Online clustering modeling of photovoltaic power plant with LVRT control function

This paper proposes an online clustering modeling method for photovoltaic (PV) power plant considering low voltage ride-through (LVRT) control. The proposed method takes the distance of the unit impulse response curves of the inverter controllers as the clustering index to build the clustering models of the inverter controllers. After all LVRT controllers are simplified and described by an equivalent LVRT model, the clustering equivalent model of the PV power plant can be established which is composed of the clustering models of inverter controllers combined with their own equivalent LVRT models. The simulation results show that the proposed method has a strong capability to track the dynamic characteristics of the PV power plant while the output distribution of PV units changes.