Enhanced Control of Three-Phase Grid-Connected Renewables with Fault Ride-Through Capability under Voltage Sags

The uninterruptible operation of grid-connected renewables under the occurrence grid voltage sags is addressed in this work. This achieved due to incorporation an enhanced control algorithm a renewable source. low-voltage ride-through was developed accordance profile introduced by IEC 61400-21 regarding sags. To guarantee continuous agent during sags, not only instantaneous reactive power but also active moderate injected utility fulfilling code requirements. A dual second-order generalized integrator frequency-locked loop synchronization used estimate system’s frequency, together with positive and negative sequences three-phase voltages when unbalanced occurred. current made stationary reference frame using proportional-resonant regulators, DC source emulate primary energy from any type system. validation proposed conducted for system apparent 500 kVA. results several experimental tests demonstrated proper behavior algorithm.