A SVD-Based Dynamic Harmonic Phasor Estimator With Improved Suppression of Out-of-Band Interference

The diffusion of nonlinear loads and power electronic devices in systems deteriorates the signal environment, increases difficulty measuring harmonic phasors. Considering accurate phasor information is necessary to deal with related issues, this paper focuses on realizing dynamic estimation when contaminated by certain interharmonic tones, i.e. out-of-band interference (OBI). Specifically, work introduces singular value decomposition into Taylor-Fourier transform algorithm, deriving a general form for filters, yielding set adjustable parameters. Then these parameters are configured minimize negative influence OBI filters. Based recommended parameter values, optimized estimator obtained, then tested under signals distorted OBI, harmonic, noise, worse cases, frequency deviation, some conditions. Test results show proposal achieves good even multiple interferences scenarios, has much weaker dependence tones compared conventional approaches.