【摘要】：隨著智能電網(wǎng)進程的加快,電力通信網(wǎng)絡(luò)服務(wù)面臨從SDH技術(shù)向IP分組技術(shù)的升級。大顆粒、多類型網(wǎng)絡(luò)業(yè)務(wù)的出現(xiàn),迫使以時分復(fù)用為核心的電力通信傳輸網(wǎng)向統(tǒng)計復(fù)用進行轉(zhuǎn)變,這就為PTN技術(shù)提供了廣闊的應(yīng)用前景。通常情況,繼電保護和安全穩(wěn)定控制等電力系統(tǒng)實時性業(yè)務(wù)采用時分復(fù)用技術(shù)來構(gòu)建傳輸通道,此類業(yè)務(wù)對時延的要求極高,這對傳輸通道的可靠性和實時性提出了挑戰(zhàn)。PTN承載此類實時性業(yè)務(wù)需要具備充分的理論支持和充足的仿真數(shù)據(jù)支撐。以往對于PTN網(wǎng)絡(luò)實時性業(yè)務(wù)傳輸時延的研究,大多以網(wǎng)絡(luò)測試為主,較少出現(xiàn)的理論研究也沒有考慮傳輸時延的隨機性問題和時延抖動問題。本文采取數(shù)值仿真的方法,深入研究了實時性業(yè)務(wù)的傳輸時延問題。建立了PTN分組傳輸?shù)碾S機時延模型,該模型可以表示隨機傳輸時延概率分布,并可以研究分組封裝尺寸對傳輸時延特性的影響。提出了隨機封裝和固定封裝兩種分組封裝模式,分別建立了單節(jié)點和串聯(lián)路徑端到端時延抖動數(shù)學(xué)模型。定量研究了背景流量、網(wǎng)絡(luò)節(jié)點數(shù)量、路由器吞吐量等參數(shù)對時延抖動的影響程度,對比分析了兩種封裝模式的優(yōu)缺點。為了驗證時延抖動數(shù)學(xué)模型的正確性,編程實現(xiàn)了時延抖動模型的蒙特卡羅仿真。數(shù)值仿真結(jié)果表明,隨著分組封裝尺寸的不斷增加,隨機傳輸時延概率呈現(xiàn)快速增長的趨勢。背景流量對隨機封裝模式影響較大,對固定封裝模式影響很小。節(jié)點數(shù)量的增多會顯著增大時延抖動。時延抖動隨路由器吞吐量的增加而減小。在網(wǎng)絡(luò)參數(shù)均相同的條件下,固定封裝模式的時延抖動值更小。蒙特卡羅仿真驗證了時延抖動模型的正確性。采用非結(jié)構(gòu)化封裝的實時性業(yè)務(wù),當(dāng)封裝數(shù)量處于16~32區(qū)間時,具有良好的時延特性。通過控制傳輸通道參數(shù),能夠有效減少時延抖動,從而為宿邊緣路由器去抖動設(shè)置提供依據(jù)。在絕大多數(shù)情況下,固定封裝比隨機封裝擁有更好的穩(wěn)定性和抗時延抖動能力。本課題的研究成果為PTN承載TDM業(yè)務(wù)提供了理論支持,在改善電力通信實時性業(yè)務(wù)傳輸時延方面具有一定的技術(shù)指導(dǎo)意義和工程參考價值。
[Abstract]:With the acceleration of smart grid process, power communication network services are facing upgrading from SDH technology to IP packet technology. The emergence of large particle and multi-type network services forces the power communication transmission network with time division multiplexing as the core to change to statistical multiplexing which provides a broad application prospect for PTN technology. In general, the real-time services of power system such as relay protection, safety and stability control adopt time-division multiplexing technology to construct transmission channels, which require very high time delay. It is a challenge to the reliability and real-time of the transmission channel, and it is necessary for PTN to carry such real-time services with sufficient theoretical support and sufficient simulation data support. In the past, most of the researches on the real-time transmission delay of PTN network mainly focused on network testing, and the few theoretical studies did not consider the randomness of transmission delay and the problem of delay jitter. In this paper, the transmission delay of real-time traffic is studied by numerical simulation. The random delay model of PTN packet transmission is established. The model can represent the probability distribution of random transmission delay and study the effect of packet package size on transmission delay characteristics. Two packet encapsulation modes, random package and fixed package, are proposed, and the mathematical models of end-to-end delay jitter of single node and series path are established respectively. The influence of background traffic, number of network nodes and router throughput on delay jitter is quantitatively studied, and the advantages and disadvantages of the two encapsulation modes are compared and analyzed. In order to verify the correctness of the delay jitter mathematical model, Monte Carlo simulation of the delay jitter model is programmed. The numerical simulation results show that the probability of random transmission delay increases rapidly with the increasing of packet package size. Background flow has a great influence on random packaging mode, but little effect on fixed packaging mode. The increase in the number of nodes will significantly increase the delay jitter. Delay jitter decreases with the increase of router throughput. When the network parameters are the same, the delay jitter of fixed encapsulation mode is smaller. Monte Carlo simulation verifies the correctness of the delay jitter model. The real-time service with unstructured encapsulation has good delay characteristics when the number of packages is in the range of 16 ~ 32. By controlling the transmission channel parameters, the delay jitter can be effectively reduced, thus providing the basis for setting up the dejitter of the host edge router. In most cases, the fixed package has better stability and resistance to delay jitter than random packaging. The research results of this paper provide theoretical support for PTN carrying TDM services, and have certain technical guiding significance and engineering reference value in improving the transmission delay of real-time power communication services.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN915.853;TM73

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