微网孤岛运行时短路故障检测的仿真研究

利用Matlab/simulink对含分布式电源的微网进行建模与仿真,对微网由孤岛切换至并网运行方式下的运行工况进行仿真实验,仿真结果验证了所构建的微网仿真模型的有效性.在该仿真模型的基础上加入三相故障模块模拟微网孤岛运行时发生短路故障,选取db小波检测短路故障发生后的电压信号,仿真结果表明db小波能够准确地检测短路故障信号的奇异点,为下一步改善微网电能质量提供有力依据.

Simulation of Short-Circuit Fault Detection in Islanded Operation of Micro-Grids

The modeling and simulation of micro-grids containing distributed generation is conducted with Matlab/Simulink.Moreover,simulation experiments are performed on the grid operation condition when switching from islanded mode to grid-connected mode,which validates the effectiveness of the modeling.A three-phase fault module is then added to the model to simulate the short-circuit fault in micro-grid＇ s islanded operation.The db wavelet is selected to detect the voltage of the short-circuit fault.The simulation results show that the db wavelet can precisely detect the singularity of the short-circuit fault signal,which may provide significant support t for improving the power quality of micro-grids.