Unified Triple-Phase-Shift Control to Minimize Current Stress and Achieve Full Soft-Switching of Isolated Bidirectional DC–DC Converter

2016 ◽  
Vol 63 (7) ◽  
pp. 4169-4179 ◽  
Author(s):  
Jun Huang ◽  
Yue Wang ◽  
Zhuoqiang Li ◽  
Wanjun Lei
Keyword(s):  
Phase Shift ◽  
Soft Switching ◽  
Current Stress ◽  
Shift Control

scholarly journals Multi-Objective Unified Optimal Control Strategy for DAB Converters with Triple-Phase-Shift Control

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6444
Author(s):  
Jinhui Zeng ◽  
Yao Rao ◽  
Zheng Lan ◽  
Dong He ◽  
Fan Xiao ◽  
...  
Keyword(s):  
Optimal Control ◽  
Phase Shift ◽  
Dynamic Response ◽  
Control Strategy ◽  
High Efficiency ◽  
Soft Switching ◽  
Optimal Control Strategy ◽  
Current Stress ◽  
Multi Objective ◽  
Shift Control

To solve the problems of large current stress, difficult soft-switching of all switches, and slow dynamic response of dual active bridge converters, a multi-objective unified optimal control strategy based on triple-phase-shift control was proposed. The forward power flow global modes of triple-phase-shift control were analyzed, and three high-efficiency modes were selected to establish the analytical models of current stress and soft-switching. Combined with these models, the optimal solutions in different modes were derived by using the cost function-optimization equation to overcome the limitation of the Lagrange multiplier method, such that the DAB converter achieved the minimum current stress, and all switches operated in the soft-switching state over the entire power range. At the same time, the virtual power component was introduced in the phase-shift ratio combination, which improved the dynamic response of output voltage under the input voltage or load steps changed by power control. The theoretical analysis and experimental results show that the proposed control strategy can optimize the performance of the DAB converter from three aspects, such as current stress, soft-switching, and dynamic response, which achieves multi-objective optimization of the steady-state and dynamic performance of DAB converters.

scholarly journals Research on Marine DAB bidirectional DC converter based on DPS

2021 ◽  
Vol 248 ◽  
pp. 02064
Author(s):  
Chang Li ◽  
Xujing Tang ◽  
Zhongze Zhang ◽  
Yupeng Yuan
Keyword(s):  
Phase Shift ◽  
Power System ◽  
Control Algorithm ◽  
Power Transmission ◽  
Control Method ◽  
Mode Switching ◽  
Hybrid Power System ◽  
Current Stress ◽  
Hybrid Power ◽  
Shift Control

This paper takes the application of bidirectional DC-DC converter in Marine hybrid power system as the background, the problems of high reflow power and current stress in dual active bridge converter under traditional phase shift control are studied in this paper. Based on the dual phase shift control strategy, the power transmission optimization algorithm model is analyzed and derived, and a control method for optimizing mode switching is proposed. The optimized control algorithm is validated by Matlab/Simulink simulation experiment. The results show that the reflow power and current stress optimization control algorithm can effectively reduce the reflow power and the current stress of the converter, so as to improve the operation performance of DAB converter in high-power ship hybrid power system.

scholarly journals Optimal Strategy of Triple Phase Shift Transient DC Bias for Dual Active Bridge DC-DC Converter

2020 ◽  
Vol 185 ◽  
pp. 01088
Author(s):  
Jingyu Zhai ◽  
Fusheng Wang ◽  
Lizhong Ye ◽  
Rui Li
Keyword(s):  
Phase Shift ◽  
Optimal Strategy ◽  
Transition Process ◽  
Stable Operation ◽  
Current Stress ◽  
Dual Active Bridge ◽  
Shift Control ◽  
Bias Model ◽  
Dc Bias ◽  
Simulation Results

Under the traditional phase shift control, dual active bridge DC-DC converter (DAB) has a transient bias on the inductance current when the phase shift ratio changes suddenly, which leads to increase in the current stress of switch tubes and even unidirectional saturation of the transformer. All those will affect the stable operation of the converter. This paper focuses on quantifying the transient DC bias model on the control of triple phase shift when phase shift ratios change, and then the strategy proposed by the paper can eliminate the DC bias within one switching period and reduce current stress and response time by adjusting the drive signal during the transient transition process. Finally, the proposed strategy is verified by simulation results from Matlab/Simulink software.

scholarly journals Dual-Side Phase-Shift Control for Strongly Coupled Series–Series Compensated Electric Vehicle Wireless Charging Systems

2021 ◽  
Vol 13 (1) ◽  
pp. 6
Author(s):  
Yiming Zhang ◽  
Zhiwei Shen ◽  
Yuanchao Wu ◽  
Hui Wang ◽  
Wenbin Pan
Keyword(s):  
Phase Shift ◽  
Power Density ◽  
High Efficiency ◽  
Harmonic Approximation ◽  
Future Trend ◽  
Soft Switching ◽  
Power Transfer ◽  
Strongly Coupled ◽  
Loosely Coupled ◽  
Shift Control

Wireless power transfer (WPT) for electric vehicles is an emerging technology and a future trend. To increase power density, the coupling coefficient of coils can be designed to be large, forming a strongly coupled WPT system, different from the conventional loosely coupled WPT system. In this way, the power density and efficiency of the WPT system can be improved. This paper investigates the dual-side phase-shift control of the strongly coupled series–series compensated WPT systems. The mathematical models based on the conventional first harmonic approximation and differential equations for the dual-side phase-shift control are built and compared. The dual-side phase-shift angle and its impact on the power transfer direction and soft switching are investigated. It is found that synchronous rectification at strong couplings can lead to hard switching because the dual-side phase shift in this case is over 90°. In comparison, a relatively high efficiency and soft switching can be realized when the dual-side phase shift is below 90°. The experimental results have validated the analysis.

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