scholarly journals Calculation of geomagnetically induced currents reactive power loss disturbance in China’s UHV power grid considering the influence of 500 kV power grid

2016 ◽  
Vol 46 (11) ◽  
pp. 1146-1156
Author(s):  
Chen QIAN ◽  
LianGuang LIU ◽  
XiaoPei QIN
Keyword(s):  
Power Loss ◽  
Reactive Power ◽  
Power Grid ◽  
Geomagnetically Induced Currents ◽  
Induced Currents

scholarly journals GICs: The Bane of Technology-Dependent Societies

Eos ◽  
2015 ◽  
Vol 96 ◽  
Author(s):  
Delores Knipp
Keyword(s):  
High Voltage ◽  
Power Loss ◽  
Reactive Power ◽  
Power Transmission ◽  
Geomagnetically Induced Currents ◽  
Transmission Systems ◽  
Power Transmission Systems ◽  
Induced Currents

Geomagnetically Induced Currents can cause voltage swings, transformer heating, and reactive power loss in high-voltage power transmission systems.

scholarly journals Analysis on the Impact of Geomagnetic Storm on Reactive Power and Voltage in Extrahigh Voltage Power Grid

2019 ◽  
Vol 118 ◽  
pp. 02049
Author(s):  
Lan Kang ◽  
Bin He ◽  
Peihong Yang ◽  
Xiaoling Dong
Keyword(s):  
Geomagnetic Storm ◽  
Power Loss ◽  
Large Scale ◽  
Reactive Power ◽  
Geomagnetic Storms ◽  
Power Grid ◽  
Geomagnetically Induced Currents ◽  
Voltage Level ◽  
The Impact ◽  
First Time

With the growing scale of the power grid and the improvement of the voltage level, the geomagnetically induced currents (GICs) generated by geomagnetic storms has become one of the leading factors that cause large-scale power outages in power grid. Considering the global simultaneity characteristic of geomagnetic storms, this paper presents the concept of mass reactive power disturbance for the first time, analyzes the mechanism of GIC reactive power loss of transformer and reveals the mechanism of mass reactive power disturbance’s influence on voltage. Finally, combined with the practical situation of 750kV EHV power grid in China, the reactive power loss and voltage distribution under the geomagnetic storms at various intensities are calculated, with the grid operating in two typical modes, and the impact of the geomagnetic storm on voltage is illustrated, which provides the theoretical basis for the study of voltage stability.

Reactive Power Loss Index for Identification of Weak Nodes and Reactive Compensation Analysis to Improve Steady State Voltage Stability

2020 ◽  
pp. 177-237
Author(s):  
Tukaram Moger ◽  
Thukaram Dhadbanjan
Keyword(s):  
Steady State ◽  
Power Loss ◽  
Voltage Stability ◽  
Reactive Power ◽  
Power Grid ◽  
Southern Region ◽  
Equivalent System ◽  
Reactive Compensation ◽  
Simulation Results ◽  
Loss Index

This chapter presents a new reactive power loss index for identification of weak buses in the system. This index can be used for identification of weak buses in the systems. The new reactive power loss index is illustrated on sample 5-bus system, and tested on sample 10-bus equivalent system and 72-bus equivalent system of Indian southern region power grid. The validation of the weak buses identification from the reactive power loss index with that from other existing methods in the literature is carried out to demonstrate the effectiveness of the index. Simulation results show that the identification of weak buses in the system from the new reactive power loss index is completely non-iterative, and thus requires minimal computational efforts as compared with other existing methods in the literature.

scholarly journals Prediction of geomagnetically induced currents (GICs) flowing in Japanese power grid for Carrington-class magnetic storms

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Yusuke Ebihara ◽  
Shinichi Watari ◽  
Sandeep Kumar
Keyword(s):  
Transmission Lines ◽  
Power Grid ◽  
Magnetic Storms ◽  
Power Grids ◽  
Geomagnetically Induced Currents ◽  
Geomagnetic Disturbances ◽  
Low Latitude ◽  
Solar Eruptions ◽  
Induced Currents ◽  
Extra High Voltage

AbstractLarge-amplitude geomagnetically induced currents (GICs) are the natural consequences of the solar–terrestrial connection triggered by solar eruptions. The threat of severe damage of power grids due to the GICs is a major concern, in particular, at high latitudes, but is not well understood as for low-latitude power grids. The purpose of this study is to evaluate the lower limit of the GICs that could flow in the Japanese power grid against a Carrington-class severe magnetic storm. On the basis of the geomagnetic disturbances (GMDs) observed at Colaba, India, during the Carrington event in 1859, we calculated the geoelectric disturbances (GEDs) by a convolution theory, and calculated GICs flowing through transformers at 3 substations in the Japanese extra-high-voltage (500-kV) power grid by a linear combination of the GEDs. The estimated GEDs could reach ~ 2.5 V/km at Kakioka, and the GICs could reach, at least, 89 ± 30 A near the storm maximum. These values are several times larger than those estimated for the 13–14 March 1989 storm (in which power blackout occurred in Canada), and the 29–31 October 2003 storm (in which power blackout occurred in Sweden). The GICs estimated here are the lower limits, and there is a probability of stronger GICs at other substations. The method introduced here will be immediately applicable for benchmark evaluation of low-latitude GICs against the Carrington-class magnetic storms if one assumes electrical parameters, such as resistance of transmission lines, with sufficient accuracy.

