Journal of Modern Power Systems and Clean Energy

ISSN 2196-5625 CN 32-1884/TK

Small-signal Model for Dual-active-bridge Converter Considering Total Elimination of Reactive Current
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1.Universidad Nacional Autónoma de Mexico, Facultad de Ingeniería, Depto. Energía Electrica. Av. Universidad 3000, Col. UNAM CU, Coyoacán, CDMX, Mexico;2.Instituto de Energías Renovables, Universidad Nacional Autónoma de Mexico, Priv. Xochicalco s/n, Col. Centro, Temixco, Morelos, Mexico;3.Instituto Tecnológico Superior de Irapuato, Carretera Irapuato-Silao km 12.5. Irapuato, Guanajuato, Mexico;4.Universidad Autónoma de Querétaro, Campus San Juan del Rio, Rio Moctezuma 249, San Juan del Río, Querétaro, Mexico

Fund Project:

This work was supported in part by the Support Program for Research Projects and Technological Innovation PAPIIT-UNAM (No. DGAPA-PAPIIT-TA100718).

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    Abstract:

    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 (IQ=0). The method applies a modulation technique for IQ=0 and introduces a composite function in the controller while reducing the original non-linear 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.

    表 2 Table 2
    表 3 Table 3
    表 1 Table 1
    图1 Topology and applications of DAB.Fig.1
    图2 Equivalent circuit of DAB converter.Fig.2
    图4 Controller and plant model for DAB converter using PVM.Fig.4
    图5 Controller and plant for average DAB converter model using PVM.Fig.5
    图6 Controller and plant for reduction of average DAB converter.Fig.6
    图7 Controller and plant for reduction of average DAB converter.Fig.7
    图3 Main value of VL, IL, IDC2 and IAV for PVM.Fig.3
    图8 Simulation results for dynamics of closed-loop DAB converter. (a) Step response for τ=0.1 s. (b) Step response for τ=0.01 s. (c) Wave forms of VDC2, VP, VS, and IL in steady state. (d) Wave forms of VDC2, Δφ, IDC2, and IDC2,mean in steady state. (e) VDC2 and PDC2 for step response, step load, and VDC2,ref change.Fig.8
    图9 Experimental results of closed-loop DAB prototype for τ=0.1 s. (a) Step response of VDC2 and IDC2. (b) Step response of VDC2 and IDC2. (c) Step response of VDC2, VP, VS, and IL. (d). Step response of VDC2, IDC1, IDC2, and IL. (e) Step response of VDC2 and IL. (f) Step response of VDC2 and IL.Fig.9
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History
  • Received:January 01,2019
  • Online: March 22,2021