Adaptive Detecting Method for Fundamental Positive Sequence, Negative Sequence Components and Harmonic Component Based on Space Vector

Based on the concept of space vector, an adaptive detecting method for fundamental positive and negative sequence components and harmonic components is proposed in this paper, and a detailed theory analysis has also been done. The results show that for fundamental component detecting loop, the proposed adaptive detecting method is equivalent to an ideal second order band-pass filter, while for harmonic detecting loop the proposed detecting method is equivalent to an ideal second order notch-filter. When the input signal is seriously distorted, in order to eliminate the effects of the higher order characteristic harmonics on the detecting precision, low pass filters are added in series with an integrator to reduce the variation of weights generated by high order harmonics. Both theory analyses and simulation results have proved the validity of the proposed method