Dynamic and static performance optimization of dual active bridge DC-DC converters

Hou, Nie; Song, Wensheng; Zhu, Yutong; Xiao, Sun; Li, Wei

doi:10.1007/s40565-017-0343-7

Cited by 25 publications

(11 citation statements)

References 24 publications

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“…14, where a load power step increase from 112.5kW to 225kW is triggered at t = 0.4 s. All these variables present significant oscillation phenomenon, demonstrating that the original MMDCT system is underdamped as explained in Section II. Note the oscillation frequency is around 729 rad/s that is consistent with the theoretical analysis in (16), verifying the correctness of the quantitative analysis of the oscillation mechanism. Since the decay rate of the transient oscillation correlates to the product of ξ and ωn, the oscillation will disappear after a long time if there is no load change.…”

Section: A Transient Response Results Without Using the Proposed Consupporting

confidence: 84%

Transient Oscillation Suppression Method of Modular Multilevel DC Transformer

Lyu

Sun

et al. 2020

IEEE Access

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The modular multilevel DC transformer (MMDCT) is more likely to suffer from transient oscillation, which is caused by insufficient damping of the equivalent RLC circuit with smaller arm resistance and submodule capacitance and may threaten the system stability. To tackle this issue, this paper conducts an in-depth analysis of the oscillation generating mechanism and thereby proposes a transient oscillation suppression method by incorporating an oscillation suppression angle (OSA) between the upper and lower arm switching voltages, with which the direction of the circulating current could be adjusted during this overlapped period. However, the open loop control of OSA shows indistinctive improvement of the damping ratio so that a damping compensator for regulating the circulating current is utilized. Furthermore, the compensating gain is optimally designed to achieve the critical damping state based on the small-signal model viewing OSA as an input variable. Besides, the outer capacitor voltage control loop and the power control loop are incorporated to provide the circulating current reference and to track the load power demand, respectively. Extensive simulation results from a realistically designed MMDCT model in PSIM validate the feasibility and effectiveness of the proposed transient oscillation suppression method. INDEX TERMS Modular multilevel DC transformer, damping compensation, oscillation suppression, interarm phase shift angle, controller design.

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Section: A Transient Response Results Without Using the Proposed Consupporting

confidence: 84%

Transient Oscillation Suppression Method of Modular Multilevel DC Transformer

Lyu

Sun

et al. 2020

IEEE Access

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“…It provides a simple closed form implementation for the primary and secondary side phase shift angles. This HPS modulation has the advantages of EPS and TPS modulations [17].…”

Section: Hybrid Phase Shift (Hps) Modulationmentioning

confidence: 99%

An improved closed loop hybrid phase shift controller for dual active bridge converter

Narasimha¹,

Salkuti

2020

IJECE

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In this paper, a new closed loop hybrid phase shift control is proposed for dual active bridge (DAB) converter with variable input voltage. The extended phase shift (EPS) control is applied when load gets heavy enough and the secondary side phase shift angle decreases to zero. When this modified DAB converter operates at light loads, the triple phase shift (TPS) modulation method is applied, and the added control freedom is the secondary phase shift angle between the two-secondary side switching legs. The hybrid phase shift control (HPS) scheme is a combination of EPS and TPS modulations, and it provides a very simple closed form implementation for the primary and secondary side phase shift angles. Depending on the application by changing the phase shift angles we can achieve Buck or Boost operation. A characteristic table feedback control method has been used for closed loop operation. By using 1D look up table the proposed DAB converter provides constant 400V for any given input voltage.

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“…By solving AC part in (9) for the DAB converter model and then applying Laplace transform, I L can be written as:…”

Section: A Plant Model In Dab Schemementioning

confidence: 99%

“…The elimination of the reactive current, i. e., a reactive current (I Q = 0) in DAB converters presents multiple advantages [7]: ① HFT volume reduction, due to the decrease in the root mean square (RMS) current; ② the lowering of current stress on power semiconductors; ③ the decrease in capacitor value due to I DC2 ripple current reduction. These advantages of high efficiency and high power density have motivated the development of different modulation techniques for DAB converters, which are based on the combination of phase shift Δφ and μ [8], [9].…”

Section: Introductionmentioning

confidence: 99%

Small-signal Model for Dual-active-bridge Converter Considering Total Elimination of Reactive Current

Rodriguez-Rodrıguez

Salgado-Herrera

Tórres-Jiménez

et al. 2021

Journal of Modern Power Systems and Clean Energy

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Emerging technologies such as electric vehicles, solid-state transformers, and DC transformers are implemented using the closed-loop bi-directional dual-active-bridge (DAB) converter. In this context, it is necessary to have average models that provide an efficient way of tuning the proportional integral (PI) compensator parameters for large-and small-signal applications. We present a novel small-signal model (SSM) for DAB converter with a single closed-loop PI controller and the total elimination of reactive current (I Q = 0). The method applies a modulation technique for I Q = 0 and introduces a composite function in the controller while reducing the original nonlinear switching model, which allows to decrease the order of the transfer function and analyze the closed-loop operation. The proposed SSM is analyzed using different response time, load, and DC voltage changes. The simulation and experimental results demonstrate the ease of implementation and effectiveness of the proposed model with respect to other SSM techniques.

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Dynamic and static performance optimization of dual active bridge DC-DC converters

Cited by 25 publications

References 24 publications

Transient Oscillation Suppression Method of Modular Multilevel DC Transformer

Transient Oscillation Suppression Method of Modular Multilevel DC Transformer

An improved closed loop hybrid phase shift controller for dual active bridge converter

Small-signal Model for Dual-active-bridge Converter Considering Total Elimination of Reactive Current

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