scholarly journals Identification of Efficient Sampling Techniques for Probabilistic Voltage Stability Analysis of Renewable-Rich Power Systems

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2328
Author(s):  
Mohammed Alzubaidi ◽  
Kazi N. Hasan ◽  
Lasantha Meegahapola ◽  
Mir Toufikur Rahman
Keyword(s):  
Monte Carlo ◽  
Stability Analysis ◽  
Power Systems ◽  
Large Scale ◽  
Voltage Stability ◽  
Sampling Technique ◽  
Coefficient Of Determination ◽  
Sampling Techniques ◽  
Quasi Monte Carlo ◽  
Efficient Sampling

This paper presents a comparative analysis of six sampling techniques to identify an efficient and accurate sampling technique to be applied to probabilistic voltage stability assessment in large-scale power systems. In this study, six different sampling techniques are investigated and compared to each other in terms of their accuracy and efficiency, including Monte Carlo (MC), three versions of Quasi-Monte Carlo (QMC), i.e., Sobol, Halton, and Latin Hypercube, Markov Chain MC (MCMC), and importance sampling (IS) technique, to evaluate their suitability for application with probabilistic voltage stability analysis in large-scale uncertain power systems. The coefficient of determination (R2) and root mean square error (RMSE) are calculated to measure the accuracy and the efficiency of the sampling techniques compared to each other. All the six sampling techniques provide more than 99% accuracy by producing a large number of wind speed random samples (8760 samples). In terms of efficiency, on the other hand, the three versions of QMC are the most efficient sampling techniques, providing more than 96% accuracy with only a small number of generated samples (150 samples) compared to other techniques.

scholarly journals PENGARUH KUALITAS PELAYANAN TERHADAP KEPUASAN KONSUMEN PADA PERUSAHAAN MASTER PIECE KARAOKE DI KOTA BENGKULU

2021 ◽  
Vol 9 (1) ◽  
pp. 50-58
Author(s):  
Yudi Irawan Abi
Keyword(s):  
Linear Regression ◽  
Data Collection ◽  
Service Quality ◽  
Multiple Linear Regression ◽  
Consumer Satisfaction ◽  
Sampling Technique ◽  
Coefficient Of Determination ◽  
Sampling Techniques ◽  
Analysis Tool ◽  
Test Result

The purpose of this study was to determine the effect of   tangible, reliability, responsiveness, assurance  and empathy of service quality to consumer satisfaction of Master Piece Karaoke in Bengkulu. The sampling technique in this study using purposive sampling techniques and data collection is done by distributing questionnaires to the respondents. The questionaires were distributed to the 100 respondent of Master Piece Karaoke in Bengkulu. The analysis tool used is multiple linear regression using SPSS 16. Hypothesis testing using the T test. Result shows that  partially, tangible, reliability, responsiveness, assurance  and empathy variables has significant effect on consumer satisfaction  of Master Piece Karaoke in Bengkulu. Based on the analysis of known coefficient of determination value of Adjusted R Square is  0.477, this means 47,7% variable consumer satisfaction is influenced by variables service quality.

scholarly journals Accurate and Efficient Explicit Approximations of the Colebrook Flow Friction Equation Based on the Wright ω-Function: Reply to the Discussion by Majid Niazkar

Mathematics ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 796
Author(s):  
Pavel Praks ◽  
Dejan Brkić
Keyword(s):  
Monte Carlo ◽  
Friction Factor ◽  
Large Scale ◽  
Optimization Procedure ◽  
Flow Friction ◽  
Quasi Monte Carlo

In this reply, we present updated approximations to the Colebrook equation for flow friction. The equations are equally computational simple, but with increased accuracy thanks to the optimization procedure, which was proposed by the discusser, Dr. Majid Niazkar. Our large-scale quasi-Monte Carlo verifications confirm that the here presented novel optimized numerical parameters further significantly increase accuracy of the estimated flow friction factor.

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