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Security Assessment in Gas-Electric Networks

In many parts of the world, electric systems experience an increasing amount of gas fired generation installed due to its cheap fuel. The flexibility offered by gas generators is considered to be beneficial for the electrical network, particularly in the face of increasing renewable generation. However, gas generators often are problematic for the gas network, as they induce large, rapid changes in the demand. The objective of this paper is to investigate the interaction between electrical and gas networks, and how different security criteria for gas system operations implicitly impact the security of the electric grid. Special attention is paid to the incorporation of the gas system dynamics, which have profound impact on the security assessment. To facilitate the assessment, the paper proposes an analysis framework which considers i) preventive security assessment for the gas system, ii) determination of remedial actions and gas load shed after a contingency occurs, and iii) the impact of the load shed on the electric grid, given different operating rules for the gas system. A case study shows that the preventive security assessment is beenficial both for the gas and electric grid, and that the security criterion used to determine the required gas system remedial actions impacts the cost and security of the electric grid.

Author(s):

Conor O Malley    
ETH Zurich
Switzerland

Line Roald    
Los Alamos National Laboratory
Switzerland

Gabriela Hug    
ETH Zurich
Switzerland

Drosos Kourounis    
USI Lugano
Switzerland

Olaf Schenk    
USI Lugano
Switzerland

 

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