基于短时傅里叶变换的直流电晕无线电干扰激发电流计算
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摘要
为了实现基于物理过程的对无线电干扰值的快速计算,通过实验测量得到电晕脉冲统计规律,基于实验测量的数据使用短时傅里叶变换(STFT),对圆形导线和绞线在不同电压下的无线电干扰激发电流进行了研究,宏观上计算了激发电流的峰值和有效值。并采用随机脉冲生成的方法进行仿真,使用STFT得到了电晕电流随时间变化的频谱以及激发电流峰值和有效值随时间变化的动态值。结果表明,电晕电流脉冲的幅值近似服从对数正态分布,而间隔时间近似服从指数分布。随着电压的增大,脉冲频率增大,激发电流的特征量也相应增大。STFT很好地反映了频谱随时间变化的动态过程,与电晕电流的时域波形有着明确的对应关系。
In order to realize the rapid calculation of radio interference values based on physical processes, the statistical regularity of corona current pulse was obtained from experiments and the measured data. Short-time Fourier transform(STFT) was used to calculate the radio interference excitation currents of cylindrical wire and stranded wire under different voltages. The peak and RMS values of the excitation currents were calculated. By using STFT and the method of generating random pulses, frequency spectra along with time of corona currents and dynamic peak and RMS values of excitation currents were calculated. Results show that the corona current pulse amplitudes approximately obey the lognormal distribution, and the time intervals approximately obey an exponential distribution. With the increasing voltage,pulse frequency and the characteristics of excitation current increase accordingly. STFT reflects the dynamic process of spectrum and has a definite corresponding relationship with the time domain waveform of corona current.
In order to realize the rapid calculation of radio interference values based on physical processes, the statistical regularity of corona current pulse was obtained from experiments and the measured data. Short-time Fourier transform(STFT) was used to calculate the radio interference excitation currents of cylindrical wire and stranded wire under different voltages. The peak and RMS values of the excitation currents were calculated. By using STFT and the method of generating random pulses, frequency spectra along with time of corona currents and dynamic peak and RMS values of excitation currents were calculated. Results show that the corona current pulse amplitudes approximately obey the lognormal distribution, and the time intervals approximately obey an exponential distribution. With the increasing voltage,pulse frequency and the characteristics of excitation current increase accordingly. STFT reflects the dynamic process of spectrum and has a definite corresponding relationship with the time domain waveform of corona current.
引文
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[2]怡勇,张楚岩,王元九,等.导线表面污秽对正极性单电晕点可听噪声频谱特性的影响[J].高电压技术,2016,42(6):1990-1996.YI Yong,ZHANG Chuyan,WANG Yuanjiu,et al.Influence of conductor surface’s contamination on spectrum characteristics of audible noise from single corona point under positive DC voltage[J].High Voltage Engineering,2016,42(6):1990-1996.
[3]舒印彪,张文亮.特高压输电若干关键技术研究[J].中国电机工程学报,2007,27(31):1-6.SHU Yinbiao,ZHANG Wenliang.Research of key technologies for UHV transmission[J].Proceedings of the CSEE,2007,27(31):1-6.
[4]YANG Y,LU J,LEI Y.A calculation method for the hybrid electric field under UHVAC and UHVDC transmission lines in the same corridor[J].IEEE Transactions on Power Delivery,2010,25(2):1146-1153.
[5]李敏,曾嵘,余占清,等.高海拔地区直流输电线路的电晕损耗[J].高电压技术,2011,37(3):746-751.LI Min,ZENG Rong,YU Zhanqing,et al.Corona loss of HVDCtransmission line in high altitude area[J].High Voltage Engineering,2011,37(3):746-751.
[6]HIRSCH F W,SCHAFER E.Progress report on the HVDC test line of the 400 kV-forschungsgemeinschaft:corona losses and radio interference[J].IEEE Transactions on Power Apparatus&Systems,1969,88(7):1061-1069.
[7]KNUDSEN N,ILICETO F.Contribution to the electrical design of EHVDC overhead lines[J].IEEE Transactions on Power Apparatus&Systems,1974,93(1):233-239.
[8]ANZIVINO L D,GELA G,GUIDI W W,et al.HVDC transmission line reference book[M].California,USA:Electric Power Research Institute,1993:1-188.
[9]Radio interference characteristics of overhead power lines and high-voltage equipment,part 1:description of phenomena:CISPR18-1-1982[S],1982.
[10]BRAUN S,DONAUER T,RUSSER P.A real-time time-domain EMImeasurement system for full-compliance measurements according to CISPR 16-1-1[J].IEEE Transactions on Electromagnetic Compatibility,2008,50(2):259-267.
[11]尹晗.直流输电线路高频电晕电流与无线电干扰的转换关系[D].北京:清华大学,2014.YIN Han.Correlations between high-frequency corona currents and radio interference of DC transmission lines[D].Beijing,China:Tsinghua University,2014.
[12]KHALIFA M M,KAMAL A A,ZEITOUN A G,et al.Correlation of radio noise and quasi-peak measurements to corona pulse randomness[J].IEEE Transactions on Power Apparatus&Systems,1969,88(10):1512-1521.
[13]RAKOSHDAS B.Pulses and radio-influence voltage of direct-voltage corona[J].IEEE Transactions on Power Apparatus&Systems,1964,83(5):483-491.
[14]GABOR D.Theory of communication,part 1:the analysis of information[J].Journal of the Institution of Electrical Engineers-PartⅢ:Radio and Communication Engineering,2010,93(26):429-441.
[15]TESTA A,GALLO D,LANGELLA R.On the processing of harmonics and interharmonics:using Hanning window in standard framework[J].IEEE Transactions on Power Delivery,2004,19(1):28-34.
[16]KRUG F,MUELLER D,RUSSER P.Signal processing strategies with the TDEMI measurement system[J].IEEE Transactions on Instrumentation&Measurement,2004,53(5):1402-1408.
[17]BRAUN S,KRUG F,RUSSER P.A novel automatic digital quasi-peak detector for a time domain measurement system[C]∥International symposium on Electromagnetic Compatibility.Silicon Valley,USA:IEEE,2004:919-924.
[18]KRUG F,RUSSER P.Quasi-peak detector model for a time-domain measurement system[J].IEEE Transactions on Electromagnetic Compatibility,2005,47(2):320-326.