Electromagnetic transient (EMT) simulation algorithm for evaluation of photovoltaic (PV) generation systems

Use of inverter-based resources facilitating renewable energy resources such as photovoltaic (PV) generation is increasing rapidly with decreasing costs and reduced emissions associated. To accommodate such rapid growth of inverter-based resources like PV systems, electromagnetic transient (E M T) simulation models of both PV systems and grids are required to analyze the interaction of PVs in the grid (like the post-event analysis). In addition, the E M T simulation would help with the planning of future power grid with a large number of PVs as well as other inverter-based distributed generation systems. In this paper, the E M T simulation models of PV systems and grids are developed based on the differential algebraic equations (DAEs) representing their E M T dynamics. Furthermore, advanced simulation algorithms including numerical stiffness-based hybrid discretization, D A E clustering and aggregation, multi-order integration, and matrix splitting approaches are applied to accelerate the E M T simulation. The proposed algorithm was applied to 125 PV inverters within 52-bus medium-voltage (MV) distribution grid.