The Studies on Power System Harmonic Analysis based on Extended Prony Method

A new harmonics analysis method based on extended Prony method and distributed Ethernet network is proposed. The new method uses an extended Prony algorithm to estimate the amplitudes and phase angles from the distorted currents in power systems. The extended Prony algorithm uses a linear combination of exponential functions to imitate signals. It can calculate the amplitudes, phase angles, damp ratios and frequencies of harmonics. The mathematic model of the extended Prony method is introduced and the new harmonic analysis method is given in detail. In order to improve the accuracy of harmonic source identification, Global Positioning System (GPS) is used as the synchronized signal for the embedded measurement system based on digital signal processor (DSP). The hardware structure of the embedded harmonic identification system and harmonic monitoring system network layout are given. RTDS simulation results prove the effectiveness of the new method.