The design of monitoring communication system Based on Power line carrier

The design of the power line carrier communication system was introduced in this paper,DSP was adopted as the hardware platform to complete the core task.DSP sending terminal delivered the collecting data to the DSP receiving terminal through the power line carrier, and the DSP receiving terminal send the data to PC through a serial port.The design improved the power line carrier communication system and the data transmission became faster and more reliable.The experiment results showed that the PER of the receiving data is less than 0.4%, which satisfied the power line carrier communication requirement Our design is feasible and effective.

Performance Evaluation for Medium Voltage MIMO-OFDM Power Line Communication System

Power line communication(PLC)provides intelligent electrical functions such as power quality measurement,fault surveys,and remote control of electrical network.Most of research works have been done in low voltage(LV)scenario due to the fast development of in-home PLC.The aim of this paper is to evaluate the link-level performance of a medium voltage(MV)MIMO-OFDM communication system based on transmission link under underground power line channel.The MIMO channel is modeled as a modified multipath model in the presence of impulsive noise and background noise.We first perform a measurement on the practical MV MIMO channel parameters for a section of buried cable of 1 km long in Ganzhou city,Jiangxi province,China.Based on the measured channel,we design the frame structure based on an IEEE standard for broadband over power line networks[1]to support MV MIMO-OFDM transmission.According to designed frame structure,we design an encoder and a decoder for a dual binary tail-biting turbo code and optimize some key decoder parameters for low bit error rate performance.Finally,the link-level performance for both spatial multiplexing and spatial diversity are evaluated.Numeral results show that MV MIMO-OFDM is a promising approach to provide both high data rate and link reliability for PLC.

Modeling of OFDM Based Transceiver for Broadband Powerline Communication

In the recent past power line communication has emerged as an attractive choice for high speed data transfer and is looked upon as inexpensive and reliable media suitable for broadband internet access, home and office automation, in-vehicle data communication etc. In this paper we present an architecture for the physical layer of a PLC transceiver based on Orthogonal Frequency Division Multiplexing (OFDM) and the impact on multipath distortion for PLC transmission in terms of bit error rate. Since there is no standard PLC channel model available, a widely accepted multipath channel model is used for simulation purpose. Simulation results as well as FPGA synthesis verify the effectiveness of the proposed architecture for PLC modem design at 110 Mbps data rate.

WAVELET-BASED OFDM-CDMA HIGH SPEED POWER LINE COMMUNICATION SYSTEMS

This letter derives the Equivalent M-band Discrete Wavelet(EMDW) transmission mode of Orthogonal Frequency Division Multiplexing(OFDM) transmission systems, and presents a new Quadrature M-band Discrete Wavelet(QMDW) based OFDM-CDMA(Code Division Multiple Access) communication systems for high speed Power Line Communication (PLC) channels.This system gives much better robustness to Inter-Channel Interference (ICI), Multi-User Interference (MUI) and noise interference, which is verified by simulation.

Traffic Modeling of a Finite-Source Power Line Communication Network

Power line communication (PLC) is a promising smart grid application for information transmission using existing power lines. We analytically model a finite-source PLC network subject to channel failure through a queueing theoretic framework. The proposed PLC network model consists of a base station (BS), which is located at a transformer station and connected to the backbone communication networks, and a number of subscriber stations that are interconnected with each other and with the BS via the power line transmission medium. An orthogonal frequency division multiplexing based technique is assumed for forming the transmission channels in a frequency spectrum. The channels are subject to failure during service due to noise. We determine the steady-state solution of the proposed model and derive a set of performance metrics of interest. Numerical and simulation results are presented to provide further insights into the analytical results. The proposed modeling method is expected to be used for evaluation and design of future PLC networks.

Power Line Communications Networking Method Based on Hybrid Ant Colony and Genetic Algorithm

When solving the routing problem with traditional ant colony algorithm, there is scarce in initialize pheromone and a slow convergence and stagnation for the complex network topology and the time-varying characteristics of channel in power line carrier communication of low voltage distribution grid. The algorithm is easy to fall into premature and local optimization. Proposed an automatic network algorithm based on improved transmission delay and the load factor as the evaluation factors. With the requirements of QoS, a logical topology of power line communication network is established. By the experiment of MATLAB simulation, verify that the improved Dynamic hybrid ant colony genetic algorithm (DH_ACGA) algorithm has improved the communication performance, which solved the QoS routing problems of power communication to some extent.

