Frequency adaptive phase-sequence separation method based on a generalized delayed signal cancelation method

A new frequency adaptive method for detecting the Fundamental Frequency Positive Sequence (FFPS) voltage vector is proposed in this paper. The analytical developments demonstrate that the proposed method allows obtaining the FFPS alphabeta voltage vector canceling the effects of fundamental-frequency negative-sequence components, as well as the influences of all harmonic voltage vectors up to 24th order and also dc offsets. A high bandwidth output synchronous reference frame phase locked loop (SRF-PLL) is then used for obtaining the amplitude and position of the fundamental frequency vector. A scheme for making the proposed method adaptive to input frequency variations is also presented. The proposed method performance is verified through simulations and experiments.