Sensitivity Analysis of 20 kV Distribution System Under Fault Condition

Load shedding is conducted when there is imbalance in electric power system. The aim of load shedding is to stabilize voltage and frequency until tolerance limits allowed. It is based on State Electricity Company (PLN) standard of +5% and -10% change from the nominal voltage value of 20 kV distribution system. This paper presents a sensitivity analysis using dV/dQ approach based on load shedding. Load shedding was conducted in bus which had the highest sensitivity, so the voltage was able to increase significantly. The data used in this paper were taken from on site 20 kV distribution system with 5 feeders. We simulations with 2 scenarios. The first is aimed to capture the voltage and reactive power. The bus sensitivity and load shedding are then obtained based on the simulation results. The second is load shedding mechanism to observe the voltage response. Based on our results, the sensitivity of each feeder is about 0,0325 for Pattimura feeder, 0,0343 for Bunul feeder, 0,0319 for Zaenal zakse feeder, 0,02 for Jodipan feeder and 0,0189 for Lowokwaru feeder respectively.