Performing Comprehensive Voltage Stability Studies for the Determination of Optimal Location, Size and Type of Reactive Compensation

2006 ◽  
Author(s):  
P. Pourbeik ◽  
R. Koessler ◽  
W. Quaintance ◽  
W. Wong
Keyword(s):  
Voltage Stability ◽  
Optimal Location ◽  
Stability Studies ◽  
Reactive Compensation

Simulation Study on Dynamic Reactive Power Compensation of Grid-Connected Wind Farms

2013 ◽  
Vol 756-759 ◽  
pp. 4171-4174 ◽  
Author(s):  
Xiao Ming Wang ◽  
Xing Xing Mu
Keyword(s):  
Voltage Stability ◽  
Wind Farm ◽  
Reactive Power ◽  
Wind Farms ◽  
Reactive Power Compensation ◽  
Wind Speeds ◽  
Wind Generators ◽  
Reactive Compensation ◽  
Farm Model ◽  
Set Up

With the Asynchronous wind generators as research object, this paper analyzes the problems of the voltage stability and the generation mechanism of the reactive power compensation during the wind farms connected operation. For paralleling capacitor bank has shown obvious defects, therefore this paper employs dynamic reactive power compensation to improve reactive characteristics of grid-connected wind farms. With the influences of different wind disturbances and grid faults on wind farms, wind farm model is set up and dynamic reactive power compensation system and wind speeds are built in the Matlab/Simulink software, The simulation result shows that they can provide reactive power compensation to ensure the voltage stability of the wind farms. But STATCOM needs less reactive compensation capacity to make sure the voltage and active power approaching steady state before the faults more quickly, Therefore STATCOM is more suitable for wind farms connected dynamic reactive power compensation.

scholarly journals Simultaneous Determination and Stability Studies on Diminazene Diaceturate and Phenazone Using Developed Derivative Spectrophotometric Method

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Ruaa Mohamed Akode ◽  
Shaza Wagiealla Shantier ◽  
Elrasheed Ahmed Gadkariem ◽  
Magdi Awadalla Mohamed
Keyword(s):  
Simultaneous Determination ◽  
Correlation Coefficients ◽  
Degradation Process ◽  
Stability Studies ◽  
Temperature Dependent ◽  
First Order Kinetics ◽  
First Derivative Spectrophotometry ◽  
Aqueous Mixture ◽  
Photo Stability

This work presents UV first derivative spectrophotometry as a precise, accurate, and feasible method for simultaneous determination of diminazene diaceturate and phenazone in bulk and dosage forms. The absorbance values of diminazene diaceturate and phenazone aqueous mixture were obtained at 398 nm and 273 nm, respectively. The developed method was proved to be linear over the concentration ranges (2–10) μg/mL and (2.496–12.48) μg/mL for diminazene diaceturate and phenazone, respectively, with good correlation coefficients (not less than 0.997). The detection and quantitation limits were found to be (LOD = 0.63 and 0.48 μg/mL; LOQ = 1.92 and 1.47 μg/mL, resp.). The developed method was employed for stability studies of both drugs under different stress conditions. Diminazene diaceturate was prone to degrade at acidic pH via first-order kinetics. The degradation process was found to be temperature dependent with an activation energy of 7.48 kcal/mole. Photo-stability was also investigated for this drug.

scholarly journals Determination of Optimal Location and Capacity of Detention Facilities

2014 ◽  
Vol 70 ◽  
pp. 1037-1045 ◽  
Author(s):  
S. Lim ◽  
V.H. Ho ◽  
S.Y. Lee ◽  
D.G. Yoo ◽  
J.H. Kim
Keyword(s):  
Optimal Location ◽  
Detention Facilities

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.

Determination of optimal location for thoracoscopic-assisted pulmonary surgery for lung lobectomy in cats

2019 ◽  
Vol 80 (11) ◽  
pp. 1050-1054 ◽  
Author(s):  
Jacqueline E. Scott ◽  
Ameet Singh ◽  
J. Brad Case ◽  
Philipp D. Mayhew ◽  
Jeffrey J. Runge
Keyword(s):  
Optimal Location ◽  
Lung Lobectomy ◽  
Pulmonary Surgery

scholarly journals Spectrofluorometric Determination of Verapamil Hydrochloride in Pharmaceutical Preparations and Human Plasma Using Organized Media: Application to Stability Studies

2006 ◽  
Vol 89 (6) ◽  
pp. 1565-1572 ◽  
Author(s):  
Mohamed Walash ◽  
Fathalla Belal ◽  
Nahed El-Enany ◽  
Amina Abdelsalam
Keyword(s):  
Human Plasma ◽  
Biological Fluids ◽  
Sodium Dodecyl ◽  
Pharmaceutical Preparations ◽  
Pharmaceutical Formulations ◽  
Official Method ◽  
Stability Studies ◽  
Verapamil Hydrochloride ◽  
Spiked Human Plasma

Abstract A highly sensitive spectrofluorometric method was developed for the determination of verapamil hydrochloride (VP HCl) in pharmaceutical formulations and biological fluids. The proposed method is based on investigation of the fluorescence spectral behavior of VP HCl in micellar systems, such as sodium dodecyl sulfate (SDS) and β-cyclodextrin (β-CD). In aqueous solutions of borate buffer of pH 9 and 8.5, VP HCl was well incorporated into SDS and β-CD, respectively, with enhancement of its native fluorescence. The fluorescence was measured at 318 nm after excitation at 231 nm. The fluorescence intensity enhancements were 183 and 107% in SDS and in β-CD, respectively. The fluorescence-concentration plots were rectilinear over the range of 0.020.2 and 0.020.25 μg/mL, with lower detection limits of 5.58 × 103 and 3.62 × 103 μg/mL in SDS and β-CD, respectively. The method was successfully applied to the analysis of commercial tablets and the results were in good agreement with those obtained with the official method. The method was further applied to the determination of VP HCl in real and spiked human plasma. The mean % recoveries in the case of spiked human plasma (n 4) was 92.59 3.11 and 88.35 2.55 using SDS and β-CD, respectively, while that in real human plasma (n 3) was 90.17 6.93 and 89.17 6.50 using SDS and β-CD, respectively. The application of the method was extended to the stability studies of VP HCl after exposureto ultraviolet radiation and upon oxidation with hydrogen peroxide.

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