Harmonic Source Localization Based on the Joint Entropy Method

This paper presents a new strategy for harmonic current sources localization in power systems. Based on the fast independent component analysis method, the harmonic current profiles are calculated according to the measured voltage data. Then the slow variations associated with the load patterns are separated based on the moving average filter. Seeking low computational complexity, dimensionality reduction is realized by using the fast independent component analysis. To accurately and effectively locate the harmonic source with minimal measured voltage, the joint entropy method is used based on a threshold value and localization algorithm, which can locate multiple harmonic sources without any additional inputs, i.e., the system harmonic impedance and topology. Computational simulations are conducted employing the IEEE 37-bus test system by taking account of three different harmonic sources, i.e., residential, commercial, and office harmonic sources, and simulation results in IEEE-37 test system verify the accuracy, validity, and efficiency of the proposed method.