| Citation: | LIU Yuzhi, ZHANG Xinyu, BIAN Jianpeng, et al. Synchronization optimization method of adaptive frequency-locked loop without DC component interference[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(9): 1798-1804. doi: 10.13700/j.bh.1001-5965.2016.0672(in Chinese)
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Grid synchronization is one of the key technologies to improve the fault ride-through capability for grid-connected converter. To achieve fast and accurate phase or frequency tracking under unbalanced grid voltage, a kind of improved first-order generalized integrator based on frequency-locked loop (FOGI-FLL) method is put forward. A mathematical model of grid-connected converter is established. Its separation principle of positive and negative sequences under unbalanced grid is also analyzed. The separation structure of fundamental negative and positive sequence components is simplified. Its core module configuration of FOGI is discussed. Integral compensation function which can eliminate the interference of DC components for FLL tracking is parallelly added to the basic structure of FOGI filter. Finally, the proposed method is verified by contrast simulation under unbalanced grid voltage with DC components. Simulation results present that the proposed method is capable of achieving better performance for synchronization under unbalanced grid voltage.
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