Analysis on power factor improvement of the 110 kV power supply system in pump station

A reactive compensation strategy, which takes the charging power of the circuit into consideration, is put forwardfor the pump stations with the transmission voltage at 110 kV and over. Under this strategy, the π-shaped equivalent circuitof the electric transmission line is used to calculate the reactive power distribution in the line, and a mathematic model isestablished by taking the minimum reactive power measured by the superior substation as the objective function. Then, theused capacity of the reactive compensation device is reduced to make the oil transportation station operate at the low powerfactor and increase the inductive reactive power of the station, when the station runs at no or light electric load. In this way, the charging power of the circuit is offset, the reverse reactive power is controlled, the power factor is enhanced and thepower expenses are decreased.