An Improved Detection Algorithm in Traction Power Supply System

In order to solve power quality problems such as negative sequence current and harmonics in traction power supply system, multiple integrated compensators are connected in substation, that can efficiently compensate harmonic current and make the three-phase current balanced. A fundamental positive-sequence component detection algorithm based on second-order complex-vector prefilter is proposed. The synchronous reference frames and low-pass filters could be reduced in the proposed method, so that the detection speed and effect could be improved. Experimental results on a laboratory prototype are given to demonstrate performance of the proposed approach during steady-state and dynamic operations.