Smart Grid Communications Ketan Rajawat IIT Kanpur Smart Microgrids
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Smart Grid Communications Ketan Rajawat IIT Kanpur Smart Microgrids “Building the smart grid.” The Economist [US] 6 June 2009: 16(US). Role of communications In-Home Displays DR signals from to Meter utility centres to meters Connect/Disconnect Conservation Voltage signal to meters Reduction SG Communication Applications Switches SCADA communicate with one other & central office Voltage regulators AMI communicate with one other & central office Network needs for diverse applications The bandwidth/latency/reliability requirements vary widely Electric Vehicle (>20Mbps): Distributed generation Asset monitoring Substation automation Distribution automation Grid monitoring Demand Response (250 kbps) AMI Smart Grid Applications Generation Transmission & Distribution (a) Reclosers Advanced Meters (b) Capacitor Banks (poles) (a) Residential Electric (c) SCADA (b) C&I Electric (d) Volt/VAR control (c) Gas meters (e) Energy storage (f) Outage management (g) Distributed Generation control (h) RTU Energy Efficiency and Demand Response (a) Thermostats (b) In-home displays (c) Load controllers (d) Consumer products (e) PHEVs Considerations Data Delivery Security Network Latency Criticality Provide different Secure information Supports varied levels of data storage and latency requirements delivery criticality transportation for messages depending on the billing purposes and communicated needs of the grid control between various application 6 6 points within the Avoidance of cyber smart grid Criticality levels attacks based on data loss Reliability Scalability Reliable for Scalability with the integration of successful and advanced web services, reliable timely exchange of protocols with advanced functionalities messages Facilitate operation of power grid Reliability affected 6 by time- out/network/resourc e failures Smart Grid Requirements Performance (a) BW: bps to Mbps (usage pattern of PHEVs) (b) latency: ms (demand resp for grid in distress) to sec (c) uptime: 90% to 99.9999% (d) Scalability: as many as 10 dev/home to millions of homes (mostly ignored earlier) (e) range: meters (NAN) to km (home to substation) Standards (a) Security: AMI-SEC, NERC CIP, NIST 800-53/800-82 (b) Application protocols: DNP3, IEC 60870/TASE; IEC 61850; IEC 61968; ANSI C12.19/C12.22; SEP; SNMP (c) Comm: Ipv4/6, ZigBee, HomePlug, 802.15.4 (d) Performance: IEEE1646 Future proof: Meters last 20-30 years. Electronics changes every 2-3 years. Interoperation? Ho QD, GaoY, Rajalingham G, Le-Ngoc T. Wireless Communications Networks for the Smart Grid. Springer; 2014 Sep 19. Traffic and Required QoSs Traffic Types Description Bandwidth Latency AMI Networks Meter Reads Meters report energy consumption (Ex: the 15-min interval reads Up to 10kbps 2 to 10sec are usually transferred every 4 hours) Demand Response (DR) Utilities to communicate with customer devices to allow customers Low 500ms ~ min to reduce or shift their power use during peak demand periods Connects and Disconnects Connects/disconnect customers to/from the grid Low A few 100ms, few min Substation Networks Synchrophasor The major primary measurement technologies deployed A few 100kbps 20ms to 200ms for Wide-Area Situational Awareness (WASA) Substation SCADA 4-sec interval polling by the master to all the intelligent 10 to 30kbps 2 ~ 4sec electronic devices inside the substation Inter-substation Emerging applications such as Distributed Energy Resources (DER) -- 12ms ~ 20ms Communications might warrant GOOSE communications outside substation Surveillance Video site surveillance A few Mbps A few sec Distribution Network Fault Location, Isolation and To control protection/restoration circuits 10 to 30kbps A few 100ms Restoration (FLIR) Optimization VOLT / VAR optimization and power quality optimization 2 ~ 5Mbps 25 ~ 100ms on distribution networks Workforce Access Provides expert video, voice access to field workers 250kbps 150ms Asset Management For predictively and pro-actively gathering and analyzing -- -- non-operational data for potential asset failures Microgid Protection To response to faults, isolate them and ensure loads -- 100ms ~ 10sec re not affected Operation Optimization Monitors and controls the operations of the whole MG in order to -- 100ms ~ min optimize the power exchanged between the MG and the main grid Communication requirements Applications Security Bandwidth Reliability Latency Advanced Metering High 14-100 kbps per 99.0-99.99% 2000 ms Infrastructure node AMI Network Management High 56-100 kbps 99.00% 1000-2000 ms Automated Feeder Switching High 9.6-56 kbps 99.0-99.99% 300-2000 ms Capacitor Bank Control Medium 9.6-100 kbps 96.0-99.00% 500-2000 ms Charging Plug-In Electric Medium 9.6-56 kbps 