含复合储能的直流微电网故障监测与定位

Fault Monitoring and Location of DC Microgrid with Composite Energy Storage

提出一种直流微电网故障监测与定位方法,其中复合储能部分用超级电容器和蓄电池组并联模拟,利用非线性干扰观测器实时追踪系统发生故障时的扰动,配合小波包故障特征分析进行故障定位。经过数学建模和特征能量选取,利用db15小波对各共模电流进行小波分解,最终选线定位线路故障。利用非线性干扰观测器实时了解系统发生的故障,克服非线性干扰观测无法对故障定位的局限。此外,搭建含复合储能的直流微电网Matlab模型,提出故障监测算法,实现了线路故障监测和定位。

This paper presents a method to control the fault detection and location of DC microgrid,the nonlinear disturbance observer is used to track the real-time disturbance when the fault occurs,and the fault location is carried out with the fault feature analysis of wavelets packet.After mathematical modeling and feature energy selection,using DB15 wavelet decomposition of the common-mode current,the final line selection,fault location.The combination of the two methods can not only make use of the nonlinear disturbance observer to know the fault of the system in real time,but also overcome the limitation of the nonlinear disturbance observer to locate the fault.A DC microgrid Matlab model with composite energy storage is built,and a fault detection algorithm is proposed to realize line fault detection and location.