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Mahmoud N. Ali
Benha University

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Fuzzy Logic PSS Assisted by Neighboring Signals to Mitigate the Electromechanical Wave Propagation in Power Systems Mahmoud N. Ali
Indonesian Journal of Electrical Engineering and Computer Science Vol 14, No 3: June 2015
Publisher : Institute of Advanced Engineering and Science

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This paper deals with the mitigation of electromechanical wave propagation in power systems. Different conventional controllers addressed this problem, such as the conventional PSS and the conventional fuzzy logic PSS. In this paper, the fuzzy logic PSS is assisted by auxiliary signals from the fuzzy logic PSS of the interconnected machines to augment the damping of electromechanical wave propagation and the associated oscillations. The neighboring machines speed deviation and its derivatives signals are exploited through the fuzzy logic PSS to assist the local fuzzy logic PSS. The disturbance propagation and reflection phenomena are considered in the design of the adopted strategy. The efficacy of the proposed assistance of the conventional fuzzy logic PSS are examined through different simulation results. DOI: http://dx.doi.org/10.11591/telkomnika.v14i3.7837
Effective Factors on the Generated Transient Voltage in the Wind Farm due to Lightning M. A. Abd-Allah; Mahmoud N. Ali; A. Said
Indonesian Journal of Electrical Engineering and Computer Science Vol 13, No 1: January 2015
Publisher : Institute of Advanced Engineering and Science

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Abstract

According to reports that had been published in many papers, wind turbines (WTs) fault due to lightning is one of the most difficult challenges. Lightning overvoltage lead to malfunction in the wind farm equipments. These improper functioning contain of malfunction electronic equipments and deformation of transformer winding and Surge arrester failures. The travelling waves which are generated due to high ground potential rise under lightning struck turbine cause these problems. To evaluate these cases, it must be performed an accurate analysis on the wave shape and level of the Lightning overvoltage and ground potential rise. This paper investigates the effective factors on the wave shape and level of the overvoltage, GPR and surge arrester burnout. These factors are included impulse Current-second characteristics, position of lightning, inception angle, multiple lightning strokes and chopped current.  ATP-EMTP simulation program is applied to analyze the lightning over-voltage of onshore wind farm. This paper provides a practical procedure of lightning protection. DOI: http://dx.doi.org/10.11591/telkomnika.v13i1.6844
Co-Authors A. Said M. A. Abd-Allah