| 摘要 |
PURPOSE:To perform the Q control in the overall operation period of a reactive power compensator SVC by detecting the load current supplied to a train load by a local equipment in both of the normal feed period of feed from its own substation and the parallel feed period of feed from its own substation and adjacent substations in the case of the Q control where a specific substation of a feeding system is provided with the SVC and the variance of the reactive power supplied to the train load by the local equipment is compensated to suppress the variance of voltage. CONSTITUTION:A subtracting circuit 13 which takes out outputs of a current transformer CT1 which detects an output current I1 of a feeding transformer 2 of a local substation A and a current transformer CT2 which detects an SVC current I2, in an arbitrary ratio and calculates the difference I1R1-I2R2 to obtain a load current ILA is provided. In the normal feed period, this ratio is set to R1:R2=1:1; and in the parallel feed period, it is set to R1:R2=(ISVCA+ISVCB):ISVCA based on an inflow ratio ISVCA/ISVCA of SVC currents from substations A and B determined by a system condition. |
