Alternate computation of the unit vectors synthesis towards synchronization of current-controlled grid-tie converter for renewable power system: An embedded outlook

Phase synchronization and frequency tracking are essential part of control unit design for the grid -tie power converter of the efficient energy conversion system. A robust but straightforward algorithm has been proposed here using a digital zero-crossing detector (ZCD) circuit. The ZCD is made to be vigorous by a D-latched based implementation against the multiple zero-crossings in the synchronizing signal at the point of the common coupling (PCC). The corresponding unit vectors comprising of the sine and cosine components is synthesized using trigonometric orthogonal properties (TOP) and implemented using field programable gate array (FPGA) by backward Eular's method. The proposed approach is simulated using Altera Quartus II IDE on a target device CycloneEP1C12Q240C8. The performance of the unit vectors has been tested on current-controlled pulse width modulated (PWM) power converter for seamless energy conversion. The paper includes the contextual review, description of the scheme, analysis, implementation and experimental validation. The analytical findings and experimental results are well agreeing (c) 2021 Karabuk University. Publishing services by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).