Exact inverter waveform analysis using z-transform estimation techniques

The critical limitations of Fourier transform analysis are reviewed. The frequency resolution and amplitude accuracy trade-offs implicit in techniques used to minimize the effect of these limitations are presented. The fundamental theory of exact, z-transform modeling that simultaneously offers excellent resolution and accuracy is discussed. The classical techniques used to estimate z-transform coefficients from the sampled data are presented, along with a discussion of their limitations. A new approach for z -transform estimation is developed theoretically, and experimental verification is demonstrated on a PC-AT-based signal acquisition system, using actual inverter waveforms