Comparison of Voltage Stability Index Before and After Wind Turbine Penetrated to Sulseltrabar Interconnection Power System Using Modal Analysis Method

Voltage stability problems and renewable energy penetration in power systems are the main issues in the electric power system at this time. This paper aims to examine the condition of voltage stability at the time before and after the entry of wind power plants in the sulseltrabar interconnection system. There are two wind power-generating units that will be studied, namely the PLTB Sidrap with a capacity of 75 MW and the PLTB Jeneponto with a capacity of 72 MW. The simulation using Matlab program. From the simulation results, it can be seen that Sulseltrabar's voltage stability interconnection system at the time of the entry of PLTB Sidrap and PLTB Jeneponto, has improved stability, this can be seen from the eigenvalue and bus participation factor values. From the minimum eigenvalues it can be seen that the penetration of PLTB Jeneponto is slightly better than PLTB Sidrap in improving voltage stability. The condition that has the greatest influence on improving stability is when the two wind power plant enter to the Sulseltrabar interconnection power system.