【摘要】：近年來,隨著傳感技術(shù)、通信技術(shù)、控制技術(shù)等的快速發(fā)展,智能電網(wǎng)系統(tǒng)也成為研究與開發(fā)的熱點(diǎn)。由于各個(gè)電力設(shè)備、電力傳感器使用電力線進(jìn)行連接,電力線通信(Power Line Communication,PLC)成為智能電網(wǎng)中經(jīng)濟(jì)、實(shí)用的通信方式。然而,電力線通信存在多徑效應(yīng)、信號(hào)衰減和脈沖噪聲干擾等問題,這導(dǎo)致了電力線通信信道容量小,平均傳輸速率低以及通信可靠性差等問題。本文圍繞如何提高智能電網(wǎng)中電力線通信性能這一中心,開展一系列研究,并取得如下成果:(1)為了提高電力線通信系統(tǒng)中,通信的可靠性與容量,提出在多區(qū)域協(xié)作環(huán)境中,建立了 PLC的多輸入多輸出(Multiple Input Multiple Output,MIMO)通信模型。并在此模型基礎(chǔ)上,設(shè)計(jì)了電力線最優(yōu)發(fā)射節(jié)點(diǎn)的選擇技術(shù),并分析了這種技術(shù)下的系統(tǒng)性能。仿真結(jié)果表明,在多區(qū)域和多節(jié)點(diǎn)情況下采用發(fā)射分集思想可以有效提高系統(tǒng)的信道容量。(2)為了提高終端用戶下載數(shù)據(jù)的速率、系統(tǒng)能耗,提出在電力線系統(tǒng)中引入緩存機(jī)制。在對(duì)多節(jié)點(diǎn)協(xié)作區(qū)域中,設(shè)計(jì)了具有緩存結(jié)構(gòu)的多個(gè)中繼節(jié)點(diǎn)以聯(lián)合傳輸形式為區(qū)域邊緣用戶提供數(shù)據(jù)服務(wù)的模型。以整個(gè)系統(tǒng)總功耗最小化為目標(biāo)建立了仿真系統(tǒng),分析了節(jié)點(diǎn)能耗和回程鏈路能耗。仿真結(jié)果表明了緩存機(jī)制的引入可以很大程度上節(jié)約系統(tǒng)能量。(3)在智能家庭電力線拓?fù)浣Y(jié)構(gòu)的基礎(chǔ)上,設(shè)計(jì)了一種基于OFDM機(jī)制的子信道分配算法。與其它信道分配算法相比,本課題設(shè)計(jì)的算法能充分考慮網(wǎng)絡(luò)拓?fù)�、干擾和流量公平約束等限制條件。仿真表明,該算法在提高系統(tǒng)總吞吐量和保證網(wǎng)絡(luò)用戶公平性上有更好的表現(xiàn)。
[Abstract]:In recent years, with the rapid development of sensing technology, communication technology and control technology, smart grid system has become a research and development hotspot. Power Line Communication PLC (PLC) has become an economical and practical communication mode in smart grid because of the connection of power sensor with power line. However, there are many problems in power line communication, such as multipath effect, signal attenuation and impulse noise interference, which lead to low capacity of power line communication channel, low average transmission rate and poor communication reliability. In order to improve the reliability and capacity of power line communication in power line communication system, this paper focuses on how to improve the performance of power line communication in smart grid, and obtains the following results: (1) in order to improve the reliability and capacity of power line communication system, a multi-area cooperative environment is proposed. The multiple input multiple output MIMO (MIMO) communication model of PLC is established. On the basis of this model, the selection technology of the optimal power line transmitting node is designed, and the system performance under this technology is analyzed. The simulation results show that the channel capacity of the system can be improved effectively by using transmit diversity in multi-area and multi-node cases. (2) in order to improve the data download rate of the end users and the energy consumption of the system, a buffer mechanism is proposed in the power line system. In the multi-node cooperative region, a model of multiple relay nodes with buffer structure is designed to provide data service to the users at the edge of the region in the form of joint transmission. Aiming at minimizing the total power consumption of the whole system, the simulation system is established, and the node energy consumption and the backhaul link energy consumption are analyzed. Simulation results show that the introduction of buffer mechanism can save the system energy to a great extent. (3) based on the intelligent home power line topology, a sub-channel allocation algorithm based on OFDM mechanism is designed. Compared with other channel allocation algorithms, the proposed algorithm can fully consider the network topology, interference and traffic fairness constraints. Simulation results show that the proposed algorithm can improve the total throughput of the system and ensure the fairness of network users.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM73

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本文編號(hào)：2127292