Quad-Active-Bridge Converter With Current Balancing Coupled Inductor for SST Application

Naseem, Nabeel; Cha, Honnyong

doi:10.1109/tpel.2021.3076460

Cited by 22 publications

(8 citation statements)

References 21 publications

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“…1. It is mainly formed of series converters made up of three singlephase (TSP) H-bridges, a three-phase shunt converter and a QAB [27] with four DC ports. One DC port (port d) of the QAB is connected with the shunt converter, while the other three ones (port a, b and c) are connected with the series converters.…”

Section: Topologies Of Three-phase C-and D-upqcmentioning

confidence: 99%

Small Signal Modeling and Performance Analysis of Conventional- and Dual-UPQC

Shi,

Liu,

Han

2024

IEEE Access

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Both the conventional and dual compensation strategies are widely adopted in a unified power quality conditioner (UPQC). However, the differences between them are lack of in-depth analysis. This article establishes the small signal models in dq-axis of conventional-and dual-UPQC (C-and D-UPQC) with consideration of the effects of the phase-locked-loop (PLL) and grid impedance, which lays the foundation for static and dynamic performance analysis. In addition, the performance of them is analyzed and compared under different conditions. It is found that: the D-UPQC has a better dynamic performance when the grid voltage or load suffers sudden variation; the harmonic rejection capabilities of the C-and D-UPQC are different; the grid impedance has an obvious influence on the load voltage quality in the C-UPQC. The findings will provide the guideline for the selection of compensation strategies in specific applications. Finally, experimental results verify the correctness of the comparative performance analysis.INDEX TERMS Unified power quality conditioner (UPQC), compensation strategies, small signal modeling, control performance analysis.

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Section: Topologies Of Three-phase C-and D-upqcmentioning

confidence: 99%

Small Signal Modeling and Performance Analysis of Conventional- and Dual-UPQC

Shi,

Liu,

Han

2024

IEEE Access

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“…It has a symmetric bidirectional power flow characteristic and less variation of switching frequency, which make the analysis of bidirectional power flow simple and the converter efficiency higher at low load, respectively. The asymmetric structure with three-input and single-output is adopted since it is the most beneficial in terms of cost and efficiency [33], [34]. Considering these features, the DC/DC converter topology adopted in this work is a quadruple CLLC (Q-CLLC) converter, as shown in Fig.…”

Section: B Dc/dc Convertermentioning

confidence: 99%

Submodule Capacitor Voltage Balancing Through High-Frequency-Side Control for Multiport MMC-Based Solid-State Transformers

Budiwicaksana,

Lee

2024

IEEE Open J. Ind. Electron. Soc.

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This paper proposes a novel submodule capacitor voltage balancing control for multiport modular multilevel converter (MMC)-based solid-state transformers (SSTs). To balance each submodule capacitor voltage, the balancing control is usually applied to the MMC. However, the low switching frequency operation and bulky arm inductance of the MMC limit the controller bandwidth and stability margin. These issues are addressed by moving the balancing control to the back-end DC/DC converter which is operated at high switching frequency. The controller gains are designed based on the small-signal model. The superiority of the proposed controller over the conventional one has been verified through Bode plot, pole-zero map, and Nyquist path analyses. Experimental results for a 2.4 kW prototype system have also verified the accuracy of the model and effectiveness of the proposed balancing control for step load changes.INDEX TERMS Balancing control, modeling, modular multilevel converters, solid-state transformer. FIGURE 1. Basic structure and application of a multiport SST.

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“…To improve the switching conditions, an EPS control method has been presented in [191] and [192], which makes the voltsecond products equal. This structure was generalized to a four-port DAB converter in [193] and [194]. For asymmetric configuration, the leakage inductors in medium voltage sides in [194] are integrated into a multi-winding coupled inductor.…”

Section: ) Multiport Dab/dab3mentioning

confidence: 99%

“…This structure was generalized to a four-port DAB converter in [193] and [194]. For asymmetric configuration, the leakage inductors in medium voltage sides in [194] are integrated into a multi-winding coupled inductor. This allows the currents to be balanced even if the power is significantly mismatched.…”

Section: ) Multiport Dab/dab3mentioning

confidence: 99%