This abstract outline a proportional-integral (PI) controller and direct-quadrature (DQ) frame-based optimal control method for a three-phase grid-connected inverter using a MATLAB simulation. This is an open access article under the CC BY-SA license. In terms of grid synchronization, voltage regulation, and harmonic abatement, the proposed control technique attempts. . Traditional control methods, such as proportional-integral (PI) control for DC-link voltage regulation, often struggle under abnormal operating conditions, resulting in voltage fluctuations and instability in the maximum power point tracker (MPPT). The gains are calculated based on the values of the couplin drives, STATCOMs, active power filters, uninterruptible power supplies and photovolt ic systems [1,2]. The grid can become imbalanced for a variety of. .
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