The application of FBD current examination method in the three-phase power system

In three-phase electrical power system, in order to compensate and control the harmonic current and the reactive power more effectively, this paper proposed a electric current testing method which is based on the method of FBD. This method can be used to detecting the fundamental wave’s negative sequence current, the fundamental wave’s zero-sequence current, the harmonic current and so on. The FBD mehod, compared with the other electric current testing method based on the instant reactive power theory, is more useful in the same situationcan. The result of PSCAD simulation has indicated the validity and the accuracy of this electric current testing method.