Performance Evaluation of Modulation Techniques in Single-Phase Dual Active Bridge Converters

Abstract

This research presents a thorough comparison of different modulation techniques employed in dual active bridge (DAB) converters. The performance of a DAB converter is essentially affected by the modulation technique and the operating point, including power level, input, and output voltages. A deep understanding of different modulations is required to achieve the highest performance in the entire operating range. Therefore, this paper focuses on comparing different modulation techniques over a DAB converter's operating span. The comparison results provide guidance to apply the correct modulation in certain working areas keeping the converter on top of its performance. Moreover, the paper proposes an optimization solution with distinct objective functions adoptable in DAB converters to reduce power loss. The proposed optimization approach outperforms the existing solutions regarding generality and simplicity. The optimization associates with the modulation techniques that include more than one degree of freedom, such as extended phase shift (EPS) and dual-phase shift (DPS). The proposed optimization and the investigated modulation techniques are evaluated in terms of the converter's efficiency, current stress, and backflow power. The evaluation is realized by the simulation study of a 10kW 800V/500V SiC-based DAB converter in PLECS software.INDEX TERMS Dual active bridge (DAB) converter, efficiency, modulation techniques, backflow power, current stress.

Improvement of Efficiency in Bidirectional DC-DC Converter with Dual Active Bridge Using GaN-HEMT

“…When the prototype is operated as a DAB, ZVS is possible with SPS near the rated power (11)(12)(13) . Although the same operation with TPS is performed here to reduce turn-off losses, a diode rectification operation is also performed in a portion of the rectifier circuit.…”

“…In recent years, many research results have been reported on bidirectional isolated DC-DC converters used in battery chargers of electric vehicles and energy storage devices. Typical circuit schemes for bidirectional converters are composed of an LLC resonant converter (2)(3)(4) (hereafter LLC) and a dual active bridge (2)(3) (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18) (DAB).…”

“…The employment of a dual-phase-shift (DPS) or a triple-phaseshift (TPS) enables ZVS for DAB under a broad range of conditions and improves the efficiency at light loads (5) (11)(12)(13) . Furthermore, a method of using frequency control (14) or switching circuit constants (15) has also been proposed.…”

Power Electronics Converters for the Internet of Energy: A Review

“…The Single-Phase Shift (SPS) modulation technique is used to control the conversion system [74]. Using this technique, the rectangular voltages V CD , V EF , and V GH are shifted, lagging with respect to the voltage V AB , by the phase shifts ϑ 12 , ϑ 13 , and ϑ 14 , respectively.…”

An Adaptive Sliding Mode Control for a Dual Active Bridge Converter With Extended Phase Shift Modulation

“…Various modulation techniques are employed for the DAB converters in literature, which are single phase shift (SPS) [4], extended phase shift (EPS) [5]- [7], double phase shift (DPS) [8]- [10], and triple phase shift (TPS) [11] modulations. SPS is the conventional modulation scheme which is the simplest one controlling the converter with only one degree of freedom while suffering from inferior performance at low power regions, limited zero voltage switching (ZVS) zone, high current stress (CS) and high back flow power (BFP) [12]. Compared to the SPS modulation, the EPS modulation provides a wider ZVS zone, less BFP, and lower CS, especially in medium power level.…”