求翻译：近年来, 已有文献介绍应用小波变换方法进行电能质量评估[6]、电磁暂态波形分析[7]和电力系统扰动建模[8]等电能质量问题的研究。是什么意思？

In recent years, the literature describes the application of wavelet transform for power quality assessment [6], the electromagnetic transient waveform analysis [7] and power system disturbance modeling [8] and other power quality problems.

In recent years, there is literature on application wavelet transform methods for Power Quality Assessment [ 6], electromagnetic transient waveform analysis [ 7] and electrical disturbances modeling [ 8] and power quality issues.

In recent years, had the literature to introduce carries on the electrical energy quality using the wavelet transformation method to appraise (6), the electromagnetism transition condition profile analyzes (7) and electrical energy quality question and so on electrical power system perturbation mode

In recent years, the document describes the application of wavelet transform method for power quality assessment [6], electromagnetic transient waveform analysis [7] and modeling of power system disturbance [8] study of power quality problems.

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