Geomagnetically induced currents: A measurement based inverse determination of earth impedances

Schachinger, Philipp; Albert, Dennis A.; Renner, Herwig

doi:10.1109/upec50034.2021.9548157

Cited by 3 publications

(4 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Schachinger et al. (2021) have recently reported that they have measured and identified sources of low frequency currents by measuring GIC in several power transformer neutrals in Austria originating from DC powered public transportation leakage currents that would enter the transmission system. In general, our spikes are sporadic at night hours and can be manually cleaned up when data are being processed, but during the day, they produce noisy magnetic records that could mask GIC signals if they are tiny enough.…”

Section: Resultsmentioning

confidence: 99%

“…This incidents were already reported by Matandirotya et al (2016), and we, like them, believe that they are related to power grid switching or voltage transients originating from high-power-demanding on the end load of power transmission and distribution networks, which result in changes in power line currents, whose magnetic effects are not effectively filtered in the one-second data provided by the magnetometers. Schachinger et al (2021) have recently reported that they have measured and identified sources of low frequency currents by measuring GIC in several power transformer neutrals in Austria originating from DC powered public transportation leakage currents that would enter the transmission system. In general, our spikes are sporadic at night hours and can be manually cleaned up when data are being processed, but during the day, they produce noisy magnetic records that could mask GIC signals if they are tiny enough.…”

Section: Eventmentioning

confidence: 99%

See 1 more Smart Citation

Validating GIC Modeling in the Spanish Power Grid by Differential Magnetometry

et al. 2021

View full text Add to dashboard Cite

Disturbed conditions in the Sun are potential sources of events of strongly enhanced dissipation of solar wind energy in the near-Earth space environment, also known as Space Weather events, which manifest themselves as varying electric currents flowing in the coupled magnetosphere -ionosphere system. These events trigger numerous and diverse phenomena both in the surface and in the space environment of our planet. One of the consequences of such variable currents is a varying electromagnetic field on the ground that, in the presence of the conductive earth, induces an electric current in the subsurface. This, in turn, produces a secondary electromagnetic field that is superposed to the incident one, giving rise to the observed geoelectric and geomagnetic fields. Geomagnetically induced currents (GIC) are electrical currents induced in earthed conductors in response to geoelectric fields ultimately resulting from space weather events. Electric-power transmission grids and pipelines are commonly affected negatively by GIC, potentially causing problems such as damaged power transformers and

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Eventmentioning

confidence: 99%

Validating GIC Modeling in the Spanish Power Grid by Differential Magnetometry

et al. 2021

View full text Add to dashboard Cite

show abstract

“…This is called the Nodal Admittance Matrix method [7]. As described by [12], this is equivalent to the well-known Lehtinen-Pirjola method and was proofed with real measurements in [7,13,14].…”

Section: Introductionmentioning

confidence: 96%

Reduction of Geomagnetically Induced Current Impacts by Optimized Neutral Point Connections

Schachinger

Albert

Renner

2023

Preprint

View full text Add to dashboard Cite

Solar storms impact electrical power grids by causing DC neutral point currents in transformers. These currents lead to half-cycle saturation as well as other related and unwanted effects in the grid. To reduce the effect of these currents on the grid, DC-blocking devices can be installed or changes in the grid topology can be made. However, these counter measures often have unwanted side effects or cannot be applied to the grid due to operational restrictions. In this work, a novel mitigation approach, based on the distribution of currents on more transformers, is presented. The number and location of grounded transformer neutral points is optimized, taking grid related constraints such as the minimal number of transformer connections into account. It is shown that the algorithm can effectively reduce the stress on transformers without any additional assets and thus increase system security.

show abstract

“…This is called the Nodal Admittance Matrix method [7]. As described by [12], this is equivalent to the well‐known Lehtinen‐Pirjola method and was proofed with real measurements in [7, 13, 14].…”

Section: Introductionmentioning

confidence: 99%

Reduction of geomagnetically induced current impacts by optimized neutral point connections

Schachinger

Albert

Renner

2023

IET Generation Trans & Dist

Self Cite

View full text Add to dashboard Cite

Solar storms impact electrical power grids by causing quasi‐DC neutral point currents in transformers. These currents lead to half‐cycle saturation as well as other related and unwanted effects in the grid. To reduce the effect of these currents on the grid, DC‐blocking devices can be installed or changes in the grid topology can be made. However, these counter measures often have unwanted side effects or cannot be applied to the grid due to operational restrictions. In this work, a novel mitigation approach, based on the distribution of currents on more transformers, is presented. The number and location of grounded transformer neutral points is optimized, taking grid related constraints such as the minimal number of transformer connections into account. It is shown that the algorithm can effectively reduce the stress on transformers without any additional assets and thus increase system security.

show abstract

Geomagnetically induced currents: A measurement based inverse determination of earth impedances

Cited by 3 publications

References 14 publications

Validating GIC Modeling in the Spanish Power Grid by Differential Magnetometry

Validating GIC Modeling in the Spanish Power Grid by Differential Magnetometry

Reduction of Geomagnetically Induced Current Impacts by Optimized Neutral Point Connections

Reduction of geomagnetically induced current impacts by optimized neutral point connections

Contact Info

Product

Resources

About