The article proposes an improved MPPT low voltage ride-through control strategy
which not only considers the influence of reactive power on voltage recovery
but also analyzes the influence of power change on the frequency of microgrid from the perspective of frequency recovery during LVRT. This strategy decouples the MPPT control
allowing the photovoltaic panels to quickly track the voltage corresponding to the maximum power point after a fault recovery. This enables faster attainment of the maximum power output
thereby facilitating the rapid restoration of grid frequency. Through experimental comparative analysis
the article examines the photovoltaic output voltage
inverter power output
and changes in grid frequency during the low voltage ride-through process under the improved MPPT strategy and traditional FPPT control. The results demonstrate the superiority of the improved strategy in supporting grid frequency.
KJAER S B, PEDERSEN J K, BLAABJERG F.A review of single-phase grid-connected inverters for photovoltaic modules[J]. IEEE transactions on industry applications, 2005, 41(5): 1292-1306.
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