1、翻译部分英文原文A Survey of Communication Network Paradigmsfor Substation AutomationHyoSik Yang；Dept. of Computer Engineering；Sejong University, Seoul, KoreaEmail: hsyangsejong.ac.krDaejun； Korea Electrical Power Research Institute ；ByungSeok Park；Korea Email: blueonkepri.re.krAbstractIn the realm of substa
2、tion automation (SA), communication infrastructure plays a vital role in mediating between physical and virtual worlds of substation. Specification of data exchanges through standardized communication stacks is therefore an important issue for all substation equipment manufacturers seeking to provid
3、e vendor interoperability. Nowadays competitive electric utility marketplace, reliable and realtime informationbecome the key factor for reliable delivery of power to the endusers, profitability of the electric utility and customer satisfaction.The operational and commercial demands of electric util
4、ities require a highperformance data communication network that supports both existing functionalities and future operational requirements. As communication arena is changing day by day,the need for efficient and reliable communication infrastructure to address SA is evident. In this respect, a comm
5、unication network constitutes the core of the SA, thus the design of costeffective and reliable network architecture is a crucial task. Most of the existing communication networks claim to address the need of communication architecture for SA but in some regard these claims just could not fulfill th
6、e constraints imposed by highly available environment for SA. This paper presents a survey and analysis of the current state-of-the-art communication infrastructure in the SA. As Ethernet technology becomes more reliable and also widely available with fiber optical communication so this paper also e
7、xamines the key issues and requirements for Ethernet in the substation environment and also opens some research challenges.I. INTRODUCTIONSubstation Automation (SA) is a supervisory management and control system that lies in between transmission and distribution systems. The interests on SA have bee
8、n increasing rapidly due to its numerous benefits to utilities. It has advanced further than a traditional Supervisory Control and Data Acquisition (SCADA) system providing additional capability and information that can be used to further improve operations, maintenance and efficiencies in substatio
9、ns. The most significant elements of a SA system include relays and/or Intelligent Electronic Devices (IEDs) that perform various control, monitoring and protection related operations.Recent developments in communication technologies have enabled reliable remote control systems which have the capabi
10、lity of monitoring the real time operating conditions and performance of electric systems. These communication technologies can be classified into four classes, i.e., power line communication, satellite communication, wireless communication, and optical fiber communication. Each communication techno
11、logy has its own advantages and disadvantages that must be evaluated to determine the best communication infrastructure for SA.Power line communication (PLC) utilizes the existing infrastructure of electricity for communication thereby offering a broad coverage as well as cost effective solution but
12、 on the other hand suffered by noise, capacity, signal distortion and security issues 1.Whenever it comes to remote monitoring, satellite communication is opted as one of the available mean to achieve it 2. Though satellite communication offers global coverage and rapid installation but performance
13、stills the problem with unavoidable delay.Optical fiber communication has taken the major share of communication due to its high capacity and immunity characteristics for EMI/RFI (Electro Magnetic Interference / Radio Frequency Interference). Though cost of deploying fiber optic communication is exp
14、ensive but it is overcome by the advantages offered.Wireless communication due to its rapid deployment and cost effective solution has dramatically change the trend of communication paradigm but still need to address the crucial issues of capacity, security, and coverage in order to make it viable.I
15、n this paper, it is investigated that which communication architecture is feasible for SA. In this regard existing com munication technologies such as power line communication, satellite communication, optical fiber communication, wireless communication are explored to search for the best available
16、communication infrastructure.The rest of this paper is organized as follows. Section II presents the current state-of-the-art communication infrastructure in the SA and also present analysis on them with respect to SA. Section III presents suggested communication architecture for SA and also proposes a future direction for research. Finally, Section IV summarizes the contribution of this paper.II. STATE OF THE ART COMMUNICATION NETWORKIn thi
