Dynamic Aggregate Equivalent Modeling of Solar Parks Considering Irradiation Levels and Fault Scenarios

With the high integration of solar photovoltaic parks (SPPs) in the power system, there is a growing necessity for detailed modeling of SPPs to perform dynamic security assessment. The detailed modeling of these SPPs is complex and demands significantly high computational resources. Therefore, there is a need for an equivalent SPP model having the same dynamics as that of the detailed SPP model with lesser computational requirements. This paper presents a dynamic aggregate equivalent model of SPP to conduct dynamic security assessment. The dynamics of SPP in fault scenarios are not solely dependent on its control strategy but also on factors such as irradiation levels and the severity of faults. Thus, a clustering methodology is proposed based on irradiation levels and the severity of fault cases. Subsequently, a dynamic aggregate equivalent SPP model is introduced for each clustered solar photovoltaic unit (SPU). Then, a dynamic ramp recovery rate is proposed for the clusters having active power ramp recovery. Furthermore, extensive simulation studies have been performed in the MATLAB/Simulink platform to evaluate the accuracy and performance of the dynamic aggregate equivalent model of SPP. Additionally, simulations have been conducted on the OPAL-RT platform to assess the real-time feasibility of the proposed SPP modeling approach.