Initial results in Prony analysis for harmonic selective active filters

In this paper, Prony analysis is implemented in harmonic selective active filters for power quality improvement. Unlike existing harmonic selective active filters, which require prior knowledge of harmonics and have limited reference generation ability for exponential decay in harmonics, the Prony analysis based active filters can identify frequencies, magnitudes, phases and even damping factors of harmonics. The dominant harmonics identified from Prony analysis are used for the harmonic reference generation for the harmonic selective active filters for power quality improvement. An appropriate Prony algorithm is selected for its best overall performance for harmonic selectivity. Simulation results from stationary and nonstationary harmonic cancellation verify the power quality improvement of a test system by the Prony analysis based harmonic selective active filter. The initial results in Prony analysis for harmonic selective active filters can be used in other applications to improve power quality