期刊
PROCESSES
卷 11, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/pr11092634
关键词
flexible DC transmission; PLL; unbalance voltage; harmonic voltage; DC bias; power quality
This paper proposes a PLL strategy adapted to extremely harsh grid conditions, which achieves real-time regulation of harmonic signals and adaptive tracking of grid phase by introducing repetitive control internal model and eliminating DC bias.
High-voltage flexible power systems, with their intrinsic characteristics, play an increasingly important role in electronic power systems. Synchronization between the inverter and the grid needs to be achieved by a phase-locked loop (PLL), the performance of which determines the quality of power transmission. This paper proposes a PLL adapted to extremely harsh grid conditions. Firstly, the traditional synchronous reference frame PLL and the dual second-order generalized integrator (DSOGI-PLL) are analyzed, and the errors in phase-locking and the shortcomings of these two methods in the presence of DC components in the grid are pointed out. Secondly, based on the harmonic grid voltage, a repetitive control internal model is introduced by DSOGI to realize the real-time tracking and regulation of the harmonic signals in order to suppress the harmonic voltage disturbance. In addition, a DC bias elimination and frequency adaptive method is proposed to solve the problems of DC bias and grid voltage frequency fluctuation in order to achieve adaptive tracking of the grid phase. Finally, the superiority of the proposed strategy is verified through simulations and experiments.
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