Refined Real-time Simulation Modeling at the Unit Level for Large-scale PV Power Stations
The construction of large-scale photovoltaic(PV)power stations is the mainstream trend of photovoltaic development,supporting the realization of"carbon peaking and carbon neutrality goals".However,huge amounts of PV power units intensify the contradiction between"complex model calculations"and"limited simulation resources",which makes it face great difficulties in the refined real-time simulation.In this paper,the refined real-time simulation modeling at the unit level for large-scale PV power stations is proposed.First,the working principle of the PV array is analyzed,and the circuit calculation form of"voltage→ current"is rewritten to the iterative update form of"historical current source + change amount",and then the large-time-scale correction of electrical parameters and historical sources is combined to achieve low computational complexity modeling.Next,the switch function model of the inverter is used to separate the AC and DC matrix solution.The DC circuit is solved independently and the AC circuit eliminates nodes to obtain the definite admittance equivalent model of the PV power unit.Finally,the accuracy of the proposed model is verified on the RTDS platform and realizes the real-time simulation of the PV power station with hundreds of units.
large-scale photovoltaic power stationphoto-voltaic power unitreal-time simulationrefined modeling
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