Enhanced Fault Ride-Through of Power Converters Using Hybrid Grid Synchronization

Inaccurate phase-angle jump (PAJ) estimation of the grid voltage during faults is one major causes for poor fault ride-through (FRT) performance converters. To overcome this issue and make converter’s current controller robust, article proposes a hybrid synchronization transition technique. In concept, synchronous reference frame-based phase-locked loop (SRFPLL) method used normal operation switched to an arctangent-based faults. Simultaneously frequency arctangent derived frequency. A common method, which depends on error between two-phase techniques, proposed ensure smooth frequencies. The technique implemented using control three-phase source converter in SRF. both symmetrical asymmetrical along with FRT strategies tested real-time experiments. It observed that transition-based reduces loss synchronism duration. Additionally, it offers more robust compared SRFPLL over wide range sags PAJs.