Generally uninterruptible power supply (UPS) is used to maintain a stable electric power supply to critical loads with high quality power protecting them against unexpected power failure. For example, medical facilities and data-storage computer systems require fast response, compensation and immediate availability of electrical power. Considerably affect these characteristics is energy storage...

Distributed generation is an emerging concept in the electricity sector, which represents good alternatives for electricity supply instead of the traditional centralized power generation concept. Among different distributed generation schemes, fuel cell is expected play a big part due to its inherent advantages. The power density of the quasi-Z-source-based single-phase isolated DC/DC converter...

The bipolar DC microgrid topology is characterized by three voltage levels and able to transfer power more efficiently than a conventional microgrid. This paper proposes an advanced control strategy aiming ensure the balancing between upper lower terminals of regardless distribution loads. proposed controller based on backstepping method, which well known for its robustness global asymptotic st...

The paper analyzes different concepts for active charge balancing for a multi-cell battery energy storage system used as a backbone for a DC micro grid. The storage system is based on a cascaded multi-level converter topology where each (lead-acid) battery is equipped with dedicated low-voltage buck type DC/DC converter stage placed directly at the battery terminals. To minimize the output ripp...

In this paper, particle swarm optimization (PSO) optimized PI controlled five level UPFC is proposed for a double circuit transmission line. To enhance performance, different approach considered here. It uses simplified power system models to derive the decoupled controllers, but detailed modeling of converters improves their ride-through capability. This paper introduces linear controllers obt...

DC microgrids initiated the change of a paradigm regarding concept about electrical distribution networks, especially in context distributed generation associated with renewable energies. However, this new reality opens area research, which several aspects must be carefully studied. Indeed, bipolar design is one principal dc microgrid configurations considering its characteristic wiring. Althou...

A six-level inverter system for an open-end winding induction motor drive is presented in this paper. Multilevel inversion is achieved by feeding an open-end winding induction motor with a 3-level inverter from one end and a 2-level inverter from the other end of the motor. The 3level inverter used in the proposed drive, is realized by cascading two 2-level inverters. The combined inverter syst...