No abstract

No abstract

No abstract

No abstract

This paper proposes a new topology for dual active bridge (DAB) for integrating battery energy storage to the utility grid. The transformer plays an essential role in achieving the isolation between the two full bride converters in traditional DAB. In order to integrate the battery energy storage to the existing grid system, the transformer turns ratio should be very high for the traditional DAB. In this paper a bi-directional DC/DC converter with full bridge on low voltage side and a single phase three level neutral point connected (NPC) structure on high voltage side of the dual active bridge is developed. This topology will reduce the turns ratio of the isolation transformer as well as voltage stress on the switches. Along with this zero voltage switching is achieved for all the switches in full bridge and NPC for bi-directional power flow. The NPC based grid side inverter is employed in this paper with current hysteresis control. The overall configuration is suitable for utility application with improved reliability and reduced maintenance.

This study presents a new single-phase multilevel inverter topology along with whale optimisation algorithm-based switching technique. The proposed multilevel inverter requires a significantly reduced number of power semiconductor devices as compared with some of the prominent multilevel inverters. The proposed work is able to outperform the existing techniques involving popular optimisation techniques in terms of inverter performance, the rate of convergence and computational overhead. Detailed simulation analysis has been carried out for the proposed multilevel inverter on MATLAB/Simulink environment. An 11-level proposed inverter prototype has been developed and experimental results have been provided to verify the performance of the proposed multilevel inverter.

No abstract

Summary In this paper, a single‐switch hybrid high voltage gain boost converter topology employing zero‐voltage switching (ZVS) feature is proposed. The proposed converter can achieve high voltage gain with soft switching operation over a wide range of load. The topology is a combination of the Cockcroft‐Walton diode‐capacitor voltage multiplier and a conventional boost converter, which results in a hybrid DC‐DC converter. The diode‐capacitor ladder enables the converter to achieve high voltage gain without a transformer or coupled inductor. Because of its transformerless design, single switch with lower duty cycle requirement, and ZVS feature, the efficiency of the converter is improved significantly. Moreover, due to the input inductor, it is able to provide lower input current ripple and variable fractional voltage gain, which is a key requirement for maximum power point tracking (MPPT) in photovoltaic application. A 480‐W hardware prototype with 48‐V input voltage and 450‐V output voltage is developed, and experimental results are presented to validate the efficacy of the proposed converter. The total achievable efficiency is above 95.4%, in the full load range (80‐480 W).