Abstract
An isolated type bidirectional resonant converter is presented in this paper. Using a dual active bridge as the main topology and integrating symmetric resonant mechanism, the developed converter features an isolated type bidirectional resonant converter with bidirectional power conversion and electrical isolation capabilities to ensure working security and stability. The application of a symmetric resonant scheme enables the control range of input and output voltages to be widened and achieves soft switching during bidirectional power conversion. A converter design process covering all the bases is exhibited in this work. With the digital signal processor (DSP) TMS320F28335 being employed as the control core, the developed isolated bidirectional resonant converter can effectively handle the power conversion between the simulated 400 V DC grid and the energy storage battery ranging from 280 to 403 V. Based on a 1 kW capacity design, the test data reveal that the forward conversion efficiency from grid to battery can reach 93.25%, and the reverse conversion efficiency from battery to grid is as high as 94.60%.
Highlights
Most of the conventional renewable energy storage system is made up of multiple converters [1]with at least one for storage and another for supply
Refs. [4,5,6] are articles regarding dual active bridge (DAB) design; these circuits are featured with simple structure, easy control, and bidirectional power flow
There exist some problems in a single-phase shift controller, such as a narrower voltage range at light load and curtailed efficiency owing to hard switching
Summary
Most of the conventional renewable energy storage system is made up of multiple converters [1]with at least one for storage and another for supply. Most of the conventional renewable energy storage system is made up of multiple converters [1]. The essential power conversion circuits lead to cost and size increase. The introduction of a bidirectional converter [2,3] with bidirectional power propagation ability can effectively overcome these problems and enhance the conversion efficiency. [4,5,6] are articles regarding dual active bridge (DAB) design; these circuits are featured with simple structure, easy control, and bidirectional power flow. There exist some problems in a single-phase shift controller, such as a narrower voltage range at light load and curtailed efficiency owing to hard switching. In the case of renewable energy regulation applications, hard switching might usually yield the current waveform to be square or sawtooth, invoking high-frequency electromagnetic interference (EMI) and excessive switching loss
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