A Harmonic Source Tracing Method Robust to Strong Noise Based on Fuzzy Logic

As renewable energy sources are increasingly integrated into power grids, harmonic source tracing is essential for the monitoring and suppressing of harmonic pollution. A fuzzy logic inference system can easily achieve harmonic tracing, but it relies on line parameters at each harmonic. In this paper, a wideband harmonic parameter estimation model is established and solved by weighted least squares (WLS). To overcome the lack of a basis for adjusting the weight matrix W and the inability to adapt to changes, an adaptive adjustment system using fuzzy inference methods was also developed to obtain wideband line parameters, and harmonic tracing can be achieved using only measured data. The above process was tested on the IEEE 14 Bus System, which proved the feasibility of the proposed solution.