Location of Multi-harmonic Source Based on FAJD Method
Wei Li, Dingjiang Fang, Wenbing Wu, Kai Ding, Xiaoyang Ma, Rui Xu · 2020
With a large number of non-linear load connecting to the power system, power quality problems such as harmonics become increasingly serious. Hence, accurately identifying the location of the harmonic source is of great significance. Since the existing location methods display poor accuracy and the prior conditions of the location are difficult to obtain, this paper presents a new method of harmonic source location. First, fast-approximate joint diagonalization method (FAJD) is used to estimate the harmonic current. Compared with the independent component analysis (ICA), it does not need to whiten the measured data, so the error during this process is eliminated and the solution accuracy of the source signal as well as the mixing matrix is improved. Then, through the sequence identification, the precise location of the harmonic is obtained by matching the mixing matrix with the columns of the matrix which is related to the system topology. The IEEE 39-bus system is used to verify the method and compared it with the ICA algorithm. The simulation results show that the proposed method has high accuracy in harmonic source location.