How to improve single-phase self-adaptive reclosing of high-voltage AC transmission line on the inverter side

摘要

To provide an improvement method of a single-phase self-adaptive reclosing circuit of a high-voltage ac transmission line on the inverter side.SOLUTION: A single-phase self-adaptive reclosing circuit of an overhead transmission line uses a current transformer to acquire a voltage of an inverter side current transformer bus in real time when a single-phase ground failure occurs, and uses a high-speed Fourier algorithm to calculate a voltage amplitude value U of the current transformer bus and calculate ΔU as a difference between a peak value and a valley value after the single-phase ground failure of the AC system on the inverter side has occurred, and the trip occurs. The ΔU and a set value G are compared, and the single-phase self-adaptive reclosing circuit is closed when the ΔU is larger than the set value G, and the single-phase self-adaptive reclosing circuit is opened when the ΔU is smaller than the set value G to distinguish a temporary failure and a permanent failure.SELECTED DRAWING: Figure 1