An any‐unit‐to‐any‐unit method for hybrid‐structured voltage equalizer in series‐connected battery/super‐capacitor strings

Du, Guangjian; Zhang, Guidong; Yu, Shenglong; Iu, Herbert Ho Ching; Lin, Weiqun; Le, Weiping; Zhang, Yun

doi:10.1002/cta.3236

Cited by 7 publications

(8 citation statements)

References 27 publications

(53 reference statements)

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“…( 4) The efficiency decreases with the increase in the resistance distance between two cells. (5) The switching loss has a significant effect on the efficiency of the SC equalization circuit when the voltage gap between two cells is small. In this case, the switching loss is mainly affected by the drain-source capacitor and drain-source voltage of the MOSFET switch as well as the switching frequency.…”

Section: Analysis Conclusion and Design Considerationsmentioning

confidence: 99%

“…The active equalization circuit can use magnetic components or capacitors to transfer energy from higher-voltage cells to lower-voltage ones. The equalization circuit based on magnetic components utilizes switching converters, such as buck-boost converter, [3][4][5][6] Cuk converter, 7,8 dual active bridge converter, 9,10 and flyback converter, 11,12 to achieve energy transfer among cells. The capacitor-based equalization circuit adopts the switched-capacitor (SC) converter to realize energy transfer among cells.…”

Section: Introductionmentioning

confidence: 99%

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Equalization circuit based on switched‐capacitor units and graph networks for series‐connected cell strings

Xiao-bing

Zhou

Liu

2023

Circuit Theory & Apps

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SummaryAn analysis and design method of the equalization circuit based on switched‐capacitor (SC) units and graph networks is proposed in this paper. In the analysis method, the SC equalization circuit is decomposed into multiple SC units and one or more graph networks, which can simplify the analysis process. The effects of circuit parameters and structure on the equalization performance are analyzed in detail. And the average resistance distance among cells is proposed to mathematically analyze and compare the equalization path of the SC equalization circuits. Based on four types of SC units and graph networks of the equalization circuit, a design method of the SC equalization circuit and two SC equalization circuits are proposed. The proposed SC equalization circuit based on cell equalization units has the optimal equalization speed. The proposed SC equalization circuit based on cell equalization units and substring equalization units implements the trade‐off between equalization speed and device number. Simulation and experimental results are provided to verify the validity of the proposed analysis method and SC equalization circuits.

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Section: Analysis Conclusion and Design Considerationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Equalization circuit based on switched‐capacitor units and graph networks for series‐connected cell strings

Xiao-bing

Zhou

Liu

2023

Circuit Theory & Apps

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“…An interesting alternative to the BESS designer is the association of electronic power pack based on different chemistries, realizing an HESS 17,31,32 . As an example, flow batteries, which have higher energy density and lower power density, can be used with lithium batteries with lower energy density and higher power density, extracting the best of both worlds.…”

Section: Battery String and Power Electronics Of A Bessmentioning

confidence: 99%

“…30 An interesting alternative to the BESS designer is the association of electronic power pack based on different chemistries, realizing an HESS. 17,31,32 As an example, flow batteries, which have higher energy density and lower power density, can be used with lithium batteries with lower energy density and higher power density, extracting the best of both worlds. This is also a good solution applied for second life battery for BESS systems, since it is possible to associate electronic power packs with different degradation levels.…”

Section: Battery String and Power Electronics Of A Bessmentioning

confidence: 99%

Battery energy management proposition for energy storage using active dc–dc converter

Maia

Kattel

Corrêa

et al. 2022

Circuit Theory & Apps

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Battery energy storage systems (BESS) are storage facilities used for ancillary services, mainly to support renewable sources operation that can reach megawatts of power. As a consequence, battery packs must be associated, and power electronics are necessary to control power flow. As a consequence, battery packs must be associated, and power electronics are necessary to control power flow, among the different design alternatives for building a BESS. This paper offers an alternative for a BESS based on a new control strategy applied to a two-stage bidirectional dc-dc converter. The proposed strategy is capable of setting the power flow through voltage/current control during operation based on real-time battery conditions, extending system life (using optimum dispatchable energy) and increasing reliability and profitability. In addition, State-of-Charge and State-of-Health are monitored, in order to keep track of aging effects. Moreover, the strategy enables mixing different battery technologies with a wide range of degradation, which can be used to retrofit operational plants or even build new systems focused on second life batteries.Simulation studies are performed using Typhoon HIL604, and a prototype is presented to validate the effectiveness of the methodology of the proposed control strategy.

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“…In Ref. [23], a voltage equalization method between cell units through hybrid-structured voltage equalizer (HSVE) was proposed.…”

Section: Introductionmentioning

confidence: 99%

New Cell Balancing Technique Using SIMO Two-Switch Flyback Converter with Multi Cells

Kim

Park

2022

Energies

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Recently, as the perception of eco-friendliness has changed, the demand for energy storage devices has been rapidly increasing due to the growth of the electric vehicle industry and smart grid facilities, which are emerging as an alternative to next-generation electricity supply and demand. Therefore, the importance of battery management technology is growing, and various voltage balancing techniques between battery cells are being studied in order to maintain high efficiency and continuous performance of batteries. This paper proposes a voltage balancing topology using a single input-multiple output (SIMO) two-switch flyback converter in a series battery configuration to resolve voltage imbalance between batteries. The characteristic of the proposed topology is that each cell on the secondary side of the two-switch flyback converter is connected to one high-frequency transformer to share the magnetic flux, and voltage balancing is performed according to the switch operation of the converter. At this time, the accumulated excess energy of the converter is refluxed to the power supply side through the freewheeling diode and converted into reactive power. The verification of the usefulness of the theoretical analysis in this paper was based on the analysis of the dynamic characteristics and steady state of the circuit through PSIM and experiments, and was conducted for one module composed of four cells.

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An any‐unit‐to‐any‐unit method for hybrid‐structured voltage equalizer in series‐connected battery/super‐capacitor strings

Cited by 7 publications

References 27 publications

Equalization circuit based on switched‐capacitor units and graph networks for series‐connected cell strings

Equalization circuit based on switched‐capacitor units and graph networks for series‐connected cell strings

Battery energy management proposition for energy storage using active dc–dc converter

New Cell Balancing Technique Using SIMO Two-Switch Flyback Converter with Multi Cells

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