July 2013

Anti-islanding protection based on voltage and frequency analysis in wind turbines units

This paper introduces a new islanding detection algorithm method based on voltage and frequency analysis for wind turbines as distributed resource units at the distribution voltage level. The proposed method is based on processing of the rate of change of q-axis component of voltage and accelerates of change of frequency. This method detects the islanding conditions with the analysis of these signals. The studies...

Author(s): Behrooz Sobhani and Noradin Ghadimi

July 2013

A method for placement of distributed generation (DG) units using particle swarm optimization

Nowadays, the penetration of distributed generation (DG) in power networks takes special place worldwide and is increasing in developed countries. In order to improve voltage profile, stability, reduction of power losses etc, it is necessary that, this increasing of installation of DGs in distribution system should be done systematically. This paper introduces an optimal placement method in order to sizing and sitting...

Author(s): Noradin Ghadimi

July 2013

Adaptive neuro-fuzzy inference system (ANFIS) islanding detection based on wind turbine simulator

This paper presents a passive islanding detection method based on means of a neuro-fuzzy approach for wind turbines. Several methods based on passive and active detection scheme have been proposed. While passive schemes have a large Non detection zone (NDZ), concern has been raised on active method due to its degrading power quality effect. Reliably detecting this condition is regarded by many as an ongoing challenge as...

Author(s): Noradin Ghadimi and Behrooz Sobhani

July 2013

Application of regression and multiple correlation analysis to morning hours solar radiation in Lapai

Solar radiation in Lapai within the morning hours has been estimated by correlating meteorological parameters. This was achieved by applying the first and second order regression and multiple correlation analysis method. The correlation coefficient based on the first and second order equations in temperature and relative humidity were 0.828, 0.692, 0.860 and 0.622 while the correlation coefficient based on the multiple...

Author(s): Agbo G. A., Alfa B., Ibeh G. F. and Adamu I. S.