Dynamic Equivalent Modeling Method for Distribution Grids Containing A High Percentage of Distributed PV

The high proportion of distributed power sources connected to distribution networks exacerbates the uncertainty and complexity of these networks, making dynamic equivalency studies of the whole system significantly important. This paper aims to perform dynamic equivalent modeling on distribution grids containing a high proportion of distributed photovoltaic (PV) and proposes a methodology for equivalencing such networks. The methodology is based on ARMAX models that use only boundary variables measured at the distribution network point of common coupling. Therefore, no previous knowledge about the system is required. The effectiveness of the proposed method is evaluated through joint simulation with DIgSILENT-MATLAB. The experimental results show that the proposed method achieves dynamic equivalency for high-proportion distributed PV systems and significantly simplifies the description of dynamic processes in the simulation.