Transcript
2017 International Conference on Electrical Engineering and Automation Control (ICEEAC 2017) ISBN: 978-1-60595-447-9
The Application of Packet Transport Network Technology Used in Power Communications of Smart Grid Bei-Bei QU1,a,*, Hua-Feng LI1,b, Rui-Bo ZHU1,c and Jian WU1,d 1
Information and Telecommunication Company of State Grid Shanxi Electric Power Company, Taiyuan 031000, China
a
[email protected],
[email protected],
[email protected], d809416003 @qq.com *Corresponding author
Keywords: Electric power communication, Packet transport network technology, Smart grid, Internet protocol.
Abstract. For smart grid based on Internet protocol (IP) data volumes increase, the traditional electric power communication network cannot meet the demand of the access problem, thus, the business of the packet transport network (PTN) technology was put forward to solve the point of view based on IP. This paper expounds the PTN key technology and its application in the smart grid, and puts forward and analyzes the PTN technology applied in the power communication model of smart grid finally. Introduction In recent years, due to the traditional power grid can't meet the increasing power system intelligent requirements, gradually began to the smart grid construction projects in our country [1, 2]. And smart grid information, automation, interaction characteristics manifests mainly depends on the level of electric power communication technology development, and the smart grid is becoming more and higher to the requirement of electric power communication network [3]. More than traditional electric power communication network based on time division multiplexing (time division multiplex, TDM) is the kernel of channel multiplexing technology step with digital series/transfer business platform (synchronous digital hierarchy/multi–service transport platform, SDH/MSTP) transmission system, it has restricted the electric power communication network to the information Internet protocol (IP) Internet Protocol, broadband networks, the direction of diversification. In order to solve this problem, based on the IP network packet transport network (PTN) packet transport network, gradually adopted by knowledge and technology, and has become the mainstream of the smart grid's new generation of electric power communication network transmission technology [4,5]. Summary of PTN Between PTN bottom light transmission medium and the IP business, is to solve the traditional SDH/MSTP transmission system can't very well solve the statistical multiplexing transmission and grouping of business flow of sudden faults is designed based on grouping, connection-oriented unified transmission technology of a new generation of more business, the group business as the core, and support a variety of two-way point-to-point connection channel based on the core, the network capacity is suitable for all kinds of size, end-to-end business, complied with intelligent network, IP and development trend of broadband networks and so on, is the Internet protocol/multi-protocol label switching (Internet Protocol/Multi - Protocol Label switching, IP/MPLS), transport network, and the combination of the three kinds of Ethernet technology. PTN provides in the service of IP business flexible transmission channel and the point-to-point connections. Among them, the protection of the point-to-point connection channel switch can be done 161
within 50 ms, has realized the transmission level business protection and recovery. Because it inherited the synchronous digital system (synchronous digital hierarchy, SDH) technology related operations, management and maintenance mechanism, with a point-to-point connection complete convenient network management work, including operation (operation), management (administration), d (maintenance), the three Jane said the OAM, so to ensure the network protection switch, error detection and channel monitoring ability. All of these make the in general use cost (total cost of ownership, TCO) lower at the same time, keep the optical transmission of high reliability, good extensibility and the traditional advantage of higher security, etc. It is because of these advantages, industry and information technology in July 2009 formally PTN approval on the new type of telecommunications equipment into the net [6]. Since 2010, Shandong electric power to the PTN after pilot, Anhui, Liaoning, Fujian, Shanghai and other provincial electric power company will PTN as the key point of construction in 2011. Key Technology of PTN PTN has the dual nature of grouping and transmission, and has gradually become a third-party mobile communications technology/long-term evolution (3rd generation / long term evolution, 3 G / LTE) age of IP mobile back net preferred solution [7]. The Whole Business Carrying Capacity PTN by using general packet switched core technology, adapt to the needs of business data. While 3G technology has developed rapidly, but in the longer term, the traditional TDM business will still be the main body of communication service, and the end-to-end pseudo line simulation technology well adapted to the main body, so the PTN will adopt this technology provides end-to-end, line level of transmission pipeline including the Ethernet adapter, asynchronous transmission module and TDM and other types of client business, in meet the demand of data service can also support the traditional circuit type business at the same time, this makes PTN comprehensive support for all types of business possible. QoS Technology In order to guarantee the reliability, the traditional SDH network provide exclusive rigid pipes to business, but business transport waste, such as the real-time demand higher voice business and ordinary Internet business, both to the network transmission requirements are distinct. PTN well solve the problem, it can sense the various features of the business, and provide the targeted QoS, so as to realize to each according to his need. Packet Interleaving Technology PTN to transmit data, circuit and optical layer, and other functions into one, realizes the packet cross connection and statistical multiplexing of various business. PTN use unified general exchange platform, simplifies the network, to solve the integration between the multiple business platforms. By business exchange with the business process, make the whole business access and hosting, operators can also according to the different needs of the business capacity of flexible configuration of business. Hierarchical OAM and Protection Technology As with SDH, PTN operational management through to the section of the layer, such as tunnel, pseudo wire layer provides hierarchical alarm and performance management to support hierarchical OAM. At the same time, through the OAM mechanism of rapid and timely fault detection, also can make the PTN has access link protection levels, network protection and equipment protection into full play.