Smart Home Networking: Lessons from Combining Wireless and Powerline Networking

Integrating the power grid technology with renewable power generation technologies, Demand Response (DR) programs enabled by the Advanced Metering Infrastructure (AMI) were introduced into the power grid in the interest of both utilities and residents. They help to achieve load balance and increase the grid reliability by encouraging residents to reduce their power usage during peak load periods in return for incentives. To automate this process, appliances, in-house sensors, and the AMI controller need to be networked together. In this paper, we compare mainstream network technologies applicable to home appliance control and propose a solution combining Power Line Communication (PLC) with wireless communication in smart homes for the purpose of energy saving. We extended NS-2, a popular network simulator, to model such combined network scenarios. Using a number of different routing strategies, we then model and evaluate the network performance of DR programs in smart homes in such a combined network.

Polar codes based OFDM-PLC systems in the presence of impulsive noise

Power line communication(PLC)has the potential to become the preferred technique for providing broadband communication to homes and offices with advantage of eliminating the need for new wiring infrastructure and reducing the cost.But it suffers from the impulsive noise because it introduces significant time variance into the power line channel.In this paper,a polar codes based orthogonal frequency division multiplexing(OFDM)PLC system is proposed to deal with the impulsive noise and thereby improve the transmission performance.Firstly,the impulsive noise is modelled with a multi-damped sine function by analyzing the time behavior of impulse events.Then the polar codes are used to combat the impulsive noise of PLC channel,and a low complexity bit-flipping decoding method based on CRC-aided successive cancellation list(CA-SCL)decoding algorithm is proposed.Simulations evaluate the proposed decoding algorithm and the results validate the suggested polar codes based OFDM-PLC scheme which can improve the BER performance of PLC with impulsive interference.

基于变步长匹配追踪的G3-PLC系统信道估计算法

为合理利用电力线信道的稀疏特性,提高G3-PLC系统通信的可靠性,基于压缩感知(compressed sensing,CS)理论,提出一种稀疏度自适应的变步长前向后向匹配追踪(sparsity adaptive variable step size forward-backward pursuit,SA-VSSFBP)算法。该算法在前向后向匹配追踪算法(forward-backward pursuit,FBP)的基础上引入变步长自适应的思想,于迭代初期选择大步长以减小迭代次数,迭代后期使用小步长获得精确估计。同时利用原子匹配度测试进行稀疏度预估计,确保逼近真实稀疏度的前提下,加快迭代速度,减少算法运行的时间。仿真实验结果表明,对比传统的信道估计方式,压缩感知信道估计方式具有更优越的性能,且相较于正交匹配追踪算法(orthogonal matching pursuit,OMP)与FBP的压缩感知信道估计算法,文章提出的算法能够在保证精度与步长为1的FBP相当的情况下算法效率分别能够提升24.14%和47.2%。

基于PLC技术的回流缆防盗割动态监测系统设计

回流缆防盗割监测是输电线路运维的重要内容,针对现有监测方法实时性差、误报率高等问题,提出一种基于电力线通信(Power Line Communication,PLC)技术的回流缆防盗割动态监测系统。该系统利用电力线载波通信技术实现监测数据的实时传输,并利用光纤应变和振动传感器对回流缆状态进行多参数监测,通过多传感器数据融合提高盗割识别准确率。测试结果表明,该系统能够准确检测各类盗割行为,具有较高的实时性和可靠性。

基于智能电表HPLC模块96点数据的配网低电压治理方法研究

在现代电力系统中,配网低电压问题常由多种因素引起,包括不平衡负荷、过长的供电距离或设备老化等。这些问题不仅影响电能质量,而且会降低用户满意度和电网运行效率。而智能电表的广泛部署为实时监控和管理配网提供了新的可能。文章深入探讨基于智能电表高速电力线载波(High-speed Power Line Carrier,HPLC)模块96点数据的配网低电压治理方法,根据自动识别和分类低电压问题,开发数据驱动的电压调节策略,并结合预测模型和预防措施,提出一套综合治理方案。然后,通过系统测试,验证所提方法的有效性和实用性。

智能电网应用中的PLC技术

智能电网已成为研究关注的热点、并代表未来电网的发展方向,信息与通信技术是其关键的促成因素,其中电力线通信(PLC)技术正发挥着愈来愈重要的作用。结合智能电网应用特点、以及近年来正交频分复用调制解调策略(OFDM)的发展,分析和阐述基于OFDM的高速窄带PLC技术,即PRIME与G3 PLC技术,包括其物理层与媒介访问控制层;同时考虑到PRIME与G3 PLC在互操作性方面的不足,论述了下一代新型窄带电力线通信技术G.hnem,包括其物理层G.9955与数据链路层G.9956;最后,总结得出相关结论。

低压PLC信道特性研究与新型调制解调算法探讨

本文对低压电力线载波通信信道特性进行了实验研究,重点测量和分析了低压电力线的阻抗特性、衰减特性和噪声特性。同时,针对低压电力线载波通信信道特点,提出了一种新的调制解调算法。仿真结果证明该算法同时对宽带噪声、窄带噪声和多径干扰具有较强的抑制能力。

