Parametric steady-state voltage stability assessment of power systems using benchmark scenarios of geomagnetic disturbances

Shetye, Komal S.; Overbye, Thomas J.

doi:10.1109/peci.2015.7064886

Cited by 18 publications

(5 citation statements)

References 10 publications

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“…Butala et al () provided comparison of observed and modeled transformer‐level GIC using PowerWorld in the same network, also with a uniform electric field. In a further example, Shetye and Overbye () modeled GIC in the same network using a single resistance for each substation. They applied the nonuniform, North American Electric Reliability Corporation (NERC) geomagnetic disturbance benchmark electric field across the region but did not compare their GIC calculations with measured GIC.…”

Section: Introductionmentioning

confidence: 99%

Transformer‐Level Modeling of Geomagnetically Induced Currents in New Zealand's South Island

et al. 2018

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During space weather events, geomagnetically induced currents (GICs) can be induced in high‐voltage transmission networks, damaging individual transformers within substations. A common approach to modeling a transmission network has been to assume that every substation can be represented by a single resistance to Earth. We have extended that model by building a transformer‐level network representation of New Zealand's South Island transmission network. We represent every transformer winding at each earthed substation in the network by its known direct current resistance. Using this network representation significantly changes the GIC hazard assessment, compared to assessments based on the earlier assumption. Further, we have calculated the GIC flowing through a single phase of every individual transformer winding in the network. These transformer‐level GIC calculations show variation in GICs between transformers within a substation due to transformer characteristics and connections. The transformer‐level GIC calculations alter the hazard assessment by up to an order of magnitude in some places. In most cases the calculated GIC variations match measured variations in GIC flowing through the same transformers. This comparison with an extensive set of observations demonstrates the importance of transformer‐level GIC calculations in models used for hazard assessment.

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Section: Introductionmentioning

confidence: 99%

Transformer‐Level Modeling of Geomagnetically Induced Currents in New Zealand's South Island

et al. 2018

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“…To evaluate the impact of GICs on the grid, power system models are reduced to their dc equivalent with a representation of the network resistances only. As such, steady-state analyses (static voltage stability analyses) of power systems under GIC conditions have been carried out in many studies [38], [39], [40].…”

Section: 𝒙̇= 𝒇(𝒙 𝑽)mentioning

confidence: 99%

Geomagnetically Induced Currents: Frequency Spectra and Threats to Voltage Stability

et al. 2022

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Geomagnetically Induced Currents (GICs) are induced after a complex interaction between the sun and earth's magnetic field. GICs may cripple power systems leading to voltage collapse and a drop in power quality. While the commonly-used dc model for GICs is valid for steady-state analyses of power systems and transformer responses, GICs must be represented with their continuously varying magnitudes and frequency components to understand the dynamic power system's response to solar storms. In this paper, we used measured GIC data from the 2003 Halloween storm to compare several signal processing techniques. The Fast Fourier Transform (FFT) with a fixed window size, Short-Time Fourier Transform (STFT) with a variable window size, wavelet transform, and Particle-Swarm Optimization (PSO) methods were used to identify the GIC frequency characteristics. To understand the effects of these GIC characteristics on voltage stability, a multi-machine network was modelled on a digital real-time simulator (OPAL-RT). The results reveal the limitations of fixed window FFT in capturing the dominant high-frequency GIC bandwidth arising during peak solar activity. Wavelet and STFT are recommended for GIC data analysis as they provide timefrequency localization. High-frequency GICs during sudden storm commencements and pulsation activity are more of a concern for voltage stability than lower frequency components. Novel results from this study suggest that limiting contingency analysis to only high magnitudes of dc/GIC does not cater for the underlining GIC dynamics. In addition to magnitude thresholds, contingency analysis should incorporate GIC characteristics such as frequency which affect voltage dynamics and thus power system stability.

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“…With the method, voltage collapse points can be pinpointed easily and quickly, a prerequisite for ensuring the voltage stability across each transmission line and voltage stability margins can be calculated, too. Reference 11 analyzes the effects produced by GMD on big power systems, and proposes using the findings achieved from the analysis of changes to two parameters, that is, transformer reactive power losses and substation grounding resistance changes, to study how GMD influences the static voltage stability of power systems. In Reference 12, after calculating the GIC in power systems and the GIC‐inflicted additional reactive power losses on transformers, its author creates a model to figure out how the geoelectric field affects the long‐distance power transmission lines, and on the basis spots the nodes and sections of the power systems where the voltage stability is weak through the voltage violation nodes.…”

Section: Introductionmentioning

confidence: 99%

Research on power system static voltage stability considering geomagnetic disturbances effect

Yang

Kang

et al. 2020

Engineering Reports

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The reactive power losses caused by the power grid Geomagnetically Induced Current (GIC) severely disturb the static voltage stability of power systems, and may even trigger voltage collapses. In this paper, the 1 V/km uniform induced geoelectric field is adopted to analyze how greatly geomagnetic disturbance (GMD) can influence the static voltage stability of power systems, given the features of GMD disasters hitting the power grids of China. Considering the GIC reactive power losses, a method that combines second‐order sensitivity adaptive variable step size and local curve fitting is put forth to calculate the critical point of the active power and voltage nodes (PV) curve. With the increment ratio of the curve slope set at discretion, the method enables the curve to approach its critical point with great strides, a design managing to reduce the quantity of power flow calculations remarkably. By taking into account the reactive power violation of PV nodes in the acquisition of load increment step size, the method calculates the critical point of the PV curve in a much more accurate way. The method applied to the Northwest 750 kV power grid, the calculation results suggest that the 1 V/km induced geoelectric field markedly undermines the static voltage stability, thus posing grave threats to the above grid.

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Parametric steady-state voltage stability assessment of power systems using benchmark scenarios of geomagnetic disturbances

Cited by 18 publications

References 10 publications

Transformer‐Level Modeling of Geomagnetically Induced Currents in New Zealand's South Island

Transformer‐Level Modeling of Geomagnetically Induced Currents in New Zealand's South Island

Geomagnetically Induced Currents: Frequency Spectra and Threats to Voltage Stability

Research on power system static voltage stability considering geomagnetic disturbances effect

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