Overall Parameter Identification Method for Photovoltaic Inverters Based on Low Voltage Ride-Through Characteristics

To accurately construct the low-voltage ride-through control for the photovoltaic electromagnetic transient model, this study proposes an overall inverter parameter identification method based on low-voltage ride-through (LVRT) characteristics. First, based on the typical inverter control structure, the control modes and their corresponding control parameters for different voltage sag levels are clarified. Then, using the measured active and reactive currents, the control parameters for the inner and outer loop controllers are identified via the Differential Evolution (DE) algorithm. The command parameters of the control strategy are identified using multivariable linear regression based on the least squares method. Finally, a photovoltaic electromagnetic transient model is constructed on the MATLAB/Simulink simulation platform, and the effectiveness of the proposed identification method is validated through a comparative analysis with measured data.