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El-Amin I.M.,King Fahd University of Petroleum and Minerals | Ahmed M.K.,Saudi Electricity Company
2014 International Symposium on Power Electronics, Electrical Drives, Automation and Motion, SPEEDAM 2014 | Year: 2014

This paper presents the common problems encountered in a Photovoltaic (PV) connected power grid, with a special focus on the voltage profile at the point of common coupling (PCC) between a PV and a distributed generation (DG) system. This is achieved through simulations and modeling. Voltage control methodologies have been proposed to deal with the problem of increased voltage at PCC and the nearby bus bars. The harmonic impact of PV power integration at the PCC is analyzed and a three phase harmonic filer is designed to mitigate the total harmonic distortions. The investigated system performance is improved using a solar tracker control technique and using a DC-DC converter. © 2014 IEEE. Source


Al-Mohammed A.H.,Saudi Electricity Company | Abido M.A.,King Fahd University of Petroleum and Minerals | Abido M.A.,Menoufia University
The Scientific World Journal | Year: 2014

This paper presents a comprehensive survey on transmission and distribution fault location algorithms that utilize synchronized measurements. Algorithms based on two-end synchronized measurements and fault location algorithms on three-terminal and multiterminal lines are reviewed. Series capacitors equipped with metal oxide varistors (MOVs), when set on a transmission line, create certain problems for line fault locators and, therefore, fault location on series-compensated lines is discussed. The paper reports the work carried out on adaptive fault location algorithms aiming at achieving better fault location accuracy. Work associated with fault location on power system networks, although limited, is also summarized. Additionally, the nonstandard high-frequency- related fault location techniques based on wavelet transform are discussed. Finally, the paper highlights the area for future research. © 2014 A. H. Al-Mohammed and M. A. Abido. Source


Al-Mohammed A.H.,Saudi Electricity Company | Abido M.A.,King Fahd University of Petroleum and Minerals | Mansour M.M.,King Fahd University of Petroleum and Minerals
International Conference on Intelligent Systems Design and Applications, ISDA | Year: 2011

This paper investigates the application of differential evolution (DE) algorithm for the problem of optimal placement of phasor measurement units (PMUs) in an electric power network. The problem is to determine the minimum number of PMUs and their respective locations to make the system observable. In order to cope with the continuous changes in the power system's topology, the optimization problem is formulated considering not only the new PMUs to be installed but also the existing ones to be retained or relocated. Additionally, the new formulation takes into account the locations, if any, at which PMUs shall or shall not be placed. The effectiveness of the proposed method is verified via IEEE 14-bus, 30-bus, 39-bus and 57-bus standard systems. © 2011 IEEE. Source


Al-Mohammed A.H.,Saudi Electricity Company | Abido M.A.,King Fahd University of Petroleum and Minerals
2014 IEEE International Workshop on Applied Measurements for Power Systems, AMPS 2014 - Proceedings | Year: 2014

This paper presents a fully adaptive fault location algorithm for three-terminal lines based on synchronized phasor measurements obtained by Phasor Measurement Units (PMUs). The proposed algorithm utilizes only PMU synchronized measurements and does not require any data to be provided by the electric utility. Line parameters for each section of the line and Thevenin's equivalents (TEs) of the system at each of the three terminals are determined online, utilizing three independent sets of pre-fault PMU measurements. This ensures that the actual operating conditions of the system are adequately considered. Fault-location accuracy evaluation of the proposed algorithm is performed with respect to various factors such as fault position and fault type. The proposed algorithm is simulated using both PSCAD/EMTDC and MATLAB and tested on a 500 kV system. Simulation results reveal that the developed algorithm is capable of producing reliable and very accurate solutions. © 2014 IEEE. Source


Alismail M.,Saudi Electricity Company
American Society of Mechanical Engineers, Power Division (Publication) POWER | Year: 2014

The circulating water system is a very important system in Ghazlan Steam Power Plant-4276 MW, as it supplies the sea water to the tubes side of the Condensers during normal operation. A large butterfly cross-connect valve was installed at the circulating water pumps discharge header to isolate the pumps and the header for maintenance. A forced unit shutdown occurred due to valve's shafts end leakage and collapse after maintenance work. This paper explains the wrong design location of the valve in the piping as the root cause of the problem. Analysis with ASME reference will be presented. This paper will also present potential solutions and actions taken as a lesson learned to avoid occurrence in other plants. Copyright © 2014 by ASME. Source

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