scholarly journals ANALYSIS OF GEOMAGNETICALLY INDUCED CURRENT IN POWER GRID DURING GEOMAGNETIC STORM

2020 ◽  
Vol 5 (8) ◽  
Author(s):  
Smit Anjana ◽  
Mihir Patel
Keyword(s):  
Power System ◽  
Transmission Lines ◽  
Geomagnetic Storms ◽  
Risk Mitigation ◽  
Power Grid ◽  
Activity Level ◽  
System Level ◽  
Half Cycle ◽  
Solar Storms ◽  
Protective Relays

Solar storms are event that has a big range of averse outcome on technological system, power grid specifically. During extreme geomagnetic storms a GIC begin to travel between long transmission lines or conducting constructions. The possibility of solar storms features an approximately linear relation with the sun spot activity level that fluctuates in eleven years cycle. This paper could be threat examination of GIC in power system and describe the causes, the implications, each on power system apparatus level and on power system level. When GIC flow in neutral of transformer winding it start to causes the Half-cycle core saturation and produce high level of harmonics can sense bad fault situation to protective relays and mis-operation of circuit breakers. Also this paper mentioned potential risk mitigation ways

Effects of GIC in Power System and Control Measures

2012 ◽  
Vol 182-183 ◽  
pp. 676-680
Author(s):  
You Jie Ma ◽  
Dong Fang Wu ◽  
Xue Song Zhou
Keyword(s):  
Power System ◽  
Transmission Lines ◽  
Large Scale ◽  
Geomagnetic Storms ◽  
Neutral Line ◽  
Power Grid ◽  
Electric Power System ◽  
Control Measures ◽  
Long Distance ◽  
The Earth

The geomagnetic storm which is caused by the sun's activity is a global natural disaster. For the transformer neutral line connects to the earth directly, the geomagnetic storms can induce GIC in the loop formed by the earth and the transmission lines with long distance. The GIC has very big effect on the safe operation of electric power system when it flows in power grid. It includes the main damages on power system equipment caused by the GIC, the introduction of the GIC generation principle, main features, analysis algorithm and some control measures in this paper. Finally, point out that the GIC of the long distance transmission system and large-scale power grid should be paid more attention.

The Comparative Study on Influence on the Northeast China UHV Planning Power Grid Induced by Different Kind Geomagnetic Storms

2013 ◽  
Vol 330 ◽  
pp. 143-148
Author(s):  
Yan Cheng ◽  
Kai Rang Wang ◽  
Shu Min Sun ◽  
Hai Yang Ge ◽  
Guang Lei Li
Keyword(s):  
High Voltage ◽  
Transmission Lines ◽  
Power Flow ◽  
Geomagnetic Storms ◽  
Evaluation Model ◽  
Timing Analysis ◽  
Power Grid ◽  
Long Distance ◽  
The Impact ◽  
Ultra High Voltage

Along with the UHV construction scheme, China will form a large number of transmission lines which have the characteristics of the ultra-high voltage, large-capacity, long-distance. Because the UHV power grid transmission line parameters and the structure of the grid and the transformer are different from the other power net, Geomagnetic storms will affect the UHV power grid more, the work have important significance to the assessment of the ultra-high voltage power grid level and influence. The impact of different storms on the grid are also different .Based on the power flow mechanism of the GIC, different data and network parameters of geomagnetic storms, the evaluation model of the GIC is established ,we assess the result of the GIC induced by the geomagnetic storms happened on November 2004 and December 2006 in the 2020 planning ultra-high voltage power grid, find out the greatest impact transformer substation and the timing analysis results of the grid compare the different impact of different storm.. The comparison of the analysis results is helpful for understanding the different kind geomagnetic storms and the regional features of GIC.

Probability Analysis Method of Power System Cascading Failures Caused by Extreme Hot Weather

2013 ◽  
Vol 860-863 ◽  
pp. 1996-2002
Author(s):  
Qiang Chen ◽  
Yu Feng Guo ◽  
Na Pan ◽  
Ji Lai Yu
Keyword(s):  
Power System ◽  
Transmission Lines ◽  
Failure Probability ◽  
Heat Balance ◽  
Power Grid ◽  
Test System ◽  
Analysis Method ◽  
Power Sector ◽  
Hot Weather ◽  
The Heat Balance

In recent years, natural disasters happened frequently, which caused more and more failures of power system. To study the transmission lines failure under extreme hot weather, firstly the line's temperature changing with time is forecast based on the heat balance equation and the line's failure probability is calculated according to the historical statistics of failure rate. Then a test system to simulate the power grid under extreme hot weather is built and the curve of line's failure probability changing with time is obtained. The results provide a reference to power sector to guarantee the security and stability of the power grid.

New aspects of power grid facilities personnel workplaces electromagnetic environment

2020 ◽  
Vol 60 (9) ◽  
pp. 569-574
Author(s):  
Nina B. Rubtsova ◽  
Sergey Yu. Perov ◽  
Olga V. Belaya ◽  
Tatiana A. Konshina
Keyword(s):  
Transmission Lines ◽  
Power Transmission ◽  
Power Grid ◽  
Spectral Characteristics ◽  
Ground Level ◽  
Frequency Characteristics ◽  
Frequency Range ◽  
Electromagnetic Environment ◽  
Limit Values ◽  
Special Assessment

