DESIGN OF COMMUNICATION NETWORK ARCHITECTURE FOR THE SMART GRID

Open Access
Author:
Kim, Myongsoo
Graduate Program:
Computer Science and Engineering
Degree:
Doctor of Philosophy
Document Type:
Dissertation
Date of Defense:
May 16, 2011
Committee Members:
  • John Metzner, Dissertation Advisor
  • John Metzner, Committee Chair
  • George Kesidis, Committee Member
  • Sencun Zhu, Committee Member
  • Tao Yao, Committee Member
Keywords:
  • Smart Grid
  • Communication Network
  • Utility Security
  • Key Exchange
  • One core ring network
Abstract:
Power systems have been dramatically changing with cutting edge information technologies. The new power system infrastructure called Smart Grid has evolved and has been studied by many institutes and companies. The Smart Grid is bound up with customer side activities such as Distributed Generators (DGs). Changes in the power system structure, changes in requirements and the necessity to have easy access to accurate data have led to the need for communication systems. Due to these changes, communication systems with Intelligent Electronic Devices (IEDs) in power companies expose the safety-critical power companies’ network to the multitude of security problems in communication networks. Moreover, obsolescent control systems for power systems are evolving into intelligent systems and connecting with smart devices to give intelligence to the power systems. As networks of the control system are growing, vulnerability is also increasing. The communication network of distribution areas in the power system connects closely to vulnerable environments. Many cyber attacks have been founded in the power system, and they could be more critical as the power system becomes more intelligent. In this dissertation, an independent and hierarchical communication network architecture for Smart Grid is designed by information hiding and suppressing data exchange. The function of self-healing and resist attack will be easily implemented by this proposed network. First of all, communication bandwidth and topology is considered corresponding to the advent of DGs. Availability is also considered when it comes to design a communication network for power systems because power systems should provide seamless service. New network architecture of optical network using one core is also proposed for the distribution area in power systems to increase reliability. Additionally, a mitigation operation algorithm using device-level intelligence is suggested if servers are compromised by cyber-attacks. To give security to the network, Multiple channel Secure Acknowledging Multicast (MSAM) is applied to the power systems, which merges the tasks of acknowledgment and key changes in a simple and direct manner to make exposed IEDs more secure in distribution areas in the Smart Grid.