Low Voltage Ride Through Control of Photovoltaic Inverter Under Unbalanced Fault
Considering that photovoltaic power system is usually running under conditions of power factor,which results in a certain waste of apparent power of PV inverters when the grid is under unbalanced fault.And according to the requirement for the response of the PV system during the fault,the control objective is to maintain the balance among three-phase grid-connected currents and suppress negative-sequence current,and therefore based on feedback control,positive and negative sequence dual current LVRT reactive control strategy is put forward.The reactive power current output depends on voltage drop,and PV inverter outputs reactive power to the grid during LVRT to support connection-grid voltage.The feasibility and effectiveness of the control strategy is verified by simulation and experiment on the RTDS.
photovoltaic inverterunbalanced faultlow voltage ride throughreactive controlreal-time simulation
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