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数字化变电站专用EPON通信网络传输特性研究

发布时间:2018-09-14 17:44  文章来源:笔耕文化传播
【摘要】:本文针对基于IEC61850标准的数字化变电站通信网络进行了研究,提出了一种基于IPACT算法的数字化变电站专用EPON通信系统,通过该专用通信系统组建过程层网络,实现GOOSE报文和SV报文的发送。经过理论分析计算和实际测试,该EPON系统可满足IEC61850标准中的过程层通信网络要求。首先研究基于IEC61850标准的数字化变电站结构体系与数据报文。IEC61850标准将数字化变电分为变电站层、间隔层和过程层3层架构。变电站层和间隔层之间为站控层网络,间隔层和过程层之间为过程层网络。这两张网根据所传输的数据类型可划分成多张逻辑网络。IEC61850标准定义了7类数据报文。这7类数据报文通过4种映射服务映射到MAC层,然后由不同的网络传输。网络必须满足IEC61850规定的数据报文高实时性和可靠性的要求。鉴于SV网络和GOOSE网络是实时性要求最高的网络,本文主要针对SV网络和GOOSE网络开展研究。接着重点研究EPON技术的MPCP多点控制协议和经典IPACT上行动态带宽分配算法。MPCP协议的5种控制帧在ONU注册过程和上行带宽分配中起重要的作用。对IPACT算法研究发现ONU的注册时间与上行带宽分配中的轮询周期对数据的传输时延影响很大。考虑到在EPON多业务传输时的QoS服务质量,还针对802.1p、802.1Q协议以及基于优先级的调度算法对EPON传输时延的影响加以讨论。最后对EPON网络进行研究,研究结果表明EPON网络可以适用于组建数字化变电站通信网。EPON网络结构符合数字化变电站对通信网络拓扑的要求。根据数字化变电站的分层架构,站控层网络和过程层网络可以单独组网,由间隔层隔离这两张网络,也可唯一组网,从而简化间隔层设备和网络结构,使变电站设备可共享同一网络上的数据。通过分析和对比这两种组网方式,以及对比星型、环型拓扑的优缺点,同时考虑EPON网络结构的特点和数字化变电站未来发展的方向,提出变电站通信网按星型拓扑结构组成唯一网络,在唯一网络上由VLAN划分为SV网络和GOOSE网络。由于公网EPON系统无法满足IEC61850的要求,因此根据数字化变电站内短距离通信的应用环境对EPON进行改进。主要采用限制RTT时间、OLT对ONU的最大授权带宽等方法缩短IPACT算法的轮询周期,进而在基于该IPACT算法的EPON系统中关闭发现过程使ONU至ONU传输时延进一步缩短到SV和GOOSE报文的传输要求。理论计算出ONU至ONU传输时延的范围后对专用EPON进行测试。实测结果表明该EPON系统可以满足变电站SV网络和GOOSE网络的传输要求。
[Abstract]:In this paper, the communication network of digital substation based on IEC61850 standard is studied, and a special EPON communication system for digital substation based on IPACT algorithm is proposed. Through this special communication system, a process layer network is established to realize the sending of GOOSE and SV messages. It can satisfy the requirement of process layer communication network in IEC 61850 standard. First, the structure system and data message of digital substation based on IEC 61850 standard are studied. These two networks can be divided into several logical networks according to the data types transmitted. The IEC 61850 standard defines seven types of data packets. These seven types of data packets are mapped to the MAC layer through four mapping services and then transmitted by different networks. The network must satisfy the requirements of high real-time and reliability of data packets specified in IEC 61850. Since SV network and GOOSE network are the most demanding real-time networks, this paper mainly focuses on SV network and GOOSE network. Then it focuses on MPCP multi-point control protocol of EPON technology and classical IPACT uplink dynamic bandwidth allocation algorithm. The five control frames of MPCP protocol play an important role in ONU registration process and uplink bandwidth allocation. The research of IPACT algorithm shows that the registration time of ONU and the polling period in uplink bandwidth allocation have great influence on the data transmission delay. Considering the QoS quality of EPON multi-service transmission, we also discuss the impact of 802.1p, 802.1Q protocol and priority-based scheduling algorithm on the transmission delay of EPON. The research results show that EPON network can be used to construct digital substation communication network. EPON network structure meets the requirements of digital substation communication network topology. By analyzing and comparing the advantages and disadvantages of the two networking modes, and comparing the advantages and disadvantages of star topology and ring topology, and considering the characteristics of EPON network structure and the future development direction of digital substation, the substation communication network is proposed. The VLAN is divided into SV network and GOOSE network according to the star topology. Because the public network EPON system can not meet the requirements of IEC61850, the EPON is improved according to the application environment of short-distance communication in digital substation. The main methods are to limit RTT time and the maximum authorized bandwidth of ONU by OLT. Shorten the polling period of IPACT algorithm, and then turn off the discovery process in EPON system based on IPACT algorithm to further shorten the transmission delay between ONU and ONU to the transmission requirements of SV and GOOSE messages. Transmission requirements of network and GOOSE network.
【学位授予单位】:南京理工大学
【学位级别】:硕士
【学位授予年份】:2014
【分类号】:TM63;TM73


本文编号:2243420


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