This article develops a publication-ready integrative research study on dynamic voltage restorers (DVRs) controlled through proportional-integral (PI) strategies in modern smart power environments. The study is grounded strictly in the provided references and addresses an increasingly important problem in electrical engineering: how to maintain voltage quality, mitigate sag events, strengthen distribution reliability, and position DVR-based architectures within broader smart-grid, renewable-energy, storage, and cyber-physical operating contexts. The reviewed literature consistently demonstrates that PI-controlled DVR systems remain central to practical voltage restoration because they balance implementation simplicity, interpretability, controllability, and acceptable dynamic response under industrial and distribution-level disturbances (Chen & Li, 2023; Singh & Sharma, 2022; Wang & Zhang, 2023). At the same time, recent studies point toward a more complex operating environment in which DVRs are no longer isolated compensating devices, but parts of multi-layered infrastructures that include grid-linked solar systems, battery charging subsystems, bidirectional converters, electric vehicle interfaces, cloud-assisted monitoring, and increasingly intelligent digital control ecosystems (Ganesh Kumari et al., 2022; Katyal et al., 2024; Ayyappa et al., 2025; Thangam et al., 2021).

Using a qualitative integrative methodology, this article synthesizes conceptual, control-oriented, and application-focused insights from the supplied sources. The results show four major findings. First, PI-controlled DVRs remain one of the most operationally viable approaches for sag mitigation and voltage regulation across industrial and smart-grid settings (Hussain & Qamar, 2023; Patel & Kumar, 2023; Rao & Kumar, 2024). Second, optimization of controller tuning materially improves compensation quality, response speed, and stability margins (Khan & Li, 2023; Kumar & Gupta, 2024; Sharma & Kumar, 2023). Third, converter topology and storage coordination strongly influence the practical success of DVR deployments in renewable and distributed energy contexts (Swetha et al., 2021; Katyal et al., 2024). Fourth, as power systems become digitized, cybersecurity, cloud resilience, and explainable intelligent supervision become essential complementary dimensions rather than external concerns (Haritha et al., 2024; Vellela & Balamanigandan, 2024; Mandava, Vellela, Gorintla, et al., 2025). The article concludes by proposing a comprehensive interpretive framework for next-generation DVR deployment and identifies research directions linking power quality engineering with trustworthy cyber-physical intelligence.