Before connecting two large power systems for the first time, it is necessary to perform simulation studies to ensure that the synchronization process can be achieved successfully. This paper presents simulation studies and practical records of the synchronization and operation of Oman and United Arab Emirates electric power systems. The synchronizing process consists of the step-by-step actions to be implemented by the operators in order to energize the new equipment and synchronize both systems in a successful and secure way, taking into account the capability of the installed and available equipment of the grid, power producers and consumers. Synchronizing scenarios are simulated with the EUROSTAG tool, assessing on the one hand, the adequacy of the ampacity of grids’ equipment and the voltage on each node with their operational limits, and on the other hand, the stability and the electromechanical behavior of the whole system after each step of the synchronization process. Simulations are performed at minimum load conditions. It is usually more critical than for peak load conditions since fewer units will be operated to absorb the reactive power generated by the energized interconnection and there is a lower synchronizing torque to secure and damp the synchronization transients. Based on the simulation results, recommendations are made for the settings of the synchro-check automaton installed in the interconnection substation (maximum voltage amplitude, voltage angle and frequency deviations). Practical records of system frequency and emergency power exchange are presented to demonstrate the improvement in system performance after interconnecting the two systems.

Before connecting two large power systems for the first time, it is necessary to perform simulation studies to ensure that the synchronization process can be achieved successfully. This paper presents simulation studies and practical records of the synchronization and operation of Oman and Unite...