Fast Tracking Phase-Locked Loop Based on Complex Vector Form and Phase Difference Interval Judgment

Phase-locked loop guides the current phase angle for the converter. Fast phase angle tracking is important for the converter control effect and system stability. This paper proposes a fast tracking phase-locked loop based on complex vector form and phase difference interval judgment. The phase difference acquisition and loop control all adopt complex vector form. The phase difference interval is judged by the value and relationship of the real and imaginary parts of the phase difference complex vector. In order to speed up the phase angle tracking, the output of the phase-locked loop is compensated based on the interval judgment. The structure and the controller design of the proposed phase-locked loop are also illustrated in this paper. The simulations are used to verify the correctness and effectiveness of the proposed fast tracking phase-locked loop.