Secondary Voltage Control of a Multi-region Power System

This paper presents schemes to perform secondary voltage control on the IEEE 39 bus system. The power system simulation and analyses are performed using DIgSILENT software. The tertiary voltage control is applied based on power system optimization process. The secondary voltage control is applied on the simulated system by three different schemes: scheme 1 is using a built-in function in DIgSILENT (station control facility), scheme 2 is establishing a new control model in the software application and scheme 3 is integrating DIgSILENT and MATLAB applications. A comparison between system performance using those three different schemes under different operating conditions is presented. The comparison shows that schemes 2 and 3 are identical and achieved better performance than the first scheme in terms of total power losses and voltage deviation index. A graphical theory algorithm is applied for power system partitioning and sensitivity analysis is used in pilot buses selection which proved their effectiveness through results.