Bidirectional Dual Active Bridge DC-DC Research Articles

High frequency isolated bidirectional dual active bridge DC-DC converters and its application to distributed energy systems: an overview

Among the DC-DC converters, an isolated bidirectional dual active bridge converter is a core circuit for high-frequency power converters in distributed energy system applications. These high-frequency power conversion systems attract academia and industry due to various advantages, such as high-power density, less weight, reduced noise, high efficiency, low cost and high reliability. First, the importance of power electronic converters in modern-day life is introduced. Second, a topological overview of voltage-fed and current-fed isolated bidirectional dual active bridge converters is presented with their importance in integrating hybrid power sources. Third, switching modes of isolated bidirectional DC-DC converters are also presented with a degree of freedom of control. Forth, performance evaluation of voltage-fed and current-fed isolated bidirectional converters has been presented with an example. Their suitability in integrating fuel cells and photovoltaics with energy storage systems in low to medium-power applications is presented.

Power Electronics Converters for the Internet of Energy: A Review

This paper presents a comprehensive review of multi-port power electronics converters used for application in AC, DC, or hybrid distribution systems in an Internet of Energy scenario. In particular, multi-port solid-state transformer (SST) topologies have been addressed and classified according to their isolation capabilities and their conversion stages configurations. Non-conventional configurations have been considered. A comparison of the most relevant features and design specifications between popular topologies has been provided through a comprehensive and effective table. Potential benefits of SSTs in distribution applications have been highlighted even with reference to a network active nodes usage. This review also highlights standards and technical regulations in force for connecting SSTs to the electrical distribution system. Finally, two case studies of multi-port topologies have been presented and discussed. The first one is an isolated multi-port bidirectional dual active bridge DC-DC converter useful in fast-charging applications. The second case of study deals with a three-port AC-AC multi-level power converter in H-Bridge configuration able to replicate a network active node and capable of routing and controlling energy under different operating conditions.

Application of Thermal Balance Phase-Shift Control Strategy to Dual-Active-Bridge DC-DC Converter

With the development of the more/All electrical aircraft technology, the dual active bridge converter has been applied to the energy storage device to realize the bidirectional power flow in aircraft electrical system. The power loss of power device in DAB converter affects the operational life of the device and the reliability of the converter. So it is an important performance index to keep the temperature balance for power device in DAB converter. In this paper, the operational mode of dual active bridge bidirectional DC-DC converter in extended-phase-shift (EPS) control is analyzed and verified by experiment, find the reasons for difficult to achieve soft-switching under light load conditions, then proposes a novel thermal balance phase-shift control strategy on the basis of EPS. Experimental methods in this paper are alternation control mode and temperature feedback control mode. The thermal image and temperature was analyzed. The efficiency curve was plotted. The switching waveform was observed. the thermal balance was achieved to verify the effectiveness. and finally achieves the goal for improving the converter efficiency, reduces the devices heat stress, improves the reliability of the DAB converters and increases device lifetime.

A Novel Multiport Bidirectional Dual Active Bridge Dc-dc Converter for Renewable Power Generation Systems

Background/Objectives: Multi Port Converters (MPCs) have gained importance in renewable power generation recently. MPCs can interface and control many power terminals and are generally economical with high power density, efficiency, and compact structure. Bidirectional MPC is proposed in this paper to facilitate power flow between load and source in a two way channel. Methods/Statistical Analysis: The proposed model is simulated using MATLAB software. The results confirm that the overall efficiency of the system is increased and the power flow is bidirectional with reduced losses. Findings: In the present existing topology, Bidirectional flow of energy is a challenging study in case of MPCs. Power losses will be high due to the use of Diode Bridge. The main motive of this paper lies in proposing a systematic method for deriving MPC topologies from non-isolated BDCs and FBCs. The derived MPCs use four port converters with both buck and boost topologies. Due to the usage of full bridge converter, bidirectional power flow is achieved unlike the traditional method. Application/Improvements: The proposed system is capable of being used for the applications of renewable power system, namely, PV-supplied aerospace power systems, fuel cell, battery systems, hybrid energy storage systems, and thermoelectric systems with energy backup. It has reduced power loss and facilitates two way power flow.

Generalized Modeling and Optimization of a Bidirectional Dual Active Bridge DC-DC Converter Including Frequency Variation

The paper presents a novel modeling approach of the power flow in a bidirectional dual active bridge DC-DC converter. By using basic superposition principles, the mathematical distinction of cases is avoided in the modeling process of high-frequency transformer currents for different types of modulation. The generalized model is used in an optimization of converter losses of a 3.3 kW electric vehicle battery charger with an input voltage of 400 V and a battery voltage range of 280 V to 420 V. Besides the commonly used control variables such as phase-shift and clamping intervals, also the variation of switching frequency is considered in the optimization process. The optimal modulation including frequency variation leads to an increase of converter efficiency up to 8.6% using IGBTs and 17.8% using MOSFETs in the most critical point compared to phase-shift modulation at fixed switching frequency.

Static Characteristic Analysis of Proposed Bi-Directional Dual Active Bridge DC-DC Converter

Static Characteristic Analysis of Proposed Bi-Directional Dual Active Bridge DC-DC Converter

Comparative analysis of single-and Three-Phase Dual Active Bridge Bidirectional DC-DC Converters

Many modern power conversion systems require a bidirectional energy transfer capability as a central part of their system operation. Preferably, such systems should use a single high efficiency power electronic conversion system to reduce size, weight and cost. For higher power bidirectional conversion, the common topology proposed is a dual active bridge structure, where two DC-AC converters are coupled back-to-back through an AC inductor/transformer. Either single-phase or three-phase converters have been proposed for such a system, but to date no clear-cut basis for selecting between these two alternatives has been established. This paper presents a comparative evaluation of single-and three-phase back-to-back converters for use in a bidirectional power transfer applications. The paper considers these two alternatives from the perspective of operating performance and losses, and provides a basis for selecting between the two topologies in any particular operating context.