Power Grid Sensitivity Analysis of Geomagnetically Induced Currents

2013 ◽  
Vol 28 (4) ◽  
pp. 4821-4828 ◽  
Author(s):  
Thomas J. Overbye ◽  
Komal S. Shetye ◽  
Trevor R. Hutchins ◽  
Qun Qiu ◽  
James D. Weber
Keyword(s):  
Sensitivity Analysis ◽  
Power Grid ◽  
Geomagnetically Induced Currents ◽  
Induced Currents

On the flow of geomagnetically induced currents in an electric power transmission network

2010 ◽  
Vol 88 (5) ◽  
pp. 357-363 ◽  
Author(s):  
Risto J. Pirjola
Keyword(s):  
Electric Power ◽  
Power Transmission ◽  
Power Grid ◽  
Space Physics ◽  
Practical Significance ◽  
Test Model ◽  
Geomagnetically Induced Currents ◽  
Geophysical Research ◽  
Model Calculations ◽  
Induced Currents

Geomagnetically induced currents (GICs) in conductor networks are among the ground-level effects of space weather. GICs are a possible source of problems to the system. Today, electric power transmission grids are the most important concern regarding GICs, which may in the worst cases lead to blackouts in large areas and permanent damage to transformers. The evaluation of GIC risks and the design of possible countermeasures require estimation of expected GIC magnitudes in transformers. This can be achieved by model calculations supplemented by GIC recordings at some sites. Although in principle GICs can flow all over a large galvanically-connected power grid, which should thus be included as a whole in a GIC calculation, the network must usually be restricted somehow in practical computations of GICs. By using a power grid test model, this paper provides a systematic numerical investigation showing that GICs do not flow over very long distances in a power grid, which is a good result and justifies the neglect of the parts of the network that lie far away from the area of primary interest. Besides practical significance in electric power engineering, studies of GICs can be used for space physics and geophysical research as well. It is also important to understand the features of the flow pattern of GICs in a network.

Coordinated reactive power optimization for multi-TSO grids in an autonomous way

2016 ◽  
Vol 35 (5) ◽  
pp. 1724-1740
Author(s):  
Anan Zhang ◽  
Shi Chen ◽  
Fan Zhang ◽  
Xuliang Zhang ◽  
Hongwei Li ◽  
...  
Keyword(s):  
Power Loss ◽  
Voltage Stability ◽  
Reactive Power ◽  
Power Optimization ◽  
Extreme Values ◽  
Power Grid ◽  
Reactive Power Optimization ◽  
Content Type ◽  
Static Voltage Stability ◽  
Power Injection

Purpose It is very indispensable for the various control centers of multi-transmission system owners (TSOs) grids to coordinate their reactive power optimization (RPO) efforts. However, such coordinated equilibrium point is comparatively hard to achieve unless one TSO control center could obtain all grids’ information in detail, which may lead to confidential issue and heavy communicating load. The purpose of this paper is to propose a solution to optimizing the reactive power control efforts among multi-TSOs grids with a mathematic interconnection model and reasonable communication cost. Design/methodology/approach Based on the interconnected power network equation, the stability-related optimum reactive power injection and the power-loss-related optimum reactive power injection were derived, respectively. Furthermore, according to the decomposition-and-coordination-based computing methodology, a coordinated RPO model for interconnected TSOs was designed, taking into consideration both the static voltage stability and economy. Findings The extreme values for the indicator L of power grid voltage stability and active power loss function were found and proved to be minimums. According to these extreme values, an expression for the reactive power injection at interconnected nodes between TSOs grids was obtained, and a coordinated strategy of RPO was established, which could take the static voltage stability and economy into consideration without confidential concern. Originality/value The existence of minimum values for indicator L of voltage stability and power loss was demonstrated, respectively. And the method presented in this paper can ensure the safety of information among different TSO grids, i.e. avoiding confidential issues. In particular, the coordinated control method can be implemented on the local power grid without knowing all of the parameters of its interconnection.

Geomagnetically induced currents in a power grid of northeastern Spain

Space Weather ◽  
2012 ◽  
Vol 10 (6) ◽  
pp. n/a-n/a ◽  
Author(s):  
J. Miquel Torta ◽  
Lluís Serrano ◽  
J. Ramon Regué ◽  
Albert M. Sánchez ◽  
Elionor Roldán
Keyword(s):  
Power Grid ◽  
Geomagnetically Induced Currents ◽  
Induced Currents
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