DC-Offset Compensation for Three-Phase Grid-Tied SPV-DSTATCOM Under Partial Shading Condition With Improved PR Controller
Arobinda Dash, Durgesh Prasad Bagarty, Prakash Kumar Hota, Ranjan Kumar Behera, Utkal Ranjan Muduli, Khalifa Al Hosani
Abstract
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.