Study of Capacitor Placement to Improve the Voltage Profile in Contingency Conditions of the 150 kV Madura Electricity Power System

Abstract

The contingency is a very important issue in the electricity power system security. The contingency impact can change voltage, particularly the voltage drop on the load bus. This condition can have an impact on the quality of power supplied to the load, system reliability, and system security. The solution to overcome the voltage drop is to improve the voltage profile through the injection of reactive power sources into the system. This study focuses on improving the stress profile when a contingency occurs in the electricity power system. The stabilization profile is improved by placing the capacitor in distribution and centrally on the electricity power system. Newton Raphson method is used to determine the power flow and voltage on each bus normal and contingency conditions. The results showed that the worst undervoltage impact occurred in scenario 7 where the value of the Sumenep bus voltage decreased to 132.4 kV and the value of the bus voltage of Pamekasan was 131.8 kV. the centralized capacitor placement method is carried out on the Sumenep bus with an injection of a negative power of 24.93 MVAR. the centralized capacitor placement method can increase the bus voltage profile above the standard minimum value used. the distributed capacitor placement method is carried out by measuring the reactive power on each bus Sumenep 24.93 MVAR, Sampang 29.78 MVAR, Bangkalan 50.85 MVAR, Gilitimur 67.41 MVAR. The results of the voltage profile show that the voltages of all load buses are above the standard. The voltage standard used is the Regulation of the Minister of Energy and Mineral Resources CC2.0: 2007 with a minimum voltage limit of -10%.