Modeling, Control, and Operation of an M-DAB DC–DC Converter for Interconnection of HVDC Grids

Yazdi, Seyed Saeid Heidari; Rouzbehi, Kumars; Carrizosa, Miguel Jiménez; Heidary, Amir; Bagheri, Mehdi

doi:10.1109/jsyst.2023.3235249

Cited by 8 publications

References 34 publications

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A novel PWM plus phase shift modulation strategy for three‐level isolated dual‐active‐bridge DC–DC converters

Cheng,

Sun,

et al. 2024

IET Power Electronics

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A hybrid‐three‐level isolated dual‐active‐bridge (HTDAB) DC–DC converter is widely used for grid‐interactive power converters. However, a traditional extended‐phase‐shift (EPS) modulation scheme would cause voltage‐level‐disorder (VLD) problems in HDAB DC–DC converter system because the output voltage of HTDAB would be clamped at a high‐ or low‐level during power transmission when the inductor current changes directions. Thus, the zero voltage sequence of the HTDAB cannot be stably maintained under EPS control, which not only leads to a significant difference between the actual transmission power and the target output power but also seriously affects the stability of the system control. To address this limitation, the reasons leading to VLD are analysed in detail, that is, an inappropriate PWM switching sequence at the output zero voltage level would occur under EPS control. Then, a novel PWM plus phase shift (PPS) modulation strategy is proposed, which can eliminate VLD completely. Finally, an experimental prototype is built to verify the effectiveness of the proposed PPS modulation scheme. The experimental results demonstrate that the PPS modulation method proposed in this article can effectively eliminate level disturbances and improve system stability.

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A novel PWM plus phase shift modulation strategy for three‐level isolated dual‐active‐bridge DC–DC converters

Cheng,

Sun,

et al. 2024

IET Power Electronics

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An accurate small‐signal model of a low‐side active clamp forward converter and stability assessment in hard‐ and soft‐switching operations

Oluwasogo,

Konrath

2024

IET Power Electronics

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This article examines the internal stability of an active clamp forward converter (ACFC) from a non‐linear system and arbitrary changes in the state variable's point of view. The analysis is based on the Lyapunov direct method in conjunction with the operating theory of the ACFC. The equivalent circuit with the state equations is established and their stability is assessed in consideration of the hard‐ and soft‐switching operations using the Lyapunov energy function approach in a piecewise manner. In addition, averaged switch modelling is applied explicitly to derive a more accurate small‐signal model of a low‐side ACFC. The study revealed the presence of a non‐minimum phase problem as the major adverse effect on the stability feature of the ACFC predesigned with soft‐switching capability. The instability of ACFC is related to the magnetising inductance () value (core loss resistance) which influences/determines the hard‐ or soft‐switching operations of the ACFC. Hardware prototype was developed with two different transformers having distinct values of for hard‐ and soft‐switching operations. From the experimental frequency measurement, the model accurately predicts the movement of the complex zeros from the left‐half‐plane (LHP) to the right‐hand‐plane (RHP) as the ACFC changes from the hard‐switching to a soft‐switching operation.

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HVDC grids stability enhancement through the integration of battery energy storage systems

Azizi

CheshmehBeigi

Rouzbehi

et al. 2023

IET Renewable Power Gen

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In high voltage direct current (HVDC) grids, the reference values of power controllers are normally adjusted based on the DC‐link voltage as the DC voltage is regulated by the droop controllers. As a matter of fact, except for the DC slack bus, there is a trade‐off between power‐sharing and voltage regulation of all the remaining HVDC buses. The main issue with this control strategy is that in case of contingencies, significant voltage and power oscillations throughout HVDC grids can be expected. To address such issues, the integration of a battery energy storage system into HVDC grids through a multi‐port DC/DC power converter is investigated in this paper. The DC/DC converter used in this paper consists of three ports: (1) two ports are connected in cascade with the intended DC transmission line, formerly named cascaded power flow controller, and (2) the third port is for the integration of the battery energy storage system to form a multi‐functional device. Therefore, the proposed framework can potentially achieve small‐signal stability enhancement and regulate/adjust the power throughout the HVDC grids.

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Modeling, Control, and Operation of an M-DAB DC–DC Converter for Interconnection of HVDC Grids

Cited by 8 publications

References 34 publications

A novel PWM plus phase shift modulation strategy for three‐level isolated dual‐active‐bridge DC–DC converters

A novel PWM plus phase shift modulation strategy for three‐level isolated dual‐active‐bridge DC–DC converters

An accurate small‐signal model of a low‐side active clamp forward converter and stability assessment in hard‐ and soft‐switching operations

HVDC grids stability enhancement through the integration of battery energy storage systems

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