Short-circuit analysis of grid-connected PV power plants considering inverter limits and grid-support

This paper presents a different approach for shortcircuit analysis of grid-connected photovoltaic (PV) power plants, where several Voltage Source Converters (VSCs) are adopted to integrate PV modules into the grid. The VSC gridsupport control and various potential current-saturation states are considered in the short-circuit calculation. In particular, the studied system is modeled using a flexible formulation that includes the converter equations in both normal operation and fault conditions. Then, two different methodologies are proposed for short-circuit calculation with different options regarding the existence of multiple equilibrium points involving different converters current-saturation states. Case studies have been presented for the system with different numbers of PV inverters.