Introduction. Electromagnetic safety of power grid facilities staff requires the exclusion of electromagnetic fields (EMF) harmful effects. EMF is evaluated by 50 Hz electric and magnetic fields (EF and MF) values in the framework of working conditions special assessment, and very rarely the analysis of the electromagnetic environment (EME) is carried out in depth. The aim of the study - EME hygienic assessment of power grid EHV facilities personnel workplace with adequate 50 Hz EF and MF levels evaluation as well as the analysis of EF and MF in the frequency range from 5 Hz to 500 Hz amplitude-frequency characteristics. Materials and methods. 50 Hz EF and MF values assessment was carried out on open switchgears (S) of substations and within sanitary breaks of 500 and 750 kV overhead power transmission lines (OTL). Measurements along to OTL trasses was performed using matrix-based method. Measurements and analysis of EF and MF values in 5-500 Hz frequency range amplitude-frequency characteristics were performed in the territory of 500 and 750 kV S. Results. Power frequency 50 Hz measurements results at 500 and 750 kV S ground-level personnel workplaces showed the presence of an excess of permissible limit values by EF intensity and the absence of an excess by MF. The measured EF values within 500 and 750 kV OTL sanitary gaps require limiting the working time of linemen due to the excess of the hygienic norms for full work shift, while the MP levels were almost completely within the standard values for persons not occupationally connected with electrical installations maintenance. MF and EE frequency range from 50 Hz to 500 Hz spectral characteristics analysis showed that 3rd harmonic percentage does not exceed 2.5% for EF and 6% for MF of the main level, the level of the 5th harmonic does not exceed 1% for EF and 3.5% for MF, the level of the 7th harmonic does not exceed 0.2% for EF and 0.8% for MF. These data show despite its low levels the contribution of MF different harmonics in a possible adverse impact on humane than EF corresponding harmonics. Conclusions. There was the confirmation of the previously justified use of the "matrix" scheme for of EF and MF values measurement along OTL routes. The relevance of to EF and MF all frequency components expos ure assessing possible health risk in extremely high voltage S territories and under OTL, based on international recommendations due to the lack of sanitary regulations in the Russian Federation for >50 Hz-30 kHz EF and MF, is shown.

scholarly journals Impact of the Generation System Parameters on the Frequency Response of the Power System: A UK Grid Case Study

Electricity ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 143-157
Author(s):  
Jovi Atkinson ◽  
Ibrahim M. Albayati
Keyword(s):  
Power System ◽  
Frequency Response ◽  
Power Grid ◽  
Sudden Increase ◽  
Generation System ◽  
System Parameters ◽  
Primary Frequency ◽  
Primary Frequency Response ◽  
The Impact ◽  
System Inertia

The operation and the development of power system networks introduce new types of stability problems. The effect of the power generation and consumption on the frequency of the power system can be described as a demand/generation imbalance resulting from a sudden increase/decrease in the demand and/or generation. This paper investigates the impact of a loss of generation on the transient behaviour of the power grid frequency. A simplified power system model is proposed to examine the impact of change of the main generation system parameters (system inertia, governor droop setting, load damping constant, and the high-pressure steam turbine power fraction), on the primary frequency response in responding to the disturbance of a 1.32 GW generation loss on the UK power grid. Various rates of primary frequency responses are simulated via adjusting system parameters of the synchronous generators to enable the controlled generators providing a fast-reliable primary frequency response within 10 s after a loss of generation. It is concluded that a generation system inertia and a governor droop setting are the most dominant parameters that effect the system frequency response after a loss of generation. Therefore, for different levels of generation loss, the recovery rate will be dependent on the changes of the governor droop setting values. The proposed model offers a fundamental basis for a further investigation to be carried on how a power system will react during a secondary frequency response.

Optimization of Restoration Paths of Power System after Blackout

2013 ◽  
Vol 347-350 ◽  
pp. 1467-1472
Author(s):  
Wen Wei Huang ◽  
Gang Yao ◽  
Xiao Yan Qiu ◽  
Nian Liu ◽  
Guang Tang Chen
Keyword(s):  
Power System ◽  
Transmission Lines ◽  
Reactive Power ◽  
Minimum Spanning Tree ◽  
Operation Time ◽  
Combinatorial Problem ◽  
Weather Conditions ◽  
Recovery Process ◽  
Point Of View ◽  
Improved Genetic Algorithm

Optimization of restoration paths of power system after blackout is a multi-stage, multi-target, multi-variable combinatorial problem in the power system restoration. This paper presents a reasonable model and effectually method. The proposed model is considered as a typical partial minimum spanning tree problem from the mathematical point of view which considering all kinds of constraints. Improved data envelopment analysis (DEA) was used to get the weight which considering line charging reactive power, weather conditions, operation time and betweenness of transmission lines. The improved genetic algorithm method is employed to solve this problem. Finally, an example is given which proves the strategy of the line restoration can effectively handle the uncertainty of the system recovery process, to guarantee the system successfully restored after the catastrophic accidents.

scholarly journals Understanding Power System Behavior through Mining Archived Operational Data

2009 ◽  
Vol 10 (1) ◽  
Author(s):  
Sarasij Das ◽  
Nagendra Rao P S
Keyword(s):  
Data Mining ◽  
Power System ◽  
System Level ◽  
Data Sets ◽  
Total System ◽  
System Behavior ◽  
Average System ◽  
Recorded Data ◽  
Operational Data ◽  
Southern Regional

This paper is the outcome of an attempt in mining recorded power system operational data in order to get new insight to practical power system behavior. Data mining, in general, is essentially finding new relations between data sets by analyzing well known or recorded data. In this effort we make use of the recorded data of the Southern regional grid of India. Some interesting relations at the total system level between frequency, total MW/MVAr generation, and average system voltage have been obtained. The aim of this work is to highlight the potential of data mining for power system applications and also some of the concerns that need to be addressed to make such efforts more useful.

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