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Title: Optimal Transmission Line Switching under Geomagnetic Disturbances

Abstract

Recently, there have been increasing concerns about how geomagnetic disturbances (GMDs) impact electrical power systems. Geomagnetically-induced currents (GICs) can saturate transformers, induce hot spot heating and increase reactive power losses. These effects can potentially cause catastrophic damage to transformers and severely impact the ability of a power system to deliver power. To address this problem, we develop a model of GIC impacts to power systems that includes 1) GIC thermal capacity of transformers as a function of normal Alternating Current (AC) and 2) reactive power losses as a function of GIC. We also use this model to derive an optimization problem that protects power systems from GIC impacts through line switching, generator dispatch, and load shedding. We then employ state-of-the-art convex relaxations of AC power flow equations to lower bound the objective. We demonstrate the approach on a modified RTS96 system and UIUC 150-bus system and show that line switching is an effective means to mitigate GIC impacts. We also provide a sensitivity analysis of decisions with respect to GMD direction.

Authors:
 [1]; ORCiD logo [2];  [2]; ORCiD logo [2]; ORCiD logo [3];  [2]
  1. Clemson Univ., SC (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Materials, Physics and Applications
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1407876
Report Number(s):
LA-UR-16-28374
Journal ID: ISSN 0885-8950; TRN: US1703057
Grant/Contract Number:
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
IEEE Transactions on Power Systems
Additional Journal Information:
Journal Volume: 33; Journal Issue: 3; Journal ID: ISSN 0885-8950
Publisher:
IEEE
Country of Publication:
United States
Language:
English
Subject:
24 POWER TRANSMISSION AND DISTRIBUTION; GMD; transmission line switching; convex relaxations; ACOPF; GIC

Citation Formats

Lu, Mowen, Nagarajan, Harsha, Yamangil, Emre, Bent, Russell, Backhaus, Scott, and Barnes, Arthur. Optimal Transmission Line Switching under Geomagnetic Disturbances. United States: N. p., 2017. Web. doi:10.1109/TPWRS.2017.2761178.
Lu, Mowen, Nagarajan, Harsha, Yamangil, Emre, Bent, Russell, Backhaus, Scott, & Barnes, Arthur. Optimal Transmission Line Switching under Geomagnetic Disturbances. United States. doi:10.1109/TPWRS.2017.2761178.
Lu, Mowen, Nagarajan, Harsha, Yamangil, Emre, Bent, Russell, Backhaus, Scott, and Barnes, Arthur. Wed . "Optimal Transmission Line Switching under Geomagnetic Disturbances". United States. doi:10.1109/TPWRS.2017.2761178.
@article{osti_1407876,
title = {Optimal Transmission Line Switching under Geomagnetic Disturbances},
author = {Lu, Mowen and Nagarajan, Harsha and Yamangil, Emre and Bent, Russell and Backhaus, Scott and Barnes, Arthur},
abstractNote = {Recently, there have been increasing concerns about how geomagnetic disturbances (GMDs) impact electrical power systems. Geomagnetically-induced currents (GICs) can saturate transformers, induce hot spot heating and increase reactive power losses. These effects can potentially cause catastrophic damage to transformers and severely impact the ability of a power system to deliver power. To address this problem, we develop a model of GIC impacts to power systems that includes 1) GIC thermal capacity of transformers as a function of normal Alternating Current (AC) and 2) reactive power losses as a function of GIC. We also use this model to derive an optimization problem that protects power systems from GIC impacts through line switching, generator dispatch, and load shedding. We then employ state-of-the-art convex relaxations of AC power flow equations to lower bound the objective. We demonstrate the approach on a modified RTS96 system and UIUC 150-bus system and show that line switching is an effective means to mitigate GIC impacts. We also provide a sensitivity analysis of decisions with respect to GMD direction.},
doi = {10.1109/TPWRS.2017.2761178},
journal = {IEEE Transactions on Power Systems},
number = 3,
volume = 33,
place = {United States},
year = {Wed Oct 11 00:00:00 EDT 2017},
month = {Wed Oct 11 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on October 11, 2018
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