Low Frequency Currents Source Identification

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

doi:10.1109/ichqp53011.2022.9808423

Cited by 5 publications

(2 citation statements)

References 4 publications

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“…As these currents and their effects on transformers can lead to serious damages in the grid, was the case in the Hydro-Quebec Blackout in 1989 [3,4] or the Malmö Blackout in 2003 [5], the calculation of GICs and the development of mitigation strategies have become an important aspect for power grid safety. There are other sources in the grid which also result in DC neutral point currents, e.g., public transportation systems [6,7], recurring switching actions [6], galvanic coupling from cathodic corrosion protection [8] or coupling in AC/DC hydrid lines [9]; however, the magnitudes are lower than those of GICs.…”

Section: Introductionmentioning

confidence: 99%

Reduction of Geomagnetically Induced Current Impacts by Optimized Neutral Point Connections

Schachinger

Albert

Renner

2023

Preprint

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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.

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Section: Introductionmentioning

confidence: 99%

Reduction of Geomagnetically Induced Current Impacts by Optimized Neutral Point Connections

Schachinger

Albert

Renner

2023

Preprint

View full text Add to dashboard Cite

show abstract

“…There are other sources in the grid which also result in quasi-DC neutral point currents, for example, public transportation systems [6,7], recurring switching actions [6], galvanic coupling from cathodic corrosion protection [8] or coupling in AC/DC hydrid lines [9]; however, the magnitudes are lower than those of GICs.…”

Section: Introductionmentioning

confidence: 99%

Reduction of geomagnetically induced current impacts by optimized neutral point connections

Schachinger

Albert

Renner

2023

IET Generation Trans & Dist

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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