Capacitor Voltage Balancing for Neutral Point Clamped Dual Active Bridge Converters

Awal, MA; Bipu, Rashed Hassan; Montes, Oscar Andrés; Feng, Han; Husain, Iqbal; Yu, Wensong; Lukic, Srdjan

doi:10.1109/tpel.2020.2988272

Cited by 40 publications

(23 citation statements)

References 34 publications

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“…That is, imbalance is corrected by slightly modifying the position of the switching angles to inject or draw current from the DC-link neutral point. This imbalance correction method is applied to single-phase DAB with 3-level [164,165], 4-level [166], n-level [81,167], and three-phase 3-level DAB [168]. A different balancing method is found in [169,170] for a single-phase 3-level DAB, where different switching sequences are applied in each switching period to inject or draw current from the DC-link neutral point, depending on the sign of the DC-link voltage imbalance.…”

Section: Balance In Dc-dc Conversionmentioning

confidence: 99%

A Survey on Capacitor Voltage Control in Neutral-Point-Clamped Multilevel Converters

et al. 2022

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Neutral-point-clamped multilevel converters are currently a suitable solution for a wide range of applications. It is well known that the capacitor voltage balance is a major issue for this topology. In this paper, a brief summary of the basic topologies, modulations, and features of neutral-point-clamped multilevel converters is presented, prior to a detailed description and analysis of the capacitor voltage balance behavior. Then, the most relevant methods to manage the capacitor voltage balance are presented and discussed, including operation in the overmodulation region, at low frequency-modulation indexes, with different numbers of AC phases, and with different numbers of levels. Both open- and closed-loop methods are discussed. Some methods based on adding external circuitry are also presented and analyzed. Although the focus of the paper is mainly DC–AC conversion, the techniques for capacitor voltage balance in DC–DC conversion are discussed as well. Finally, the paper concludes with some application examples benefiting from the presented techniques.

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Section: Balance In Dc-dc Conversionmentioning

confidence: 99%

A Survey on Capacitor Voltage Control in Neutral-Point-Clamped Multilevel Converters

et al. 2022

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“…The other interesting feature of the MLI is that operations can proceed in a bidirectional mode, which allows the charging and discharging of the batteries [141,144]. The neutral point diode-clamped (NPC) dual active bridge (DAB) converter was designed in [145], and the study applied a capacitor voltage balancing method in order to facilitate voltage balancing. The two NPC legs, as shown in Figure 35, can generate five-level voltages across the primary winding of the medium frequency transformer.…”

Section: Multilevel Bidirectional Dc-dc Convertermentioning

confidence: 99%

“…The balancing methods are dependent on the direction of power flow through the DAB converter, but in this research the authors suggested a voltage balancing controller that is independent of power flow direction and does not require adjustments of active voltage vectors via the modulator. They concluded that the proposed voltage balancing approach is very and globally effective under all operating conditions of the converter [145].…”

Section: Multilevel Bidirectional Dc-dc Convertermentioning

confidence: 99%

A Review on State-of-the-Art Power Converters: Bidirectional, Resonant, Multilevel Converters and Their Derivatives

et al. 2021

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With the rapid development of modern energy applications such as renewable energy, PV systems, electric vehicles, and smart grids, DC-DC converters have become the key component to meet strict industrial demands. More advanced converters are effective in minimizing switching losses and providing an efficient energy conversion; nonetheless, the main challenge is to provide a single converter that has all the required features to deliver efficient energy for different types of modern energy systems and energy storage system integrations. This paper reviews multilevel, bidirectional, and resonant converters with respect to their constructions, classifications, merits, demerits, combined topologies, applications, and challenges; practical recommendations were also made to deliver clear ideas of the recent challenges and limited capabilities of these three converters to guide society on improving and providing a new, efficient, and economic converter that meets the strict demands of modern energy system integrations. The needs of other industrial applications, as well as the number of used elements for size and weight reduction, were also considered to achieve a power circuit that can effectively address the identified limitations. In brief, integrated bidirectional resonant DC-DC converters and multilevel inverters are expected to be well suited and highly demanded in various applications in the near future. Due to their highlighted merits, more studies are necessary for achieving a perfect level of reducing losses and components.

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“…The cascaded H-bridge (CHB), the flying capacitor (FC) and the neutralpoint-clamped (NPC) including its subtopology of active-NPC (ANPC) are the main types of conventional multilevel topologies [14]. The NPC-based configurations have the advantage of requiring only one isolated DC source but also the inconvenient that its DC-link split capacitors undergo the voltage unbalance phenomenon and consequently they need implementing balancing compensation techniques [15][16][17][18]. It is possible to get rid of this unbalancing issue by using two independent DC voltage sources instead of capacitors but at the expense of a higher cost and a bigger system complexity [19] or well in certain photovoltaic (PV) applications [20].…”

Section: Introductionmentioning

confidence: 99%

Novel Five-Level ANPC Bidirectional Converter for Power Quality Enhancement during G2V/V2G Operation of Cascaded EV Charger

et al. 2021

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This paper presents a novel single-phase (SP) active-neutral point clamped (ANPC) five-level bidirectional converter (FLBC) for enhancing the power quality (PQ) during the grid-to-vehicle (G2V) and vehicle-to-grid (V2G) operation of an electric vehicle (EV) charger connected in series. This EV charger is based on a dual-active half-bridge DC-DC converter (DAHBC) with a high frequency isolation transformer. Unlike the comparable ANPC topologies found in literature, the proposed one has two more switches, i.e., ten instead of eight. However, with the addition of these components, the proposed multilevel converter not only becomes capable of properly balancing the voltage of the DC-link split capacitors under various step-changing conditions but it achieves a better efficiency, a lower stress of the switching devices and a more even distribution of the power losses. The resulting grid-tied ANPC-SPFLBC and DAHBC are accurately controlled with a cascaded control strategy and a single-phase shift (SPS) control technique, respectively. The simulation results obtained with MATLAB-SimPowerSystems as well as the experimental results obtained in laboratory validate the proposed ANPC-SPFLBC for a set of exhaustive tests in both V2G and G2V modes. A detailed power quality analysis carried out with a Fluke 43B alike demonstrates the good performance of the proposed topology.

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Capacitor Voltage Balancing for Neutral Point Clamped Dual Active Bridge Converters

Cited by 40 publications

References 34 publications

A Survey on Capacitor Voltage Control in Neutral-Point-Clamped Multilevel Converters

A Survey on Capacitor Voltage Control in Neutral-Point-Clamped Multilevel Converters

A Review on State-of-the-Art Power Converters: Bidirectional, Resonant, Multilevel Converters and Their Derivatives

Novel Five-Level ANPC Bidirectional Converter for Power Quality Enhancement during G2V/V2G Operation of Cascaded EV Charger

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