Aggregation Equivalence Method for New Energy Stations Based on PSASP Modelling Loss Consistency

Once a significant number of new energy sources have been connected, the operational characteristics of the system undergo a substantial transformation. The establishment of an equivalent model for the integration of new energy sources represents a crucial step in the assessment of the safety and stability of the power grid. The use of a detailed model for the purposes of carrying out a simulation analysis is both time-consuming and computationally intensive. It is therefore necessary to implement a reasonable equivalent simplification. This paper puts forth a novel approach to modelling the aggregation of energy stations, one that is based on the principle of loss consistency within the PSASP framework. The initial step is to construct a comprehensive model of the new energy station within the PSASP program. Subsequently, the unit response characteristics are processed in groups according to the differences in characteristics, and the equivalent impedance of the transformer and collector circuit of each group is calculated based on the principle of loss consistency. The results of the calculation example demonstrate that the aggregated equivalent model exhibits a minimal discrepancy in the dynamic response of active and reactive power under diverse fault ride-through operational scenarios. The proposed method of modelling the aggregated equivalent of new energy stations demonstrates excellent adaptability and high accuracy in the analysis of grid operation modes.