宽带电力线通信信道特性及网管技术研究
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摘要
宽带电力线通信是宽带接入的一个新的方向,其技术研究和应用成为目前国内外研究的热点问题之一,有着深远的理论意义和广泛的实用价值。本文基于我国的电网特性和结构,分析了宽带电力线接入时存在的问题及宽带电力线正交频分多路复用调制技术的优化方法;计算和分析了宽带电力线通信信号是否会对电能质量产生影响;首次完成了国内中压宽带电力线通信信道的测试实验;建立了适合我国中压宽带电力线通信信道的噪声模型和衰减模型;基于计算机网络和通信的最新技术,提出了适合我国宽带电力线通信的新型网络管理模型和策略;研究了宽带电力线通信网络管理信息模型和设备管理问题,主要工作如下:
分析了目前宽带电力线通信技术对电能质量和电气设备的影响,并针对电力系统中的十一种电能质量扰动,计算和分析得出了宽带电力线通信载波信号不会对电力系统的电能质量构成威胁的结论,并且也不会对连接于电力输配电网的电气设备造成明显的影响。
分析了宽带电力线通信技术中所涉及到的各种调制技术的特点、性能,使用多尺度正交小波基替代OFDM中余弦函数的思想对OFDM系统进行优化设计,该设计方法可明显提高OFDM性能,克服OFDM的不足,增强OFDM的综合抗干扰能力。对OFDM技术进行仿真,研究避免多径衰落方法、实验验证了插入保护间隔可以消除码间干扰和多径造成的子载波间干扰的影响。
首次完成了我国中压宽带电力线通信信道的测试实验,测试内容为中压宽带电力线通信信道阻抗特性、噪声特性、衰减特性和通信性能,给出了反应中压宽带电力线通信信道特性的测试结果并进行了分析。
分析和讨论了中压宽带电力线通信信道特性数学模型的方法,建立了符合我国中压宽带电力线通信信道特性和实际情况的传输模型,该建模方式可以很好地模拟中压宽带电力线通信信道上的背景噪声的时域和频域特性。
提出了将Web技术与移动Agent相结合的宽带电力线通信网络管理模型和策略。并且从数据流量和响应时间两方面比较了传统的SNMP的网络管理与基于移动Agent的宽带电力线通信网络管理两种模式的特性,分析和验证了该模型在性能方面的优越性,结果表明该模型设计的可行性。
设计了宽带电力线通信网络管理的信息库(BPMIB)、构建了MIB的信息模型。并给出了宽带电力线通信接入的应用实例。
Broadband PLC (Power Line Communication), as a new broadband accesstechnology, has becoming one of the hottest discussing problems recently. The researchon the PLC technology and application has profound practical value and theoreticalsense. Based on characteristics and structure of our countries power grid, the followingtechnical problems was discussed, such as the problem of broadband PLC access, theoptimization of OFDM (Orthogonal Frequency Division Multiplexing) and thebroadband PLC signal's influence on power quality etc. In addition, the test of mediumvoltage power line channel is finished for the first time, as well as the creation for themodel of medium voltage power line channel noise and attenuation. On the base of thenew technology of computer network and communication, a new broadband PLCnetwork management model and strategy is presented, in the meantime the broadbandPLC network management information model is designed and the problem of networkdevices management is discussed too.
The influence of broadband PLC technology on the power quality and electricequipments is analyzed. For the 11 kinds of power quality perturbation, we computedand analyzed that if the broadband PLC signal has some influence on the power quality.At last we draw a conclusion that the broadband PLC carrier signal has no apparentinfluence on the power quality, as well as the electric equipments of electric powersystem.Based on the wavelet transform technique and OFDM modulation technique, aswell as the comparison of the characteristics and performance between modulationtechniques involved in the broadband power line communication, a techniquesubstituting multi-scale orthogonal wavelet for cosine function in OFDM for theoptimization design of system is proposed. This method can obviously improve theperformance of OFDM, overcome the deficiency of OFDM and enforce the syntheticanti-jamming capability of OFDM. In addition, by the emulation of OFDM technique, itproved that using the time internal could reduce both the ISI and the ICI, which seems tohave much meaning for the designs of the communication system.
The medium voltage power line channel test is performed for the first time inour country. The impedance characteristics, noise characteristics, attenuation characteristicsand communication performance of medium voltage power line communication channel aretested, and the test data, test result and result analysis are presented.
