Detecting methods of reactive power and harmonic current in electrified railway systems

In order to detect the reactive power current and harmonic current in electrified railway systems,two detecting methods are proposed in this paper.There are methods based on function orthogonal characteristic and active current separate method.The corresponding detection systems are developed,and simulations based on power quality data of Yiliang traction which detected by BDC-5 traction substation power quality detecting system are performed which verify the feasibility of the methods proposed.With higher precision and the real-time performance,two methods are recommended in electrified railway systems.