Riyadh, Saudi Arabia
Riyadh, Saudi Arabia

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Ishaq J.,Saudi Electricity Company SEC | Fawzy Y.T.,International Power | Buelo T.,SMA Solar Technology AG | Engel B.,SMA Solar Technology AG | And 2 more authors.
2016 IEEE International Energy Conference, ENERGYCON 2016 | Year: 2016

In this investigation, some strategies are presented for the optimized provision of reactive power by photovoltaic (PV) systems to perform voltage regulation in a low voltage distribution grid. The optimization is based on an optimal power flow algorithm that determines the minimum amount of reactive power needed for voltage regulation, also resulting in the minimization of losses in the network. In addition to solving overvoltage problems caused by high penetration of PV systems, reactive power exchange with the superimposed medium voltage grid is also minimized. This is accomplished by performing reactive power balance with respect to a power factor set-point at the interface of medium (MV) and low voltage (LV) grids. In one strategy, the benefits of voltage support provided by battery-based energy storage system (BESS) in parallel to PV systems are also presented. © 2016 IEEE.


Rehman S.,King Fahd University of Petroleum and Minerals | Alhems L.M.,King Fahd University of Petroleum and Minerals | Soufi K.Y.,King Fahd University of Petroleum and Minerals | Al Faraj B.A.,Saudi Electricity Company SEC | And 6 more authors.
34th Electrical Insulation Conference, EIC 2016 | Year: 2016

The study presents the results of experimental investigation of finding out the limit concentrations of DBDS and sulfur mercaptan for safe and prolonged operation of power transformers in the local environmental conditions of Saudi Arabia. For experimental investigation of limit concentrations of DBDS and sulfur mercaptan, new oil free of sulfur compounds was acquired. Four specimens of this were spiked with 2.2, 3.9, 5.4 and 10.2 ppm of DBDS and another four with free sulfur mercaptan RSH concentrations of 0.00, 0.52, 1.07, 2.13, and 7.10 ppm. The covered conductor deposition (CCD) tests were performed in accordance with IEC 62535 method on all the specimens. The experimental results indicated that the concentration of DBDS should always be <5 ppm and sulfur mercaptan <1 ppm in the new oils before putting in to the service. © 2016 IEEE.


El-Amin I.M.,King Fahd University of Petroleum and Minerals | Ali M.S.,Saudi Electricity Company SEC
2011 IEEE PES Conference on Innovative Smart Grid Technologies - Middle East, ISGT Middle East 2011 | Year: 2011

This paper reports on the development of an integrated model of a PV system that is connected to a 7-bus distribution network. The system modeled in this work consists of five major sub-systems they are: PV generator model, Charger Unit, Battery, Inverter and the distribution system. The mathematical model is used for steady-state simulations to evaluate the effectiveness of battery-integrated PV system on avoiding over voltage problems. Furthermore, fault analysis is done to study the effect of the PV model on the utility network during symmetrical and asymmetrical faults. © 2011 IEEE.


Abdel-Aziz E.Z.,Saudi Electricity Company SEC | Ishaq J.,Saudi Electricity Company SEC | Al-Khulayfi A.M.,Saudi Electricity Company SEC | Fawzy Y.T.,International Power
2016 IEEE International Energy Conference, ENERGYCON 2016 | Year: 2016

Power transmission systems with high proportion of motor loads may undergo voltage recovery problems in the event of a system contingency. After a disturbance, motors may stall and delay the voltage recovery process by consuming substantial amount of reactive power. It has been presented in this study that the inability of power systems to meet reactive power demand during such contingency conditions can be overcome through photovoltaic (PV) systems. With the provision of reactive power by PV systems, static and dynamic voltage stability of a local network of Saudi Electricity Company (SEC) improved by ensuring fast recovery of post-fault voltage at the motor load terminals. The improvement in voltage stability has been validated through voltage stability indices and the prevention of motor stalling cases. The performance of a large scale PV system is also compared with the fast-acting dynamic reactive power sources such as static VAR compensator (SVC) and static synchronous compensator (STATCOM). © 2016 IEEE.

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