Short circuit current analysis for different types of wind turbines

2012 ◽  
Author(s):  
A.M Sadati ◽  
H. Kazemi Karegar ◽  
P. Saadat ◽  
N. Niassati
Keyword(s):  
Wind Turbines ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Current Analysis ◽  
Different Types

Calculation and Analysis of Three-Phase Transformer Short-Circuit Current

2014 ◽  
Vol 986-987 ◽  
pp. 1914-1917
Author(s):  
Pei Ming Pan ◽  
Huan Lian ◽  
Fei Xiang Hui ◽  
Wei Pu Tan
Keyword(s):  
Short Circuit ◽  
Short Circuit Current ◽  
Stable Operation ◽  
Application Range ◽  
Three Phase ◽  
Different Types ◽  
Calculation Results ◽  
Current Calculation ◽  
Important Significance ◽  
Selection Of

Analysis the important significance of transformer short-circuit current calculation for the stable operation of power system. Lead to three different types of transformer short-circuit current calculation methods, this literature uses a simplified example to compare the characters among three methods. Meanwhile, calculation by using the theory to get a quantitative range of simplified method. The calculation results and theory support each other, finally, summarizing the application range of the three methods, and offering a reference for reasonable selection of short-circuit current methods.

scholarly journals Research on the potential-induced degradation (PID) of PV modules running in two typical climate regions

Clean Energy ◽  
2019 ◽  
Vol 3 (3) ◽  
pp. 222-226
Author(s):  
Gang Sun ◽  
Xiaohe Tu ◽  
Rui Wang
Keyword(s):  
Degradation Mechanism ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Climatic Conditions ◽  
Photovoltaic Modules ◽  
Significant Potential ◽  
Significant Difference ◽  
Pv Modules ◽  
Different Types

Abstract In order to accurately select photovoltaic modules under different climatic conditions, three kinds of polycrystalline silicon photovoltaic modules were prepared for this study using different properties of packaging materials and two typical climatic zones of China were selected for installation and operation of these photovoltaic (PV) modules. The photoelectric parameters (maximum power, open-circuit voltage, short-circuit current, etc.) and electroluminescence images of these modules were analysed before and after their operation for 6 months. The study found that the performance of PV modules in different climatic regions shows different decay tendency and degradation mechanism. There was a significant difference in the degradation of the three different types of PV modules in the sub-humid-hot region (Suzhou, Jiangsu); two kinds of photovoltaic modules using relatively poorly performing package materials showed significant potential-induced degradation effects. However, the degradation trend of the three different types of PV modules in the warm-temperate region (Kenli, Shandong) was consistent and no significant potential-induced degradation effect was observed.

Effects of pH, Ca, ADH, and theophylline on kinetics of Na entry in frog skin

1978 ◽  
Vol 235 (1) ◽  
pp. C35-C48 ◽  
Author(s):  
L. J. Mandel
Keyword(s):  
Short Circuit ◽  
External Solution ◽  
Short Circuit Current ◽  
Electrochemical Gradient ◽  
Experimental Conditions ◽  
Entry Barrier ◽  
Different Types ◽  
Effects Of Ph ◽  
Kinetics Of ◽  
External Ph

The short circuit current as a function of Na concentration in both solutions was found to obey Michaelis-Menten kinetics under a variety of experimental conditions. Values of maximal transport rate (Im) and half-maximal Na concentrations (Kt) were determined from these experiments. Three type of results were obtained: 1) Im and Kt both decreased by approximately the same fraction when the pH of both solutions was reduced by increasing PCO2, 2) Im decreased and Kt increased when the external pH was decreased, and 3) Im increased with ADH and theophylline, decreased with external Ca, and Kt remained unchanged. Various criteria were utilized to determine that these were properties of the entry barrier for Na into the "transport pool." The results are explained in terms of a model that separates three different types of actions on the entry barrier: 1) competition of Na with other ions in the external solution for entry, 2) modulation of the number of sites available for Na translocation by changing the cytoplasmic pH, and 3) alterations in the rate of Na translocation caused by changes in the Na permeability or the electrochemical gradient across the entry barrier.

Short-Circuit Current Contribution of Doubly-Fed Wind Turbines according to IEC and IEEE Standards

2020 ◽  
pp. 1-1
Author(s):  
F. Jimenez-Buendia ◽  
A. Honrubia-Escribano ◽  
A. Lorenzo-Bonache ◽  
E. Artigao-Andicoberry ◽  
E. Gomez-Lazaro
Keyword(s):  
Wind Turbines ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Current Contribution ◽  
Ieee Standards ◽  
Doubly Fed

scholarly journals Review on Short-circuit Current Analysis and Suppression Techniques for MMC-HVDC Transmission Systems

2020 ◽  
Vol 10 (19) ◽  
pp. 6769
Author(s):  
Boyu Qin ◽  
Wansong Liu ◽  
Ruowei Zhang ◽  
Jialing Liu ◽  
Hengyi Li
Keyword(s):  
Direct Current ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Power Grids ◽  
Stable Operation ◽  
Current Analysis ◽  
Transmission Systems ◽  
Hvdc Transmission ◽  
Dc Power ◽  
Short Circuit Calculation

The modular multilevel converter (MMC) has been widely adopted in high voltage direct current (HVDC) transmission systems due to its significant advantages. MMC-HVDC is developing towards multi-terminal direct current (MTDC) power grid for reliability enhancement. However, there exist a huge amplitude and a steep rise in fault current due to the low impedances of DC lines and MMCs, which threaten the security and reliability of the DC power grids. It is necessary to restrain the DC short circuit current in order to ensure the safe and stable operation of DC power grids. This paper gives a comprehensive review and evaluation of the proposed DC short-circuit current analysis and suppression techniques used in MMC-based MTDC power girds, in terms of MMC modeling, short circuit calculation, and suppression method. In addition, future trends of countermeasures to short circuit current in MMC-based MTDC power grids are also discussed.

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