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Communication Technologies for Smart Grid: A Comprehensive Survey
Fredrik Ege Abrahamsen, Yun Ai, Michael Cheffena
TL;DR
Smart grids require fast, reliable, secure, and bidirectional communications as distributed energy, storage, electric vehicles, and data exchange expand. This paper surveys smart-grid communication requirements, technologies, architectures, applications, and security challenges. It concludes that communication enables evolving grid functions, while security concerns must be addressed to maintain reliable power supply.
Problem
Growing smart-grid complexity and bidirectional information exchange require communication systems that meet differing requirements for reliability, coverage, efficiency, security, and cost.
Method
The paper provides a comprehensive survey of smart-grid communication requirements, physical-layer technologies, network structures, applications, and security challenges.
Results
The survey presents an overview of smart-grid infrastructure, communication technologies and requirements, and applications across premises, neighborhood, and wide-area networks.
Takeaways & Limitations
Communication is central to emerging smart-grid capabilities, but security concerns must be addressed to ensure reliable power supply.
Takeaways & Limitations
PLC channel characteristics differ significantly across environments, producing variable performance and sometimes requiring other technologies to bypass transformers or extend coverage.
Abstract
from arXiv · showhide
With the ongoing trends in the energy sector such as vehicular electrification and renewable energy, smart grid is clearly playing a more and more important role in the electric power system industry. One essential feature of the smart grid is the information flow over the high-speed, reliable and secure data communication network in order to manage the complex power systems effectively and intelligently. Smart grids utilize bidirectional communication to function where traditional power grids mainly only use one-way communication. The communication requirements and suitable technique differ depending on the specific environment and scenario. In this paper, we provide a comprehensive and up-to-date survey on the communication technologies used in the smart grid, including the communication requirements, physical layer technologies, network architectures, and research challenges. This survey aims to help the readers identify the potential research problems in the continued research on the topic of smart grid communications.
1. Introduction
Traditional power grids rely mainly on centralized generation, radial infrastructure, excessive capacity, and one-way power flow, while changing demand, distributed renewables, and storage motivate smarter infrastructure. Smart meters add frequent consumption reporting and enable customer participation, monitoring, control, and fault detection.
- Traditional grids are primarily radial systems built for centralized generation, excessive capacity, and one-way power flow from plants to consumers.
- Rising electricity demand, aging conventional infrastructure, distributed renewable energy, and storage systems motivate the transition toward smart grids.
- Smart meters can collect and report consumption data several times per hour instead of relying on monthly manual reporting.
- Smart metering enables consumers to feed electricity from sources such as solar panels or electric vehicles into the grid.
- Smart metering also supports greater grid monitoring and control, automatic fault detection, and fault reporting.
2. Overview of Smart Grid
Smart grids are organized around bidirectional information exchange across domains, layers, networks, and applications to support reliable, efficient, and secure power generation and distribution. Their infrastructure includes communication-enabled metering, monitoring, automation, distributed resources, and customer-facing systems.
- Smart Grid Infrastructure: Communication supports measurements, monitoring, management, and control across smart-grid domains, enabling reliable, efficient, and secure power generation, transmission, and distribution.
- Smart Grid Domains: The NIST framework structures smart grids into domains connected through electrical and communication interfaces, including markets, operations, service providers, generation, transmission, and distribution.
- Smart Grid Domains: Reliable communication is required between domains, while the European architecture model additionally organizes smart-grid systems by interoperability layers, domains, and zones.
- Smart Grid Infrastructure: Smart-grid infrastructure is commonly described through application, communication, power-control, and power-system layers supporting automation, pricing, monitoring, and management applications.
- Smart Grid Applications: Advanced metering infrastructure combines smart meters, sensors, monitoring systems, software, data-management systems, and communication networks to collect, analyze, and store metering data.
- Smart Grid Applications: Smart-meter connections may use RS-485, cellular networks, Ethernet, fiber optics, PLC, or HAN interfaces, depending on the metering architecture.
- Smart Grid Applications: Grid monitoring through SCADA and wireless sensor nodes improves fault identification, troubleshooting time, resource optimization, and reliability.
- Smart Grid Applications: Two-way AMI communication allows end users to sell surplus distributed energy back to the power grid.
