“Hybrid Energy Storage System Micro gridsIntegration for Power Quality Improvement UsingFour-Leg Three-Level NPC Inverter and Second-Order Sliding Mode Control” (2018) International Journal of Advance Engineering and Research Development (IJAERD), 5(4), pp. 985–988. Available at: https://www.ijaerd.org/index.php/IJAERD/article/view/5590 (Accessed: 9 September 2025).