Voltage quality in delta Egypt network and its impact in oil industry

The electrical energy is transmitted from the generating stations to the consumers through a transmission network. The effectiveness of improving voltage profile yields high transmission network efficiency and increase the capacity of transmission lines, also decrease power losses, voltage drop and unplanned shut down in the big industrial and strategic loads like (oil refining industry). This paper objective presents the suggested solutions for improving voltage profile in electrical network of delta Egypt to achieve a voltage quality. The methodology of suggested solutions are applied on delta Egypt network with voltage levels (66, 11, 6.6, 0.4) kV, the simulations were performed using digital simulation and electrical network calculation (DIgSILENT power factory software) to study the voltage profile. The validation of results was performed by comparing the voltage profile of proposed four different scenarios: 1st: power flow in normal operation (without using any voltage improving devices), 2nd: using Automatic Tap Changer (ATC) of transformers, 3rd: installing a Static Volt Ampere Reactive (VAR) System(SVS) with (ATC), 4th: installing a (SVS), (ATC) and shunt reactive power compensation devices (parallel capacitor / inductor). The best voltage profile achieved by using scenario 4, which supported and improved the voltage profile of all system and brings the magnitudes of all buses in permissible voltage level from (0.79-0.99 P.U.) at normal operation (scenario 1) to (0.9-1.04 P.U.) at (scenario 4). So the system can be operated with more efficiently, stability and improving the capacity of the network after applying the solution stated in scenario 4. • This paper studied the voltage profile in delta Egypt network. • A relation between voltage quality and catastrophic events in oil refining industry. • High quality grid must have voltage stability with in accepted levels at each bus. • Network construction was performed by (DIgSILENT power factory software). • The voltage profile was performed by proposed four different scenarios. Scenario 1: power flow (PF) study in normal operation (base case). Scenario 2: (PF) study using automatic tap changer (ATC). Scenario 3: (PF) study using (ATC)& static Var system (SVS). Scenario 4: (PF) study using (ATC), (SVS) and shunt reactive power control devices. • A comparison between all scenarios results have done to get the optimum solution. • The best voltage profile had achieved by using scenario 4.