混合电力线路高频保护信号衰减计算方法
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摘要
针对由多个传输介质组成的混合电力线路上高频保护信号衰减严重的情况,采用均匀传输线理论和传递矩阵法给出了混合电力线路信号衰减计算方法。结合由架空线路和埋地电缆组成的徐州220kV任贺线高频保护的信号衰减情况,分析了不同因素对单一介质线路上信号衰减的影响,并计算了任贺线混合电力线路的衰减曲线随频率的变化关系,结果表明其衰减特性随频率呈振荡变化趋势,混合电力线路的衰减最大值远大于同一长度的单一介质类型线路。通过试验测量了任贺线双回线上55kH z～200k Hz的载波信号衰减曲线,测量结果与理论计算结果基本一致,验证了计算的正确性。根据计算结果指导了高频保护的工作频率选取,更换频率后信号衰减显著降低。研究内容对分析混合电力线路的高频载波通信具有重要应用价值。
Aiming at the problem that high frequency protection signal transmission has serious attenuation on hybrid power lines composed of multiple media, a method for calculating the signal attenuation on hybrid power lines is proposed, using the theory of uniform transmission line and transfer matrix method. Based on signal attenuation of high frequency protection of 220 kV Renhe Line in Xuzhou, Jiangsu, composed of overhead lines and buried cables, the influencing factors on signal attenuation in single medium are simulated and analyzed, and the changing relationship between Renhe hybrid line signal attenuation curve and frequency is calculated. Results show that the attenuation characteristics are oscillating with frequency, and the maximum attenuation for hybrid power lines is far greater than that for single medium line of the same length. The attenuation curves of 55 kHz～200 kHz carrier signal on Renhe double circuit line are measured by experiment, and the results basically coincide with theoretical calculation results, verifying correctness of the calculation. Based on the calculation results, the working frequency of high frequency protection is selected and the signal attenuation is significantly reduced after replacement of frequency. The researches in this paper have significant application value for analyzing the high frequency carrier communication of hybrid power lines.
Aiming at the problem that high frequency protection signal transmission has serious attenuation on hybrid power lines composed of multiple media, a method for calculating the signal attenuation on hybrid power lines is proposed, using the theory of uniform transmission line and transfer matrix method. Based on signal attenuation of high frequency protection of 220 kV Renhe Line in Xuzhou, Jiangsu, composed of overhead lines and buried cables, the influencing factors on signal attenuation in single medium are simulated and analyzed, and the changing relationship between Renhe hybrid line signal attenuation curve and frequency is calculated. Results show that the attenuation characteristics are oscillating with frequency, and the maximum attenuation for hybrid power lines is far greater than that for single medium line of the same length. The attenuation curves of 55 kHz～200 kHz carrier signal on Renhe double circuit line are measured by experiment, and the results basically coincide with theoretical calculation results, verifying correctness of the calculation. Based on the calculation results, the working frequency of high frequency protection is selected and the signal attenuation is significantly reduced after replacement of frequency. The researches in this paper have significant application value for analyzing the high frequency carrier communication of hybrid power lines.
引文
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[21]朱永强,贾利虎,谢文超,等.一种用于单相/三相变换的新型电力电子变换技术[J].电工技术学报,2018,33(7):1433-1439.Zhu Yongqiang,Jia Lihu,Xie Wenchao,et al.A new power electronic transformation technology for single-phase/three-phase[J].Transactions of China Electrotechnical Society,2018,33(7):1433-1439(in Chinese).
[2]解超,李凤婷,王彦鹏,等.基于高频信号的输电线路主动式保护[J].电力系统保护与控制,2017,45(7):6-12.Xie Chao,Li Fengting,Wang Yanpeng,et al.An active protection of transmission line based on high-frequency signal[J].Power System Protection and Control,2017,45(7):6-12(in Chinese).
[3]计策,张艳霞,杨钢.相差高频保护中操作元件比相动作判据的研究[J].电网技术,2006,30(4):55-59.Ji Ce,Zhang Yanxia,Yang Gang.Study of phase comparison criterion of operating component in phase differential high frequency protection[J].Power System Technology,2006,30(4):55-59(in Chinese).
[4]王义伟.电力线载波通信系统噪声衰减方法研究[D].北京:华北电力大学,2016.
[5]杨挺,刘佳林,张亚健,等.电力线载波通信时频混合降噪方法[J].电网技术,2018,42(10):3153-3160.Yang Ting,Liu Jialin,Zhang Yajian,et al.Noise reduction method for LV power line carrier communication[J].Power System Technology,2018,42(10):3153-3160(in Chinese).
