Multifrequency approximation and average modelling of an isolated bidirectional dc–dc converter for dc microgrids

Huang, Jun; Wang, Yue; Li, Zhuoqiang; Liu, Wanjun

doi:10.1049/iet-pel.2015.0417

Cited by 17 publications

(11 citation statements)

References 31 publications

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“…As can be concluded from (3) and (9) that the circulating current i cir in the arm current i arm is much smaller than the HFL current i L . Thus, from (9) and 10 under DPS is always smaller than that under SPS. Therefore, compared with SPS, the DPS is a more effective strategy to reduce the RMS value of currents on switches, thus reducing the current stress in MDCT.…”

Section: Current Stress Characterisationmentioning

confidence: 89%

“…Among the various topologies for DC/DC converters, the dual-active-bridge (DAB) DC/DC converter attracts attention from engineers and researchers. It has been thoroughly studied and greatly improved in terms of topologies, power characteristics, soft switching behaviour, efficiency characteristics, dead-time influence and control strategies [6][7][8][9][10][11]. Moreover, to satisfy the voltage and power capacity requirements of MVDC and HVDC distribution networks, series-input parallel-output topologies based on DAB have gained special interest [12,13].…”

Section: Introductionmentioning

confidence: 99%

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Analysis and optimisation of modulation strategy based on dual‐phase‐shift for modular multilevel high‐frequency‐link DC transformer in medium‐voltage DC distribution network

Wang

Song

Zhao

et al. 2018

IET Power Electronics

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DC/DC converters are crucial in DC distribution networks for converting voltage and interconnecting different voltage links. The modular multilevel high-frequency-link DC transformer (MDCT), which employs multiplex conversion principle and provides many advantages, realises voltage conversion, power transfer and electrical isolation between links in medium-voltage DC distribution networks. To improve the performance of MDCT, this study investigates the modulation with the phase-shift strategy and its influence on current stress, power characteristic and efficiency characteristic of MDCT. Besides, to simultaneously achieve an optimal solution for both current stress and efficiency characteristics of MDCT, an optimal modulation strategy based on dual-phase-shift is proposed. Finally, an MDCT prototype is constructed and experimental results verify the correctness and effectiveness of the analysis and proposed scheme.

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Section: Current Stress Characterisationmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Analysis and optimisation of modulation strategy based on dual‐phase‐shift for modular multilevel high‐frequency‐link DC transformer in medium‐voltage DC distribution network

Wang

Song

Zhao

et al. 2018

IET Power Electronics

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“…Substituting the expression of transmission power in Table 1 into Equation (26) to eliminate the variable φ, the optimized control parameters can be derived:…”

Section: Minimum Backflow Power Conrtrol At High Power Levelmentioning

confidence: 99%

“…Non-active power transmission time t pna , t sna and effective power transmission time t e in these modes are listed in Table A2. Similar to [10,26], a numerical method is used to help to find the optimized operation mode. The values of t e in mode 5C under different transmission power k are depicted in Figure A2.…”

Section: T Pzmentioning

confidence: 99%

Backflow Power Optimization Control for Dual Active Bridge DC-DC Converters

Xiong

Hao

et al. 2017

Energies

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This paper proposes optimized control methods for global minimum backflow power based on a triple-phase-shift (TPS) control strategy. Three global optimized methods are derived to minimize the backflow power on the primary side, on the secondary side and on both sides, respectively. Backflow power transmission is just a portion of non-active power transmission in a dual active bridge (DAB) converter. Non-active power transmission time is proposed in this paper, which unifies zero power transmission and backflow power transmission. Based on the proposed index, an optimized control method is derived to achieve both the maximum effective power transmission time and minimum current stress of DAB at the same time. A comparative analysis is performed to show the limitations of the minimum backflow power optimization method. Finally, a prototype is built to verify the effectiveness of our theoretical analysis and the proposed control methods by experimental results.

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“…In [5], a state-space average model was developed numerically for the converter operating in DCM and CCM. A new method for modeling resonant DC-DC converters using multi-frequency approximation was developed in [6], while the work in [7] presented a continuous-time average modeling of a dual active bridge DC-DC converter. Problems associated with modeling the switched-capacitor DC-DC were examined in [8].…”

Section: Introductionmentioning

confidence: 99%

Adaptive Control of Four-Quadrant DC-DC Converters in Both Discontinuous and Continuous Conduction Modes

et al. 2020

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The inherently different dynamics of a DC-DC converter while operating in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM) necessitate an advanced controller to control the inductor current. A conventional PI controller cannot be used across both modes since it does not guarantee a smooth transition between both modes. Furthermore, in time-varying input-output voltage applications of the four-quadrant converter such as in battery charging applications, the location of the boundary between the CCM and the DCM changes dynamically, creating an uncertainty. Therefore, a robust controller is required to accurately track the inductor current in the presence of uncertainties. Thus, an adaptive controller is proposed in this work, which is based on the general inverse model of the four-quadrant converter in both modes. Moreover, gain scheduling is used to switch the parameters of the controller as the converter transits between the DCM and the CCM. The adaptability and effectiveness of the controller in ensuring a smooth transition is validated by numerical simulations conducted on various converter topologies. Experimental results are also presented for a buck converter.

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Multifrequency approximation and average modelling of an isolated bidirectional dc–dc converter for dc microgrids

Cited by 17 publications

References 31 publications

Analysis and optimisation of modulation strategy based on dual‐phase‐shift for modular multilevel high‐frequency‐link DC transformer in medium‐voltage DC distribution network

Analysis and optimisation of modulation strategy based on dual‐phase‐shift for modular multilevel high‐frequency‐link DC transformer in medium‐voltage DC distribution network

Backflow Power Optimization Control for Dual Active Bridge DC-DC Converters

Adaptive Control of Four-Quadrant DC-DC Converters in Both Discontinuous and Continuous Conduction Modes

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