Parametric Algorithms for Frequency Calculation in PWM Converters Systems

Abstract

Proper estimation of voltage parameters has a significant meaning for power converters control systems. One of the measured parameter, directly associated with control process, is frequency of basic component. Unfortunately, power converters generate wide spectrum of harmonics as well as interharmonics, that makes difficult in estimation of frequency of basic component. Measurement carried out in industrial applications exhibits complex nature of investigated signals often corrupted by resonances or overvoltages phenomena. It entails searching a new digital algorithms for frequency measurement. This work presents algorithm using modification of high-resolution Prony method coupled with digital filtering. The investigations was based on real measured signals recorded in two different commercial PWM converters systems. Obtained results indicate accuracy of the method as well as its fast response.