[6]So P,Ma Y.Development of a test bed for power line communications[J].IEEE Transactions on Consumer Electronics,2004,50(4):1174-1182.
[7]James L,Zhang J,David J,et al.Causal RLGC(f)models for transmission lines from measured S-parameters[J].IEEE Transactions on Electronic Compatibility,2010,52(1):189-198.
[8]Luis G,Pablo F,Carlos M.Power line communication transfer function computation in real network configurations for performance analysis applications[J].IET Communications,2017,11(6):897-904.
[9]Gassara H,Rouissi F,Ghazel A.Statistical characterization of the indoor low-voltage narrowband power line communication channel[J].IEEE Transactions on Electromagnetic Compatibility,2014,56(1):123-131.
[10]向敏,文超,文成亮.基于IPv6的电力线载波通信分片独立的重传机制[J].电网技术,2015,39(1):169-175.Xiang Min,Wen Chao,Wen Chengliang.An IPv6 based fragmentation independent retransmission mechanism for power line communication[J].Power System Technology,2015,39(1):169-175(in Chinese).
[11]胡正伟,谢荣圆,谢志远.基于QoS参数的电力线信道状态映射方法[J].电力自动化设备,2016,36(10):159-165.Hu Zhengwei,Xie Rongyuan,Xie Zhiyuan.Mapping of PLC channel status to QoS parameter[J].Electric Power Automation Equipment,2016,36(10):159-165(in Chinese).
[12]王艳,王东,赵洪山.基于支路追加法的配电网混联线路电力线载波通信信道建模[J].电力系统自动化,2016,40(23):56-60.Wang Yan,Wang Dong,Zhao Hongshan.Power line carrier communication channel modeling of hybrid lines distribution network based on branch-adding method[J].Automation of Electric Power Systems,2016,40(23):56-60(in Chinese).
[13]卢文冰,张慧,赵雄文,等.网络参数对低压宽带电力线信道的影响[J].电工技术学报,2016,31(1):221-229.Lu Wenbing,Zhang Hui,Zhao Xiongwen.Effect of network parameters for low-voltage broadband power line channels[J].Transactions of China Electrotechnical Society,2016,31(1):221-229(in Chinese).
[14]高强,臧丽炜,马平.城市中压地埋电缆宽带通信的研究[J].电网技术,2014,38(10):2833-2838.Gao Qiang,Zang Liwei,Ma Ping.Research on broadband communication through phase conductor and shielding layer of urban medium-voltage buried cables[J].Power System Technology,2014,38(10):2833-2838(in Chinese).
[15]Javier M,Sila K,Sadit A,et al.Simulation of low-voltage narrowband power line communication networks to propagate open ADRsignals[J].Journal of Communications and Networks,2015,17(6):656-664.
[16]罗汉武,蔡伟,乐健.电力线载波通信信道特性的影响因素分析[J].电力系统保护与控制,2013,41(7):73-78.Luo Hanwu,Cai Wei,Le Jian.Analysis of influence factors on power-line communication channel characteristics[J].Power System Protection and Control,2013,41(7):73-78(in Chinese).
[17]Wu X,Zhu B,Rong Y.Channel model proposal for indoor relay assisted power line communications[J].IET Communications,2018,12(10):1236-1244.
[18]曹旺斌,尹成群,谢志远,等.宽带MIMO-PLC随机参数信道建模与特性[J].电网技术,2017,41(3):1029-1034.Cao Wangbin,Yin Chengqun,Xie Zhiyuan,et al.Modeling and analysis of broadband MIMO-PLC random parameter channels[J].Power System Technology,2017,41(3):1029-1034(in Chinese).
[19]李丰.低压电力线载波通信信道阻抗和衰减特性的研究[D].北京:华北电力大学,2012.
[20]肖勇,房莹,张捷,等.低压电力线载波通信信道特性研究[J].电力系统保护与控制,2012,40(20):20-25.Xiao Yong,Fang Ying,Zhang Jie,et al.Research on characteristics of low voltage power line communication channel[J].Power System Protection and Control,2012,40(20):20-25(in Chinese).
[21]朱永强,贾利虎,谢文超,等.一种用于单相/三相变换的新型电力电子变换技术[J].电工技术学报,2018,33(7):1433-1439.Zhu Yongqiang,Jia Lihu,Xie Wenchao,et al.A new power electronic transformation technology for single-phase/three-phase[J].Transactions of China Electrotechnical Society,2018,33(7):1433-1439(in Chinese).