Abstract
In order to simulate and analyze the operation characteristics of the grid connected photovoltaic power generation system, dynamic modeling and simulation of grid-connected photovoltaic (PV) power stations were researched. First, a dynamic mathematical model for stability analysis of grid-connected PV power stations was established, considering maximum power tracking control, constant power control, etc. Second, a stability criterion was proposed for grid-connected PV power stations under the maximum power point tracking (MPPT) control mode. According to this criterion, the stability of the PV power system can be fully determined by using the PV array voltage and the measured power data; in the meanwhile, this criterion can provide theoretical basis for the implementation of stability detection and stability control. Finally, simulations were given to verify the validity and the feasibility of the proposed stability criterion and the dynamic model for PV power stations.
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