99.0-99.90% 2000 ms - 5 Vehicles min. Demand Response High 56 kbps 99.00% 2000 ms Direct Load Control High 14-100 kbps per 99.0-99.99% 2000 ms node Distributed Generation High 9.6-56 kbps 99.0-99.99% 300-2000 ms Distribution Asset High 56 kbps 99.00% 2000 ms Management Emergency Response Medium 45-250 kbps 99.99% 500 ms Fault Current Indicator Medium 9.6 kbps 99.00- 500-2000 ms 99.999% In-home Displays High 9.6-56 kbps 99.0-99.99% 300 -2000 ms Meter Data Management High 56 kbps 99.00% 2000 ms Source: M. Kuzlu, M. Pipattanasomporn and S. Rahman, "Communication network requirements for major smart grid applications in HAN, NAN and WAN", Computer Networks, vol. 67, pp. 74-88, 2014. Multi-Tiered Architecture Microgrid Smart Substation Substation Meter Customer Non-renewable Enegy Electric Vehicle Microgrid Wind Enegy Solar Enegy Power Generation Power Transmission Grid Power Distribution Grid Power Consumption (a) Power System Layer Wireless Backhaul Control Center Concentrator Smart Base Home Station Device Wired Backhaul Smart Network Meter Data Aggregation Point (DAP) Wide Area Network (WAN) Neighbor Area Network (NAN) Home Area Network (HAN) (b) Communications Layer The overall layered architecture of SG Mohammad S. Obaidat, Alagan Anpalagan, and Isaac Woungang. 2012. Handbook of Green Information and Communication Systems (1st ed.). Academic Press. High-Level Overview Example Example Members Technologies Retailers Internet Protocols Aggregators External World-Wide Web Regulators ebXML Customers IEC 60870-6 ICCP Providers Portal MDMS IEC 61970 CIS/Billing IEC 61968 Enterprise OMS Web Services WMS Multispeak EMS/DMS Message Buses Metering System SONET, WDM, ATM Routers MPLS Towers Frame Relay Ground Stations Satellite WAN Repeaters Microwave Rings IEC 61850 Collector DNP3 WiMAX Relays BPL / PLC Meter Modems Wireless Mesh Bridges ADSL LAN Access Points Cellular Insertion Points Meter Cable (DOCSIS) ZigBee Thermostats WiFi Normal NOR Critical PEND AMCATLI $ EPmroegrgraemncyO INVRGID PEemaekr gEevnecnyt VE- ! Stage 1 ER E Current Pool Pumps Stage 2 Temp 03/03/2007 Progr AW 8:48am am: AY LonWorks Stat us HAN Field Tools BACnet PCs HomePlug Building Automation OpenHAN Neighborhood Area Networks (NANs) Gathers a huge volume of various types of data and distributes important control signals from and to millions of devices installed at customer premises The most critical segment that connects utilities and customers in order to enable primarily important SG applications Characteristics of NAN To support a huge number of devices that distribute over large geographical areas Must be scalable to network size and self- configurable Heterogeneous and location-aware Link condition and thus network connectivity are time-varying due to multipath fading, surrounding environment, harsh weather, electricity power outage, etc. Characteristics of NAN Deployed outdoor, thus must be robust to node and link failures Carries different types of traffic that require a wide range of QoSs Needs QoS awareness and provisioning Mainly supports Multi-Point-to-Point (MP2P) and Point-to-Multiple-Point (P2MP) traffic Very vulnerable to privacy and security Home Area Network (HAN) Source: Mentor Graphics HAN Portal Options meter-as-portal: NAN connects to meter. meter connects to HAN (using wifi or zigbee), meter has 2 radios, since meter does not change, this is problematic: not future proof HAN-device-as-portal: deploy as you go, thermostat as gateway, device and meter need not be close togather, U-SNAP: usb for smart- grid devices, plug into thermostat, protocol- agnostic, multiple usnap on a gateway device multiple NANs at the same time Communication Technologies Wireless ◦ Zigbee (IEEE802.15.4) ◦ Z-wave (proprietary) ◦ WiFi (IEEE802.11) ◦ 3G cellular ◦ 4G: LTE/LTE-A ◦ 802.22 (white space) Wired ◦ Power Line Communications ◦ Fiber Optical Comm, Ethernet Challenges Wireless channels are ◦ Prone to interference (crowded bands) ◦ lower bandwidth than wired communication technologies ◦ Low penetration through concrete construction ◦ Limited Range ◦ Impact of power lines on wireless comm? IEEE802.15.4 Zigbee Zigbee is a short-range, low-data rate, energy- efficient wireless protocol Zigbee utilizes ◦ 16 channels in the 2.4GHz ISM band worldwide ◦ 13 channels in the 915MHz band in North America ◦ one channel in the 868MHz band in Europe ◦ It supports data rates of 250 kbps, 100kbps, 40 kbps, and 20 kbps ZigBee Smart Energy Profile (SEP) aims to support the needs of smart metering and AMI, and provide communication among utilities and household devices Zigbee pros and cons Low cost, inexpensive devices Self-organizing, secure, reliable, scalable Short range and does not penetrate structures, low data rate Deployment mainly in HANs Using 802.15.4 in NAN? 802.15.4 (ZigBee) in NAN: many benefits many