Economic reactive power compensation of the railway power line

An economic reactive power compensation approach for the railway power line is proposed in this paper. With simulation based on PSCAD/EMTDC platform, the peculiarity of only inductive reactive power compensation is needed for the power through line revealed, which means dynamic compensation devices are not necessary, although the reactive power characteristic of the all cable power through line switches between capacitive and inductive under different load rates. Compensate reactive power for the feeder substation and the power through line respectively can avoid the frequent transfer of reactive power between the feeder substation and the power through line to impact each other. The combination of distributed compensation reactors and concentrated adjustable compensation reactors can not only improve the power factor of the incoming line, but also smooth the voltage along the power through line, to meet the requirement of power quality. The approach is verified feasible in practical operation.