我国空间电力线谐波辐射现象分析
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摘要
研究了利用DEMETER卫星电磁场探测数据辨识电力线谐波辐射(PLHR,Power Line Harmonic Radiation)事件的方法,探讨了我国空间中PLHR事件的特点.通过采用时频分析和Welch功率谱估计法分析了2005—2010年6年我国空间中的全部卫星电场强度探测数据,共发现151例PLHR事件,给出了PLHR事件的统计分析和典型实例.结果表明我国空间PLHR事件的频率分布在1 000~4 500 Hz之间,多为50 Hz的奇数倍,间隔为50/100 Hz.PLHR事件与我国电网发展和变化有密切关系,与地磁活动水平无关,呈现出昼夜差异和季节差异.最后给出了影响PLHR事件探测的可能因素.
A method was studied to detect power line harmonic radiation( PLHR) events using electromagnetic field data of DEMETER satellite and the characteristics of PLHR events in China space were discussed. All the satellite electric field strength data in China space during the 6 years between 2005 and 2010 were analyzed by time-frequency analysis and Welch spectrum estimation method,with 151 PLHR events detected. Statistical analysis and typical examples were presented. The results show that the frequencies of PLHR events in China space are distributed between 1 000 and 4 500 Hz. Most spectral lines of them are odd times of 50 Hz,with frequency spacing of 50 /100 Hz. PLHR events have some closely connections with the change and development of power grid,but have no relations with geomagnetic activities,and they appear seasonal differences and differences between day and night. The possible factors that affect PLHR detecting were presented in the end.
引文
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