Series inductance design of dual‐active‐bridge converter: ZVS range with practical considerations

This article presents an isolated bidirectional DC‐DC dual active bridge (DAB) converter with an integral sliding mode‐based direct power control (SM‐DPC). Maintaining the dc‐link stability and obtaining a robust control for the converter during sudden load change is a significant challenge. The sliding mode control is well known for its robustness, stability, and tracking performance. The sliding surface based on output voltage error is selected, while the proposed method utilizes the equivalent control approach to generate the power reference for the DAB converter. The direct power control provides an easy control method for the DAB converter as the output voltage depends on the transmitted power, governed by the phase shift angle of two H‐bridges of the converter. The proposed method enhances the steady‐state performance and renders a fast transient response under load change and input voltage variation. Moreover, the method avoids complicated converter modeling and utilizes the voltage dynamic equation and power transfer equation for the controller design. The controller performance and effectiveness are validated with experimental results for a 2‐kW DAB converter.

Section: Dab Converter Systemmentioning

confidence: 99%

Integral sliding mode based direct power control of isolated DC‐DC converter for improved voltage regulation

Tiwary

Panda

et al. 2022

“…Based on the research of previous works, a three control degrees modulation TPS 8 is proposed. Since there are three control degrees in TPS, more optimization targets are introduced such as zero voltage switching (ZVS) for all switches, 9–11 eliminating the non‐active power 12–14 and DC bias 15,16 . That is the reason why the TPS modulation is a more general modulation for DAB converter 17 …”

Section: Introductionmentioning

confidence: 99%

Efficiency improvement of dual active bridge converter using simple graphical optimization method

Chen,

Zheng,

Tang

et al. 2023

SummaryAiming to the problems of high circulating current and low efficiency caused by the traditional strategy of dual active bridge (DAB) converter under light load, in this paper, simple graphical optimization method (GSO) is proposed to improve the efficiency of dual active bridge converter. Through the contour plot of transmission power and current stress, optimal efficiency point can be obtained by tangent of contour map under condition of constant power, and heavily calculation or complex iterations of existing conventional control strategies are avoided. Moreover, analysis of proposed graphical current stress optimization is addressed, and controller design of proposed method is given and described. Efficiency comparison between traditional modulation strategy and GSO is given to show the advantage of proposed mothed. An experimental prototype is built to verify the analysis.

“…There are also other modulation schemes such as hybrid modulation, 10 dual-phase shift modulation, 11 unified TPS, 12 and so on. Some of the advanced modulation schemes for the current stress optimization strategies are discussed in Huang et al 12 and Hou et al, 13 reduction in zero circulating currents are dealt in Karthikeyan and Gupta 14 and Chilakalapudi and Kumar, 15 improvement in the soft switching region are described in Riedel et al 16 and Kirsten et al, 17 and improvement in the dynamic response of the converter are explained in Takagi and Fujita 18 and Guacaneme et al 19 Similarly, the most common circuit modification is resonant converters. [20][21][22] In Karthikeyan and Gupta, 23 a front end and rear end switch are introduced in DAB, eliminating the input and output sides' circulating current.…”

mentioning

confidence: 99%

A quintuple phase shift modulation scheme in multilevel dual active bridge converter for battery energy storage system

Bheemraj

Karthikeyan

Kumaravel

2022

Generally, the dual active bridge (DAB) bidirectional DC-DC converter suffers from harmonics in the high-frequency link (HFL) conversion stage while operating under any modulation scheme. This paper proposes a quintuple phase shift (QPS) modulation scheme to suppress the harmonics under the whole operating range. A bidirectional auxiliary switch in the low voltage bridge produces a five-level output, which alleviates harmonic components of HFL current. The total harmonic distortion (THD) analysis is done for various operating conditions and is compared with the conventional modulation scheme, such as single phase shift and dual phase shift. The THD can be reduced in the entire power transmission for the proposed modulation scheme by defining the suitable phase shift ratios. Also, the power flow analysis under QPS modulation is reported in this paper. To validate the proposed approach's theoretical performance, simulation results are obtained under different operating conditions and verified with experimental results. The QPS modulation is implemented using the Spartan 3AN FPGA processor.