DC-Offset Compensation for Three-Phase Grid-Tied SPV-DSTATCOM Under Partial Shading Condition With Improved PR Controller

This work deals with a single-stage three-phase grid connected solar photovoltaic-distribution static compensator (SPV-DSTATCOM) under partial shading condition (PSC). During PSC, the SPV-DSTATCOM is connected with the distribution network to solve issues like active current sharing, reactive power control, and harmonic elimination. The conventional Proportional Resonant (PR) controller behaves as a notch filter at resonance frequency with high gain in magnitude, and it has very little dc-offset rejection capability. Here, an improved PR based on second-order generalized integrator (IPR-SOGI) control architecture with unity gain at the fundamental frequency and more dc-offset rejection capability has been presented to address the drawback of the PR controller. The performance of the proposed controller is examined under different loading conditions in steady-state and dynamic conditions. Finally, a comparison between the proposed controller with the PR controller and adaptive PR controller (APR). The experimental validation of the proposed prototype has been carried out in the laboratory.