Static VAR Compensation Capacity for Bus Voltage Setting in Electric Power Systems

Abstract

Under certain operating conditions, the bus voltage can drop below its minimum limit. A large load can cause the voltage drop on the bus, or the bus location is far from the generating center, so a transmission line connects the bus line also located quite far. A static capacitor bank can improve voltage quality. This capacitor will compensate for the reactive power flow so that the current flowing in the network becomes low, and this can improve the voltage. This study proposes a compensation technique to control the bus voltage so that it is at its security limit. The methodology uses power flow based on the Newton-Raphson technique because this technique has powerful convergence compared to Gauss-Seidel and Fast Decoupled Techniques and capacitor modeling. The simulation results on the IEEE 9-bus system show different compensation rates for buses, such as bus 5 of 33.7 MVAR and bus 8 of 12.6 MVAR. In addition, losses fell about 1.5%.