Robust Fault Ride Through of Grid-Connected Inverter using Hybrid Simulation Framework

Fault ride through (FRT) is an essential ancillary service that needs to be provided by the grid-connected solar Inverters. This paper presents robust FRT for the single-phase inverter by proposing an adaptive grid synchronization technique. This technique is a combination of closed-loop and open-loop grid synchronization. The transition between the two synchronization techniques depends on the grid operating conditions. With the proposed hybrid grid synchronization, the FRT of the single-phase inverter is implemented. A co-simulation platform is chosen to implement the proposed concept. The inverter synchronization and FRT are simulated using MATLAB/SIMULINK to capture the behavior of electromagnetic transient (EMT). On the other hand, the inverter is integrated into the IEEE 13 bus benchmark model, which is modeled using OpenDSS to capture the phasor simulation (PS). A proper co-simulation framework is followed to reduce the computational time as well as validate the proposed robust FRT of the inverter during grid faults.