Abstract
This paper proposes an advanced hybrid control method to enhance low voltage ride-through (LVRT) capability of grid connected photovoltaic (PV) power plants. Using the proposed method, when a low voltage fault occurs at the point of common coupling, the grid connected inverter overcurrent and its DC-link overvoltage can be effectively suppressed by tuning the PV array output power and triggering the flux coupling fault current limiters (FCLs). The AC-side voltage sag of the inverter can be significantly mitigated by generating reactive power from the inverter and injecting this into the FCLs. Employing the proposed method can also reduce the regulating quantity of output power from the grid inverter and effectively improve PV system dynamic recovery. DC-link voltage fluctuations can also be significantly smoothed by the application of feed forward compensation and the FCLs. Related theoretical derivation and simulation analysis under various scenarios, including asymmetric faults, confirm that the proposed control method can not only enhance the LVRT capability but also strengthen the transient performance of PV systems.
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