Synchronization strategy for single phase inverters for feeding renewable energy in South African National Grid

Phase locked loop inverter synchronization method is the mostly used synchronization method for both single phase and three phase systems. Recent research has focused on the improvement of the performance of the phase lock loop inverter synchronization method under different grid conditions. The common phase locked loop synchronization techniques such as the Second Order Generalized Integrator based PLL (SOGI-OSG), Enhanced PLL (EPLL) all have certain disadvantages compared to each other and other synchronization techniques. Factors such as noise, low voltage ride and harmonics are part of the faults that inverters need to be able to control. A lot has been done recently to improve the performance of the phase lock loop such as using adaptive filters and other synchronization techniques together with phase lock loop synchronization.