Abstract
Symmetric or asymmetric grid fault can cause faulty phase sudden voltage dip and the unexpected trip of local generation units. Also, fault-ride-through requirements bring challenges to inverter’s operation, such as active power oscillation due to unbalanced voltage and over-current injection in low-voltage phase. To address above issues, an autonomous optimal voltage support scheme which aims to support point of common coupling (PCC) voltage amplitudes by two-stage photovoltaic (PV) system during fault is proposed. The scheme can determine optimal positive and negative sequence reference current considering fault characteristics, grid impedance condition, maximum available PV generation as well as inverter’s physical and operational constraints, by calculating the analytical solution of a two-variable nonlinear programming problem. And simulation results demonstrate the usefulness of proposed voltage support strategy for avoiding six-PV solar farm unexpected trip during short-time symmetric and asymmetric faults.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call