Abstract
An energy storage system (ESS) plays an important part in a renewable energy generation system for stable and efficient power harvesting. To realize the function of an ESS, a bidirectional DC/DC converter with high power density and high efficiency is highly desired. In this paper, a high-frequency (HF) isolated dual-bridge series resonant converter (DBSRC) with a piecewise control strategy is proposed for an application with a wide variation of voltage gain. The proposed control strategy is based on dual-phase-shift modulation for a balance between complexity and flexibility. With this proposed control strategy, zero-voltage switching is kept for all switches on the low-voltage side and half of switches on the high-voltage side. Besides, there is no circulation energy on the low-voltage high-current side for full load operation. A step-by-step design procedure is also included to calculate the converter components and control parameters. Verification of the analysis and design are performed successfully through simulation and n experimental test. Comparisons with some existing control methods are also made experimentally, which highlights that the proposed control strategy is able to achieve comparable performance as the reported optimal current control with simpler calculation and implementation.
Highlights
To deal with the greenhouse effect due to fossil fuel use and the potential energy crisis in the future, renewable energy generation techniques have drawn much attention from industrial/academic researchers, but policy-makers from governments around the world [1–8].a DC-linked hybrid renewable energy generation system is shown [9–11]
The actual varying paths of the two phase shifts based on the single-phase-shift control (SPS), PW-dual-phase-shift angles (DPS), and minimum current trajectory (MCT) control strategy are all marked for bidirectional power with maximum gain (Figure 8a) and minimum gain (Figure 8b), respectively
To improve the performance of a dual-bridge series resonant converter, a piecewise control strategy based on dual-phase-shift modulation is proposed in this work
Summary
To deal with the greenhouse effect due to fossil fuel use and the potential energy crisis in the future, renewable energy generation techniques have drawn much attention from industrial/academic researchers, but policy-makers from governments around the world [1–8]. If single-phase-shift control (SPS) is applied, both DAB and DBSRC suffer from a limited zero-voltage switching (ZVS) range with the variation of non-unity converter gain and high circulation current. The main features of the proposed PW-DPS control can be concluded as: no circulation energy on the low-voltage side at full load for any voltage gain, ZVS operation of six switches, and high efficiency at partial load. The proposed PW-DPS strategy shows quite similar competitive performance compared with the MCT control, which tends to achieve an overall minimized rms current operation through complicated optimization calculation of three phase-shifts
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