PROJECT TITLE :
Hybrid Energy Storage System Micro Grids Integration For Power Quality Improvement Using Four Leg Three Level NPC Inverter and Second Order Sliding Mode Control - 2017
Rising demand for distributed generation based mostly on renewable energy sources (RES) has led to several issues within the operation of utility grids. The microgrid may be a promising answer to unravel these issues. A dedicated energy storage system may contribute to a higher integration of RES into the microgrid by smoothing the renewable resource's intermittency, improving the quality of the injected power and enabling further services like voltage and frequency regulation. However, due to energy/power technological limitations, it's often necessary to use hybrid energy storage systems (HESS). During this paper, a second-order sliding mode controller is proposed for the ability flow control of a HESS, employing a four-leg 3-level neutral-purpose-clamped (four-Leg 3L-NPC) inverter as the only interface between the RES/HESS and therefore the microgrid. A three-D space vector modulation and a sequence-decomposition-based mostly ac-facet management enable the inverter to work in unbalanced load conditions while maintaining a balanced ac voltage at the purpose of common coupling. DC current harmonics caused by unbalanced load and the NPC floating middle point voltage, together with the power division limits, are fastidiously addressed during this paper. The effectiveness of the proposed technique for the HESS power flow control is compared to a classical PI management theme and is proven through simulations and experimentally using a four-Leg 3L-NPC prototype on a check bench.
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