRT control strategy is verified.
