Security analysis of interconnected AC/DC systems

Robert Eriksson

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


This paper analyses N-1 security in an interconnected ac/dc transmission system using power transfer distribution factors (PTDFs). In the case of a dc converter outage the power needs to be redistributed among the remaining converter to maintain power balance and operation of the dc grid. The redistribution of power has a sudden effect on the power-flow in the interconnected ac system. This may cause overloading of lines and transformers resulting in disconnection of equipment, and as a consequence cascading failure. The PTDF is used as a method to analyze and avoid violating limits by in the dc voltage control design consider the power distribution for a converter outage. By proper design and utilizing the proposed method increases the N-1 security and the secure transfer limits. This article proposes a method which minimizes the 2-norm of the sum of the PTDFs with constraints of not violating any line or transformer limits. Simulations were performed in a model of the Nordic power system where a dc grid is placed on top. The simulation supports the method as a tool to consider transfer limits in the grid to avoid violate the same and increase the security after a converter outage.
Original languageEnglish
Title of host publicationProceedings of 2015 Australasian Universities Power Engineering Conference (AUPEC)
Number of pages6
Publication date2015
ISBN (Print)9781479987252
Publication statusPublished - 2015
Event2015 Australasian Universities Power Engineering Conference - Wollongong, Australia
Duration: 27 Sep 201530 Sep 2015


Conference2015 Australasian Universities Power Engineering Conference


  • load flow
  • power convertors
  • power system control
  • power system interconnection
  • power system reliability
  • power system security
  • power system simulation
  • voltage control
  • Components, Circuits, Devices and Systems
  • Engineering Profession
  • Power, Energy and Industry Applications
  • Robotics and Control Systems
  • Signal Processing and Analysis
  • DC voltage control
  • HVDC transmission
  • interconnected AC-DC systems security analysis
  • Jacobian matrices
  • Linear programming
  • Load flow control
  • N-1 security
  • Nordic power system
  • Power distribution
  • power distribution converter outage
  • Power system faults
  • Power system stability
  • power transfer distribution factors
  • PTDF
  • Security
  • Voltage control

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