Grid Synchronization during Non-Ideal Grid Conditions Based on Double Integration Method

Mohannad Jabbar Mnati, Kamran Hasan, Alex Van Den Bossche

Abstract


Modular multilevel converter (MMC) has numerous advantages already discussed in the literature. Grid voltage synchronization is a critical component of grid-connected power converters. Synchronous reference frame (SRF)-PLL traditionally synchronizes MMC voltage to the grid. However, non-ideal grid circumstances induce phase angle inaccuracies since phase angle is obtained by integrating grid frequency. The three-phase dual integration method (DIM) is used in the grid synchronization of a three-phase MMC inverter in this study. It integrates grid phase voltage twice to generate reference signals for the MMC grid side converter. Furthermore, it enables a smooth start during balanced and non-ideal grid conditions a) voltage unbalance; and b) frequency unbalance, as the generated signal remains in phase with the current. The proposed process reduces THD to almost less than (< 0.09%). The simulation results demonstrate the suggested method's efficacy in grid synchronization.

Keywords


SRF-PLL; HVDC; Grid synchronization; Transmission system; Power converter.

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References


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DOI (PDF): https://doi.org/10.20508/ijrer.v15i1.14733.g9029

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