DPLC Channel Design Issues
In this chapter, designing of digital PLC channels including consistent solution of a certain set of tasks which ultimately would allow ensuring reliability of the communication channel is discussed. Main topic relates to selection of appropriate frequenc
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DPLC Channel Design Issues
5.1 Main Tasks of the DPLC Channel Designing When designing DPLC channels, the following issues should be addressed: 1. Collection of data on number, types, and properties of information signals to be transmitted via the DPLC channel 2. Selection of DPLC equipment depending on properties of the set of transmitted signals, such as IP traffic 3. Defining necessary parameters of DPLC equipment modems. These include information bit rate, bandwidth, transmission delay, and so on 4. Collection of data on power lines where the DPLC channel or channels are planned to be created 5. Selection of optimal scheme for coupling to power lines 6. Analysis of the climate map for power line location area 7. Calculations of HF path attenuation without IHRD 8. Calculation of noise level in the band of the DPLC equipment receiver 9. Calculation of IHRD effect on attenuation and noise of the HF path 10. Calculation of HF path parameters under various climatic and operating conditions of the power line 11. Calculation of the PLC channel attenuation and selection of the PLC channel upper frequency limit considering IHRD, to ensure specified reliability of the PLC channel Normative and technical documents used in the designing DPLC channels are listed in Chap. 1; also IEC 60870-5-101 [1] and IEC 60870-5-104 [2] standards should be followed. When solving DPLC channel design tasks, we will constantly refer to the information provided earlier in the previous chapters.
© The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG 2021 A. G. Merkulov et al., High Voltage Digital Power Line Carrier Channels, https://doi.org/10.1007/978-3-030-58365-1_5
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5 DPLC Channel Design Issues
5.2 Types and Characteristics of DPLC Information Traffic Every industry has its own requirements for transmitting process control information. In the eclectic power industry, several types of information with different priorities are transmitted between substations and dispatch center. In Table 5.1, data on the type of transmitted information, its priority, and type of the electric grid units interaction during the information transmission are given. Let us analyze features of each signal: • Dispatcher voice channels (DispVoice) are used for operational dispatch management of electric grid. • Technological voice channels (TechVoice) are used by the company’s departments for various purpose works.
Table 5.1 Characteristics of information signals transmitted via digital DPLC channels Information signal/designation Dispatching voice communication/(Disp.Voice)
Data transmission from telecontrol system (TC)
Data transmission from power meters (PM)
Technological voice communication/(Tech.Voice)
Other data services: e-mail, SNMP management, Internet/file transfer (AUX) DC dispatch center, SS substation
a
Priority Characteristics High Is used by dispatcher services for voice communications between DC and SS Interaction: DC ←→ SSa Force connection/dial connection. Protocol stac
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