Three‐level dual‐buck voltage balancer with active output voltagesbalancing

Zhang, Xianjin; Zhu, Hairong; Song, Ye‐Qiong; Li, Rui

doi:10.1049/iet-pel.2019.0016

Cited by 13 publications

(8 citation statements)

References 23 publications

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“…The three-level dual buck-boost voltage balancer depicted in Fig. 6 (j) presents a more complicated configuration and requires a sophisticated control strategy [34]. Nevertheless, it does not have nor the shoot-through problem neither the reactive circulating current under slightly unbalanced operations.…”

Section: A Centralized Architecturementioning

confidence: 99%

DC–DC Converters for Bipolar Microgrid Voltage Balancing: A Comprehensive Review of Architectures and Topologies

Pires¹,

Cordeiro

Roncero‐Clemente

et al. 2023

IEEE J. Emerg. Sel. Topics Power Electron.

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Section: A Centralized Architecturementioning

confidence: 99%

DC–DC Converters for Bipolar Microgrid Voltage Balancing: A Comprehensive Review of Architectures and Topologies

Pires¹,

Cordeiro

Roncero‐Clemente

et al. 2023

IEEE J. Emerg. Sel. Topics Power Electron.

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show abstract

“…These topologies have a disadvantage of relatively high current ripple in the inductor and thus require significant filtering capacitance. Besides, all these voltage balancers require additional circuits, which still causes the problems such as extra power switches, increased cost, and higher control complexity, and it will narrow down the operation power range of the system [16], [17]. The bipolar converter can also be implemented with a three-winding transformer, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Power and Voltage Control Based on DC Offset Injection for Bipolar Low-voltage DC Distribution System

Kong,

Zhang,

Zhou

et al. 2023

Journal of Modern Power Systems and Clean Energy

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The bipolar low-voltage DC (LVDC) distribution system has become a prospective solution to better integration of renewables and improvement of system efficiency and reliability. However, it also faces the challenge of power and voltage imbalance between two poles. To solve this problem, an interface converter with bipolar asymmetrical operating capabilities is applied in this paper. The steady-state models of the bipolar LVDC distribution system equipped with this interface converter in the gridconnected mode and off-grid mode are analyzed. A control scheme based on DC offset injection at the secondary side of the interface converter is proposed, enabling the bipolar LVDC distribution system to realize the unbalanced power transfer between two poles in the grid-connected mode and maintain the inherentpole voltage balance in the off-grid mode. Furthermore, this paper also proposes a primary-side DC offset injection control scheme according to the analysis of the magnetic circuit model, which can eliminate the DC bias flux caused by the secondaryside DC offset. Thereby, the potential core magnetic saturation and overcurrent issues can be prevented, ensuring the safety of the interface converter and distribution system. Detailed simulations based on the proposed control scheme are conducted to validate the function of power and voltage balance under the operation conditions of different DC loads.

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“…The applications of voltage balancers with conventional linear control systems are gaining more attention for developing bipolar DC microgrids [13][14][15][16]. For example, a simple dual-buck voltage balancer has been proposed and successfully applied in a DC microgrid in [14].…”

Section: Introductionmentioning

confidence: 99%

Continuous-Control-Set Model Predictive Control for Three-Level DC–DC Converter with Unbalanced Loads in Bipolar Electric Vehicle Charging Stations

et al. 2022

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Zero-emission transportation is currently a public priority, especially in big cities. For this reason, the use of electric vehicles (EVs) is receiving much attention. To facilitate the adoption of EVs, a proper charging infrastructure together with energy management is essential. This article proposes a design guideline for a direct current (DC) charging station with bipolar properties. A bipolar system can convert a two-wire system into three wires in a microgrid system with a neutral line. The configuration of the bipolar system supports different loads; therefore, the unbalanced operation is inherent to the system. The proposed bipolar DC charging station (CS) has a three-level balancing converter that reduces the step-down effort chargers. Moreover, this paper proposes the continuous-control-set model predictive control (CCS-MPC)-based balancing strategy that allows the handling of different output loads while keeping the neutral-line voltage efficiently regulated with improved dynamic performance compared to a traditional controller. Stability and parameter robustness analyses are also performed for the control parameter selection. To ensure the performance of the proposed method, both simulation and experimental results are presented and compared with those obtained from the traditional methods.

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Three‐level dual‐buck voltage balancer with active output voltagesbalancing

Cited by 13 publications

References 23 publications

DC–DC Converters for Bipolar Microgrid Voltage Balancing: A Comprehensive Review of Architectures and Topologies

DC–DC Converters for Bipolar Microgrid Voltage Balancing: A Comprehensive Review of Architectures and Topologies

Power and Voltage Control Based on DC Offset Injection for Bipolar Low-voltage DC Distribution System

Continuous-Control-Set Model Predictive Control for Three-Level DC–DC Converter with Unbalanced Loads in Bipolar Electric Vehicle Charging Stations

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