1295

Synchronous reference frame phase-locked loop (SRF-PLL) is a classical method to achieve grid synchronization in three-phase systems, and it significantly affects on the stability of weak grids. Many linearized models have been established to describe the performance of PLL. However, the low dynamic accuracy in the case of frequency jumps has been the common issue for those models. To address that, an accurate linearized model for the SRF-PLL is proposed in this letter, which has good dynamic accuracy in the case of frequency jumps and phase angle jumps. In detail, a nonlinear model of SRF-PLL is established. Then, a simplified model is obtained according to the accurate linearization technology. Compared with the traditional prior-art models of the SRF-PLL, the proposed model has better dynamic accuracy, especially in the case of frequency jumps.