Communication Challenges for the FREEDM system

Performance Evaluation;WiFi;Zigbee;DNP3;IEC61850;Smart Grids;FREEDM

Khanna, Mohit ; Dr Wenye Wang, Committee Chair,Dr. Subhashish Bhattacharya , Committee Member,Dr. Alex Dean, Committee Member,Khanna, Mohit ; Dr Wenye Wang ; Committee Chair ; Dr. Subhashish Bhattacharya ; Committee Member ; Dr. Alex Dean ; Committee Member

University:North Carolina State University

关键词: Performance Evaluation;    WiFi;    Zigbee;    DNP3;    IEC61850;    Smart Grids;    FREEDM;   

Others  :  https://repository.lib.ncsu.edu/bitstream/handle/1840.16/1456/etd.pdf?sequence=1&isAllowed=y

美国|英语

来源: null

【 摘 要 】

The Future Renewable Electrical Energy Distribution and Management (FREEDM)Center's proposal to incorporate the renewable resources of energy as source of electricityinto the existing power distribution system and allow for energy exchange between individ-ual sites, is a revolutionary idea which will help us meet the energy needs of the future in anenvironment friendly manner. The renewable resources of energy have certain characteris-tics which make such an integration very challenging. They are available in large amountsbut not concentrated at an area and are intermittent in nature. Thus a lot of them needto be deployed along with storage resources in order to obtain a steady source of electricityresulting in a distributed energy generation environment. To maintain the stability of suchan electricity distribution grid, it is essential to monitor and control each site from a centrallocation using agents. These agents also need to communicate with each other to executeany protection scheme or for energy management to utilize any excess electricity at a site.Therefore, a reliable communication backbone becomes an essential platform which wouldallow such a communication to take place. Since FREEDM is intrinsically a complex sys-tem, the communication backbone must be a fault-tolerant in that distributed devices andelements may become faulty or fail.In this thesis, we investigate the challenges for such a communication backbonein a distributed energy generation and energy exchange environment within an electricitydistribution system. We use the FREEDM system as a platform for our research. To ourknowledge, a power system proposed by the FREEDM, does not exist, which makes our jobmore challenging. We need to identify the various communicating entities, communicationscenarios and their timing requirements within the FREEDM system and propose a com-munication architecture which meets these criteria. We also need to identify the possiblecommunication protocol standards which will be used for message exchange.In order to understand the communication needs of power system applicationswhich would be used in the FREEDM system, we conduct a survey of the existing powersystem communication architectures (the SCADA and substation automation systems) andcommunication protocols (DNP3 and IEC 61850). Further we detail the various levels2of communication and communicating entities within the FREEDM system. We apply ourunderstanding of existing substation automation systems to the FREEDM system and iden-tify the timing criticality and communication requirements for power system applicationswithin the FREEDM system. In order to quantify the timing requirements and to iden-tify the various networking technologies which will be used to support the communicationbackbone of the FREEDM system, we set up a distributed communication testbed usingZigBee, WiFi and Ethernet communication technologies. A Web, SNMP{based monitoringtool set up by us, as a means to keep track of the distributed devices forming the testbed isalso presented. We conclude the thesis by presenting the results of experiments performedby us on the testbed and presenting a road-map for our future work.This thesis, presents our ¯rst year e®orts towards setting up of a communicationbackbone for the FREEDM system and identifying the communication challenges. Thereliability and security aspect of the communication backbone, will be taken up in ourfuture work. Our preliminary results have provided a fundamental platform to study uniquechallenges in the future design and development of a reliable and secure FREEDM system.