Comparative Study of Symmetrical Controlled Grid-Connected Inverters

The asymmetrical dynamics of the conventional synchronous reference frame phase-locked loop (PLL) enhance complexity system and endanger stability grid-connected voltage source converters. In this article, admittance modeling three different symmetrical control strategies, i.e., oriented with PLL, modulated direct power control, proportional–resonant is proposed uniformed based on same tracking property. feedforward decoupling controllers are both considered. Moreover, due to structure their models can directly be modeled under $\alpha \beta$ as single-input single-output systems. addition, reveal similarity between methods emphasize differences, constructed by using framework. verified frequency-scan, performance tested MATLAB/Simulink Simscape Power System experimental prototype. Finally, criterion simulation results carried out in real-time platform RTLAB from Opal-RT.