Mega's comprehensive access solution based on industrial Ethernet platform

With the successful application of optical communication technology, network switching technology, and microelectronics technology in the IT industry, the power communication network service is no longer the initial narrowband service such as voice communication and transmission of real-time monitoring signals for power grid dispatching, but has gradually developed to simultaneously carry access to multiple services such as power grid dispatching automation, power marketing automation, distribution network automation, substation relay protection automation, office automation, video surveillance and video conferencing, IP telephone and other data transmission.

Characteristics of power communication

The business of power communication can be divided into two categories: key operation business and business management business. Key operation business refers to telecontrol signals, data acquisition and monitoring control systems, energy management systems, relay protection signals and dispatching telephones, etc.; the amount of information in key operation business is not large, but the real-time, accuracy, security and reliability of communication are very high; it is an independent information system that requires separation from other businesses and does not cross-integrate with other businesses; business management business includes administrative telephones, conference phones and conference televisions, management information data, etc. Business management business is a business with many types of business, fast changes, large communication traffic, and must be transmitted by broadband.

Since the end of the 20th century, network-based information technology applications have always led the innovation wave of the information revolution. At the same time, information technology has now become an important driving factor for global economic development. The "information-driven industry development" strategy is the correct development direction for the power industry in this innovation. [page]

Power IT applications involve data, voice and video. Different types of applications have different characteristics and require different network environments. For example, the administrative telephone, dispatch telephone and call center of the power industry are real-time voice applications that require low latency and low jitter. The power DAS (dispatching automation system) and relay protection signals are network systems that require high reliability. The power OA (office automation) is a data application that has no strict requirements for latency and jitter, but has high requirements for packet loss and bit error rate, so it requires broadband network support. However, due to cost considerations and management reasons, we do not have to build different networks for different applications, especially as more new applications will continue to emerge. This method is not scalable and is not suitable for the development of IT applications in the power industry. Therefore, the power industry needs to build an integrated network that can provide good service support and scalability; and will not cause a decline in various system indicators due to a comprehensive network. The two major businesses can be separated at the terminal equipment layer, so it also meets the requirements of the State Power Corporation to separate the dispatching and administrative networks.

The transmission platform is the most basic infrastructure of power IT applications, and determines the scalability of the power communication network. Therefore, the transmission platform must have sufficient scalability to support more and more power network IT applications; in addition, as the basis of power communication, the transmission platform must also be able to provide the highest reliability; and from a long-term perspective, the selected transmission platform technology must be the most economical.

In the power industry, it is an indisputable fact that most applications will be based on the network in the near future. Considering the future ISP (Internet Service Provider) applications, transmission technology is very critical. No one can predict how much bandwidth it will need in the future. Looking at the development of the network, broadband network is the current development trend, because Moore's Law can no longer adapt to the growth of optical network capacity, and more and more network applications require more bandwidth.

The State Grid Corporation of China attaches great importance to the development of IP in the power industry and has put the plan to develop IP technology in the power industry on the important agenda; according to the State Grid Science and Technology [2003] No. 285 document, the "State Grid Corporation of China (2003-2005-2010) Science and Technology Development Plan" clearly puts forward the description of the promotion and application of IP technology in power enterprises; in the 2005 goal, it is proposed: "Build a national power dispatching data network based on the IP technology system to achieve effective isolation of application systems with different security levels; the data network coverage rate of power grid dispatching application systems in various regions across the country will reach more than 85%." In "Key Technologies for Power System Communication", it is proposed to "Study IP network application technology. Study the planning, networking and security mechanism of IP networks, and develop Layer 2 and Layer 3 switches that meet the requirements of the power system, have high reliability and good performance-price ratio. Establish an international protocol telephone (VOIP) business support and management system based on the H.323 international standard system.

Research multimedia technology based on IP data streams to achieve distance education, online training, video conferencing, and real-time data transmission technology; conduct research on IP network applications based on power line carrier (PLC) digital communities, power supply load management and quality analysis, and power consumption information collection. "

In summary, we believe that it is very necessary for the power system to build a broadband information communication network based on optical switching technology (IP). [page]

IP data communication and traditional communication

Due to the rapid development of modern information science and technology, from the emergence of the world's first computer network in the early 1990s to the widespread application of computers today, the high-speed processing of CPU chips, the popularization and extension of the Internet, the trend of information networking development has become more and more prominent and significant. It has become an indisputable fact today. The unification and networking of enterprise production and operation, the digitalization of enterprise data information management and administrative management all require enterprises to achieve fast and efficient goals through network interconnection, so as to help enterprises improve their competitiveness and create greater economic benefits; IP technology is a basic technology for realizing the networking development of various information services, improving network transmission efficiency and multimedia needs; IP technology suitable for the requirements of networking development has become the foundation and direction of future information processing.

If an SDH synchronous digital network is established, it is not conducive to the transmission of sudden services because it is a circuit-type device, and the precious bandwidth resources cannot be fully utilized; in addition, the cost of establishing a network of the same scale is higher than that of an IP network. The following is a comparison of the relevant indicators of the two networks:

Comparison table of IP network and Synchronous Digital Hierarchy (SDH) network

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Investment Analysis of Building Networks Using IP Products

Investment analysis: From the above comparison indicators, we can see that the basic transmission indicators are similar. When the network range is within a region, the transmission indicators are not much different; but the construction costs are quite different between the two. As shown in the following figure:

The unit construction cost of the SDH network is higher as the PCM equipment increases in pairs. On the contrary, since the topology of the IP network can be point-to-multipoint, when the number of substation equipment increases, the cost of the main station equipment is shared. In addition, the price of IP products themselves is relatively low, so the unit construction cost of the IP system is significantly lower than that of the SDH network.

The integrated communication access platform for industrial Ethernet switching developed by Shanghai Zhaoyue Communication Technology Co., Ltd. can effectively carry the transmission of power operation services and business services, and can fully meet the requirements of information broadband and multi-business development. It is a product with very broad prospects and in line with the direction of informatization development.

The system uses industrial Ethernet products to form a network transmission platform, and can directly access various transactional services to complete the transmission of telecontrol data, power distribution data, relay protection data, etc.

IP services have become the main business of the power system, covering various data such as telecontrol, protection, electricity, MIS, etc. of the power system, so the integrated communication platform based on industrial Ethernet will become the main mode of power communication in the future.