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Parameter identification for dual‑phase shift modulated DAB converters
Tan‑Quoc Duong,Sung‑Jin Choi 전력전자학회 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.12
Deadbeat control is an effective method for controlling the output voltage of dual active bridge converters. However, its effectiveness depends on the model parameter accuracy. In practice, the model parameters of dual active bridge converters vary depending on the operation conditions, manufacturing tolerances, and calendar aging. This leads to performance degradation and causes steady-state errors of the output voltage. To overcome the effect of parameter mismatch, this study proposed an algorithm to achieve the online identification of two model parameters, i.e., the series inductor and the output capacitor. Based on a least-squares analysis, the online parameter identification of a dual active bridge converter under dualphase shift modulation is implemented to obtain the actual values of model parameters. Consequently, the steady-state errors of the output voltage are immediately mitigated after every sampling period when the optimal predicted phase shift duty ratios are updated. The proposed algorithm was tested through both simulations and experiments to verify its effectiveness.
Deadbeat Control with Current Stress Optimization for Extended Phase-Shift Modulated DAB Converter
Tan-Quoc Duong,Sung-Jin Choi 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
Current stress optimization (CSO) is known to be a promising approach for the dual active bridge (DAB) converter. It requires a proportional-integral (PI) controller to the phase-shift ratio for compensating to control the output voltage. However, tuning the PI gain is challenging and lacks a guide due to the complexity of the plant. Besides, achieving the minimum current stress is another restriction caused by the PI controller. To solve this deficiency, this study proposes a complete deadbeat control with CSO extended phase-shift (EPS) modulation for the DAB converter, which can eliminate the PI compensator, thus, reducing the number of tuning parameters. Besides, the proposed method shows that the dynamic response performance is superior to the existing method. In addition, the inductor current is always kept at its minimum value. Simulation results of a 260 W converter prototype demonstrate the advantages of the proposed method under various operating situations.