基于PLC信道相关性的分集合并技术研究

研究电力线信道(power line channel,PLC)相关性对提高电力线通信系统的性能具有重要意义。基于电力线信道的多输入多输出(multiple input muliple output,MIMO)模型和信道本身的物理特性,可知电力线载波通信系统中信道间存在一定的相关性。详细分析了电力线信道单输入多输出(single input multiple output,SIMO)系统中子信道之间相关性及计算方式,同时也分析了电力线单输入多输出系统在分集合并技术下,采用二进制相移键控(binary phase shift keying,BPSK)调制方式时的最大比合并和等增益合并的系统误码率,比较了2种分集合并技术在不同的信道相关性下的误码率。通过仿真得出,相关性会影响分集合并的误码率,进而影响系统的性能。

中压配电网无功补偿装置对PLC信道特性的影响分析

分析中压配电网无功补偿装置对PLC信道特性影响规律,为实现PLC在中压配电网中的应用提供必要的理论基础和参考依据。通过对中压配电网现有无功补偿方式及常见补偿装置的分析,指明经配电变压器接入中压配电网的低压集中补偿和用户终端分散补偿的无功装置对中压侧PLC信道特性影响可忽略不计。故在中压配电网PLC信道模型基础上,重点分析变电站集中补偿和杆上无功分散补偿两种方式下,无功补偿装置的数量、补偿容量、补偿位置等因素对载波信号的传输特性和输入阻抗的影响规律。研究结果表明:若无功补偿装置直接接入补偿点,则电压衰减的幅度随着补偿容量、补偿点数量的增加而增大,与补偿位置基本无关;若无功补偿装置经一定长度的电缆接入补偿点,则以上各因素对电压衰落的影响可忽略不计。

跻身未来的电力线通信(三)PLC的基础调制及其改进

针对电力线通信 ( PLC)信道的特点 ,对多种基本数字调制技术提出了改进方案。其中 :对频移键控采取频点的自适应调整、陷波等措施 ,并给出了“软猫”设计方案 ;对正交幅度调制提出了采用格状编码调制技术 ( TCM)的改进措施 ,并进行了相关理论分析 ,以克服 PLC信道的噪声与衰减等不利因素 ,以及协调频带利用率与误码率之间的矛盾。

智能电网应用中的PLC最短路径及多径传输统计模型

智能电网代表未来电网的发展方向,电力线通信(PLC)技术在其中正发挥着愈来愈重要的作用。由于PLC网络存在阻抗不连续,引发多径传输,直接影响信号接收质量,多径传输特性是影响PLC通信性能优劣的关键因素,虽然之前对PLC多径传输已进行过广泛研究,但这些研究往往基于特定场合确定信息、特性已知情况下的分析,普适性不强,且未考虑多径传输中具有较少反射、较低衰减、并体现其主要特性的最短路径,本文通过构建结合最短路径的PLC多径传输统计模型,无需具体网络分析,旨在为PLC通信系统设计提供更加通用的参考。

基于VLC+PLC的电缆隧道通信及定位系统设计与开发

针对目前城市电缆隧道内存在照明不足、GPS信号差、电信信号、无线信号无法穿透等问题,提出以可见光通信技术(Visible Light Communication,VLC)与电力线载波通信技术(Power Line Communication,PLC)相结合的定位及通信系统设计方案。文章介绍了VLC的技术原理及特点,分析了VLC+PLC电缆隧道定位及通信系统的功能和关键技术,并进行了实际应用,该系统的应用提高了运检人员的工作效率,减少了工作隐患,具有进一步推广应用的价值。

基于PLCC技术的农业节水灌溉自动控制器的设计与应用

低压电力线载波通信技术在我国农业节水灌溉领域有着巨大的潜在利用价值。针对传统的农业节水灌溉自动控制系统中因常采用RS-485通信方式而带来的布线多、施工难和成本高的问题,提出了一个将电源线和信号线合二为一的新方案,设计了一个基于电力载波通信技术的农业节水灌溉自动控制器,能实现主机与终端器件之间的远距离通信,具有可同时收发、运行稳定、抗干扰性强、便于维护和扩展的特点。该控制器可以实现2 000 m距离内数据的高速可靠传输,传输速率达到5.5 kbps,能节省至少60%的田间电缆,能满足农业节水灌溉监测与控制的需求并能大大降低工程成本,因此该控制器在农业领域有着广阔的应用前景。

基于GPRS和PLC的10kV线路无功补偿系统设计

针对10kV线路补偿的特点制定了电压和无功功率多判据的电容投切补偿策略,提出了GPRS和电力线载波互相配合的无功补偿调度通信方式,设计了采用STM32系列嵌入式芯片的智能线路无功补偿终端。结果表明,该10kV线路无功补偿系统能够在确保可靠调度通信的同时更准确地补偿线路损耗。