AC Fault Ride-Through Characteristics Analysis and Parameters Optimization of Large-Scale Photovoltaic Power Transmission System via VSC-HVDC
In order to study the influence of AC faults on the DC voltage and active power of large-scale photovoltaic(PV)power transmission system via voltage source converter based high voltage direct current(VSC-HVDC)during the fault ride-through process,a modeling and analysis method based on equivalent controlled current source model is proposed.Firstly,the AC fault ride-through characteristics of the large-scale photovoltaic power transmission system via VSC-HVDC are qualitatively analyzed,and the influence of AC-side fault at the sending-end on the DC voltage of the VSC-HVDC is indirectly translated into the research of the ac-tive power characteristics of the system.Then,based on the operation control characteristics of the PV side inverter and the sending-end converter station during the fault,the equivalent controlled current source model of the whole system is established to explore the influence of the current setting value of the PV side inverter and the current limiting value of the sending-end converter station on the active power transmission characteristics,and then the optimal design method of the current parameters of the PV side inverter and the sending-end converter station during the fault period is proposed.Finally,the effectiveness of the proposed method is verified by PSCAD/EMTDC simulation.
photovoltaic powerVSC-HVDCfault ride-throughequivalent controlled current source model
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