Distributed storage
Distributed storage, electric vehicles, demand response, and home energy management extend smart-grid flexibility at the load end. These applications depend on fast, reliable communication and enable monitoring, control, energy exchange, and demand adjustment.
- Distributed storage: Distributed storage supports fast responses to grid stability issues when reliable communication links are available.
- Distributed storage: Combining distributed storage with distributed energy resources can improve utilization of renewable distributed energy resources.
- Vehicle to grid (V2G): Vehicle-to-grid networks exchange power between electric-vehicle batteries and the grid, including feeding stored energy back when necessary.
- Demand response (DR): Demand response lets consumers or utilities adjust demand in predefined situations, including shifting consumption toward off-peak hours under dynamic pricing.
- Home energy management systems (HEMS): Home energy management systems combine appliances, sensors, meters, and displays to monitor, control, and manage consumption and support demand-response applications.
3. Smart Grid Communication
Smart-grid communication connects growing sensor and application data across network layers, with technologies selected to meet differing QoS, data-rate, coverage, and reliability requirements.
- Increasing sensor deployment increases the amount of data reaching utilities and creates varied application QoS requirements.
- QoS Requirements: Control, management, automation, demand-response, and substation-automation applications require low latency and high reliability, whereas meter readings tolerate higher latency but still require high reliability.
- Communication Requirements: Communication technologies must support the distinct data-rate and coverage-distance requirements of each smart-grid network type.
- Network Types: WANs form the backbone connecting substations, control systems, protection equipment, and distributed networks to utility control centers.
- Network Types: NANs and FANs connect premise networks with WANs and support information flow for distribution services such as monitoring, control, and demand response.
Premise area network
Smart-grid premises and communication networks use combinations of wired and wireless technologies chosen according to environment, topology, technical requirements, operational needs, and cost.
- Premise Area Networks: Premise-area networks include HANs, BANs, and IANs serving residential, commercial, and industrial environments.
- Technology Selection: Communication technologies must be selected case by case because wireless options reduce installation cost and reach inaccessible areas, while wired links avoid some interference issues.
- Wired Communication: PLC reuses power-line infrastructure and supports data rates from up to 10–500 Kbps for narrowband PLC to up to 300 Mbps for broadband PLC.
- Wired Communication: PLC channel characteristics vary significantly across environments, motivating hybrid combinations with RF or visible-light communication to extend coverage.
- Wired Communication: Fiber optics provide long range, high bandwidth, and resistance to electromagnetic disturbances for WAN backbone and substation connectivity, but have limited access points and higher cost.
- Wireless Communication: Cellular systems offer existing coverage and low cost for applications such as rural smart meters, but shared networks can experience congestion.
- Wireless Communication: WiMAX, ZigBee, Z-Wave, WiFi, satellite, and FSO address different smart-grid settings, ranging from short-range premises links to rural or high-bandwidth connectivity.
4. Challenges of smart grid communication
Smart-grid communication faces requirements for robust, secure, and privacy-preserving information exchange as interconnected devices and communication paths expand.
- Communication Challenges: Robust information transmission with high QoS is prioritized to support system robustness and reliability across the grid.
- Cybersecurity: Cybersecurity must address deliberate attacks and inadvertent accidents affecting communication, automation, and power-system operation.
- Privacy and Data Protection: Norwegian guidance emphasizes confidentiality, integrity, and availability, including protection against unauthorized access, retrieval, tampering, and unavailability of measurement data.
- Cybersecurity: Smart-grid cyber-attacks can cause data loss, loss of communication control, compromised integrity, and power loss.
- Security Measures: Encryption of communications between grid devices and data centers helps limit attackers’ ability to access data or achieve system control.
- Security Measures: Authentication, authorization, and access control are necessary because smart grids contain many connected devices and users with different roles.
- Privacy: Smart-meter data can reveal household presence, absence, appliance use, and energy-consumption patterns, creating significant privacy risks.
5. Conclusion
The survey reviews smart-grid infrastructure, communication technologies, requirements, applications, and cybersecurity challenges, concluding that rising information exchange makes security essential to reliable power supply.
- The paper surveys smart-grid infrastructure, communication technologies, requirements, and applications across premise, neighborhood, and wide-area networks.
- It briefly presents cybersecurity challenges and identifies security as necessary for reliable power supply as information exchange increases.