The methods of build the mathematical model of medium voltage power linechannel characteristic are discussed, and the transmission model is created based on thecharacteristics of medium voltage power line and practical cases. This modeling methodcan emulate the time domain characteristics and frequency domain characteristics ofbackground noise effectively.Based on the combination of Web technology and Mobile agent technology, abroadband PLC network management model and strategy is presented. In the meanwhile,the comparison between the conventional SNMP network management and mobile agentbased broadband PLC network management is made, form the two aspects throughputand response time. The conclusion proves that this model has good performance and thenetwork management strategy is feasible.The MIB and its information model of broadband PLC network management aredesigned. At last, the application cases of broadband PLC are given.
分析了目前宽带电力线通信技术对电能质量和电气设备的影响,并针对电力系统中的十一种电能质量扰动,计算和分析得出了宽带电力线通信载波信号不会对电力系统的电能质量构成威胁的结论,并且也不会对连接于电力输配电网的电气设备造成明显的影响。
分析了宽带电力线通信技术中所涉及到的各种调制技术的特点、性能,使用多尺度正交小波基替代OFDM中余弦函数的思想对OFDM系统进行优化设计,该设计方法可明显提高OFDM性能,克服OFDM的不足,增强OFDM的综合抗干扰能力。对OFDM技术进行仿真,研究避免多径衰落方法、实验验证了插入保护间隔可以消除码间干扰和多径造成的子载波间干扰的影响。
首次完成了我国中压宽带电力线通信信道的测试实验,测试内容为中压宽带电力线通信信道阻抗特性、噪声特性、衰减特性和通信性能,给出了反应中压宽带电力线通信信道特性的测试结果并进行了分析。
分析和讨论了中压宽带电力线通信信道特性数学模型的方法,建立了符合我国中压宽带电力线通信信道特性和实际情况的传输模型,该建模方式可以很好地模拟中压宽带电力线通信信道上的背景噪声的时域和频域特性。
提出了将Web技术与移动Agent相结合的宽带电力线通信网络管理模型和策略。并且从数据流量和响应时间两方面比较了传统的SNMP的网络管理与基于移动Agent的宽带电力线通信网络管理两种模式的特性,分析和验证了该模型在性能方面的优越性,结果表明该模型设计的可行性。
设计了宽带电力线通信网络管理的信息库(BPMIB)、构建了MIB的信息模型。并给出了宽带电力线通信接入的应用实例。
Broadband PLC (Power Line Communication), as a new broadband accesstechnology, has becoming one of the hottest discussing problems recently. The researchon the PLC technology and application has profound practical value and theoreticalsense. Based on characteristics and structure of our countries power grid, the followingtechnical problems was discussed, such as the problem of broadband PLC access, theoptimization of OFDM (Orthogonal Frequency Division Multiplexing) and thebroadband PLC signal's influence on power quality etc. In addition, the test of mediumvoltage power line channel is finished for the first time, as well as the creation for themodel of medium voltage power line channel noise and attenuation. On the base of thenew technology of computer network and communication, a new broadband PLCnetwork management model and strategy is presented, in the meantime the broadbandPLC network management information model is designed and the problem of networkdevices management is discussed too.
The influence of broadband PLC technology on the power quality and electricequipments is analyzed. For the 11 kinds of power quality perturbation, we computedand analyzed that if the broadband PLC signal has some influence on the power quality.At last we draw a conclusion that the broadband PLC carrier signal has no apparentinfluence on the power quality, as well as the electric equipments of electric powersystem.Based on the wavelet transform technique and OFDM modulation technique, aswell as the comparison of the characteristics and performance between modulationtechniques involved in the broadband power line communication, a techniquesubstituting multi-scale orthogonal wavelet for cosine function in OFDM for theoptimization design of system is proposed. This method can obviously improve theperformance of OFDM, overcome the deficiency of OFDM and enforce the syntheticanti-jamming capability of OFDM. In addition, by the emulation of OFDM technique, itproved that using the time internal could reduce both the ISI and the ICI, which seems tohave much meaning for the designs of the communication system.
The medium voltage power line channel test is performed for the first time inour country. The impedance characteristics, noise characteristics, attenuation characteristicsand communication performance of medium voltage power line communication channel aretested, and the test data, test result and result analysis are presented.
The methods of build the mathematical model of medium voltage power linechannel characteristic are discussed, and the transmission model is created based on thecharacteristics of medium voltage power line and practical cases. This modeling methodcan emulate the time domain characteristics and frequency domain characteristics ofbackground noise effectively.Based on the combination of Web technology and Mobile agent technology, abroadband PLC network management model and strategy is presented. In the meanwhile,the comparison between the conventional SNMP network management and mobile agentbased broadband PLC network management is made, form the two aspects throughputand response time. The conclusion proves that this model has good performance and thenetwork management strategy is feasible.The MIB and its information model of broadband PLC network management aredesigned. At last, the application cases of broadband PLC are given.
引文
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