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Application Requirement of PTN Technology in Smart Grid In the smart grid, consider a connection-oriented and extensibility, manageability, may become the PTN candidate technologies have transfer protocol label exchange and operator backbone transmission technology. Among them, T - MPLS is based on MPLS, connection-oriented. Compared with MPLS, T - MPLS technology does not support the connectionless mode, implement the MPLS on simple, easy to operation and management. In addition, the T - MPLS removed the MPLS features related to the third layer and IP routing, making it equipment to better meet the operators of the next generation of low cost, large capacity packet network demand, development trend and become the most likely. When in networking with PTN equipment, considering the characteristic of electric power communication network, can use a layered structure. To regional network as an example, it can divided into access layer, link layer and backbone layer 3. Among them, the access layer can be used in a dual node access star topology. Convergence layer can be used in a dual node ring structure, in order to prevent the convergence layer nodes and the backbone nodes of single node failure risk. The backbone layer via gigabit Ethernet or Wan Zhao Ethernet link connected directly related convergence layer nodes. In addition, each backbone room are 2 sets of large PTN equipment configuration, which is responsible for the computer business equipment port normal access and scheduling of the business, share the safety. At present, the electricity production scheduling network my business has more than on TDM business projects, business network is complementary characteristics. Considering the trend of the evolution of the network and power grid in quite long period of time will depend on the characteristics of TDM, construction of PTN electric power communication network cannot be achieved overnight, should according to the present situation and development trend of power grid construction, gradually from the sdh-based MSTP network in the direction of the evolution of SDH mixed with PTN and finally form the PTN network independently. This process can be roughly divided into three periods: a) The construction of the early. According to when the former business transmission Platform (Multi - Service Transfer Platform, MSTP) network architecture, building since adapt to the new business requirements. During this period, the access layer will be one of the few IP business request access, PTN equipment, introduced in the access layer, with the mixture formation of SDH ring network of SDH equipment, to meet the wan interface E1, fast Ethernet interface FE and other business access requirements. In the hybrid network model, the network of PTN equipment at the same time have the function of SDH, limiting and weaken the network's ability to transfer IP business, lead to can't play to the advantages of the kernel IP of PTN. During this period, you can through the construction practice of PTN network to explore, get rich project construction practice, equipment operation and maintenance management experience. b) The middle of construction. With the further advance of the smart grid construction project, the IP business access request to exponential growth, in part of the business more developed can form only by the PTN build GE ring. In order to satisfy certain focal point under GE ring access to the business requirements and relevant convergence layer node can be replaced by direct MSTP PTN or gradually transformed MSTP into two ways PTN equipment and make the class node also has the capability of GE's access to the ring. c) Late construction, also is the PTN independent group net mature stage. During this period, all kinds of business information, such as voice, data, images, implements the whole surface of IP, all packet transport network convergence layer and access layer of PTN equipment construction. After this stage, maintenance work got a simplified network management, operation maintenance costs have been greatly compression, network input-output ratio increased significantly. Conclusion With the PTN technology matures, the smart grid of PTN technology in electric power communication transmission of data intelligent is the trend of The Times. The use of the technology is 163
not only to satisfy the growing IP access requirements of the business, also promoted the electric power communication comprehensive upgrade, so that the smart grid in the real-time, interactive, the electric power communication reliability index improved significantly, save the electric power communication run maintenance cost, and will bring the future smart grid greater economic and social benefits. References [1] Liu Ping-xin, Song Jie, Xie Ni-na. Application of PTN and carrier-class ethernet in power communication system. Telecommunications for electric power system, 31(211): 25-31. (2010) [2] Sheng Qian-sheng, Zhang Gui-ying. Key Technologies and Advantages of PTN [J].Information Technology, (12):202-205. (2010) [3] Zheng Wen-bin.Study on Application of PTN Technology in Power Transmission Networks [J].Telecommunication Technology, (4):47-50. (2010) [4] Zhu Jing, Liu Zhao-wei, Lei Xue-yi, et al. PTN-Evolution and Reformation of Information and Communication Trans-port Networks. Power System Communication, 30 (198):52-59. (2009) [5] Zhang Hong-bin. Discussion on PTN Technology and the Application. Telecommunication Science, 24(6):6-10. (2008) [6] Sun Yazhou, Wang Long. SDH design and implementation of communication mode in power system [J]. China New Telecommunications, (7): 28-30. (2010) [7] Zhou Jing, Liu Guirong, Zhao Ziyan, et al. Research and simulation on the resource optimization for the power communication backbone network. Optical Communication Technology, (2): 34-36. (2011)
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