Power grid stability protection against GIC using a capacitive grounding circuit

Rajapakse, Athula D.; Perera, N.; Faxvog, F. R.; Jensen, William R.; Nordling, G.; Fuchs, G. H. von; Jackson, D. B.; Volkmann, T.L.; Ruehl, N.; Groh, Benjamin H.

doi:10.1109/tdc.2012.6281589

Cited by 23 publications

(12 citation statements)

References 9 publications

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“…In addition, when using the neutral connected capacitor to block GIC, any nearby line-to-ground faults can develop transient overvoltage that causes the surge protection devices (SPDs) related to the blocking device to fail. These problems are typically avoided by connecting large capacitors to support fault current, applying voltage limiting schemes such as a varistor, spark gap [220,224], or thyristor switch [62], through bypassing the capacitor to discharge the neutral capacitance or interrupting the protection circuit [223], which would increase the cost and add complexity and bulkiness to the neutral solutions as well [2]. Moreover, many other research studies have been conducted to avoid or eliminate the problems mentioned above.…”

Section: Gic Blocking Devicesmentioning

confidence: 99%

A Review of Geomagnetically Induced Current Effects on Electrical Power System: Principles and Theory

et al. 2020

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Geomagnetically induced current (GIC) has been a significant concern for the electrical power grid in high latitudes for decades. Its origin starts in the Sun; during extreme space weather, the magnetic field of the Earth varies rapidly. This variation induces electric fields at the Earth's surface and leads to GICs in manmade technologies. Power systems are the most affected by this induced current, which causes halfcycle saturation of power transformers and other issues. Understanding the behaviours and chain effects of this phenomenon is the key consideration in modelling the hazards to technological systems from space weather. In this paper, a comprehensive review of space weather, geomagnetic disturbances (GMDs) and GICs and their impacts on the power systems in both high and mid-low latitude regions is presented. Additionally, we highlight the most commonly used methods to model and calculate geoelectric fields at the Earth's surface and GIC in the power systems with respect to DC and AC analysis. In addition, we have classified the GIC effects on the different power system components. Moreover, the possible solutions and mitigation techniques to eliminate or reduce these effects based on different GIC blocking devices are reviewed in this work. This work provides researchers and power system operators a shortcut road path to understanding GIC phenomena, modelling and calculations, effects, and mitigation of these effects.

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Section: Gic Blocking Devicesmentioning

confidence: 99%

A Review of Geomagnetically Induced Current Effects on Electrical Power System: Principles and Theory

et al. 2020

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“…There are, however, methods to block or partially block GICs [12]- [18]. GIC blocking methods include passive devices such as linear resistors [12], capacitors with non-linear resistors (Varistors/MOV) [13], polarizing cells [12], neutral capacitors [14], or series capacitors [16]. Other GIC blocking methods include active devices placed in-line or inserted in the neutral of the transformer to cancel the dc currents directly [18].…”

Section: Introductionmentioning

confidence: 99%

The Impact of Geomagnetically Produced Negative-Sequence Harmonics on Power Transformers

AbuHussein

Sadi

2021

IEEE Access

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Geomagnetically induced currents (GICs), although small in magnitude, can inflict detrimental effects on power systems. GICs damage transformers, generate unusual harmonics, trip reactive power support equipment, cause protective relays to malfunction, and may even collapse the entire power system if not mitigated. This paper studies the adverse effects of the negative-sequence harmonics produced by GICs flowing in power transformers. Our simulations show that a transformer's susceptibility to GIC depends on core type, voltage level, associated harmonics order, and GIC magnitude. High-voltage and extra-highvoltage tests were carried out in SIMULINK. GIC was also emulated experimentally to validate the simulated excitation current and harmonics produced by the GIC. The simulation and experimental results show that the 2nd and the 5th harmonics are the most prominent harmonics associated with GIC and dc saturation. Even if a transformer is ungrounded, the negative-sequence harmonics produced by the GIC can still propagate through a transformer and cause harmful effects on the isolated side.

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“…Several different techniques have been proposed to solve or mitigate this problem [3], [11], and [12], but in this paper we put forward an alternative solution. Here, it is proposed to add a device to the neutral of the high voltage winding of LPTs which would inject a DC bias, equal to the quasi static DC bias from GICs, theoretically to float the transformer windings by the few volts removing the voltage differential in the power lines from HEMP or GMD.…”

Section: Introductionmentioning

confidence: 99%

HEMP Transformer Defense Through Power Electronics

Burkes

Vincent

2020

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Power grid stability protection against GIC using a capacitive grounding circuit

Cited by 23 publications

References 9 publications

A Review of Geomagnetically Induced Current Effects on Electrical Power System: Principles and Theory

A Review of Geomagnetically Induced Current Effects on Electrical Power System: Principles and Theory

The Impact of Geomagnetically Produced Negative-Sequence Harmonics on Power Transformers

HEMP Transformer Defense Through Power Electronics

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