求翻译：文献[4-5]研究了基于WAMS的电网扰动识别方法，分析了电网中经常出现的扰动（短路、切机和切负荷）的特征，采用了一种以自由分布模式识别为基础的方法来判断扰动类型。是什么意思？

Literature [ 4-5 ] studied the disturbance identification method based on grid WAMS analyzed disturbances (short circuit, cutting machine and load shedding ) often appear in the grid characteristics, using a free- distribution pattern recognition -based approach to

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The literature( 4-5) has studied based on the WAMS electrical network perturbation recognition methods, analyzed which in the electrical network frequently to appear the perturbation (short circuit, cuts machine and cuts load) the characteristic, used one kind to judge the perturbation type take the

[4-5] study on WAMS based power system disturbance identifying method, appear frequently in the analysis grid disturbance (short circuit, cutting machine and load-shedding) feature was used, in which distribution method based on pattern recognition of freedom to determine disturbance types.

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