Development of a Modular High-Power Converter System for Battery Energy Storage Systems

Stephan, T.; Stieneker, Marco; Doncker, Rik W. De

doi:10.1080/09398368.2013.11463844

Cited by 23 publications

(23 citation statements)

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“…While the basic trade-offs between conduction and switching losses have been briefly addressed in [8] and [29], and while [36] analyzed power density benefits of multilevel approaches for low power applications, in the approach that is presented here, both, efficiency and power density are considered together. η-ρ Pareto analysis [37] is a feasible way of quantifying the trade-offs outlined above, and summarized in Table I, in a comprehensive way.…”

Section: Optimum Number Of Cascaded Converter Cellsmentioning

confidence: 99%

“…Cascading of H-bridge cells (CHB) has been patented for the first time in the 1970ies [27], [28]. It has been used in a wide range of high power applications such as railway drive systems [8]- [11] or smartgrid applications [15], [29]. Instead of cascading H-bridges, cells featuring two NPC legs could be employed, creating a cascaded NPC-bridge converter (CNB) [30].…”

Section: Introductionmentioning

confidence: 99%

“…1(c)) do. The modular multilevel converter (MMC) [31], [32] or battery storage applications [29] should be named as exceptions here, though. In case of SSTs, the DC supply for the individual cells is usually implemented by means of isolated DC/DC converters operating in the medium-frequency range, whereas for drives also solutions employing multi-winding transformers and passive rectification are considered.…”

Section: Introductionmentioning

confidence: 99%

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Optimum number of cascaded cells for high-power medium-voltage multilevel converters

Huber

Kolar

2013

2013 IEEE Energy Conversion Congress and Exposition

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When power electronic systems are connected to the medium-voltage grid, often multilevel topologies consisting of a number of cascaded converter cells are considered. For a given grid voltage level, either few cells featuring semiconductors with high blocking voltage capability or many cells using lowvoltage semiconductors can be employed. This paper proposes efficiency/power density (η-ρ) Pareto analysis to comprehensively identify the optimum number of cascaded cells. Recent advances in silicon carbide (SiC) semiconductor technology point towards devices with blocking voltages exceeding 15 kV. The switching characteristics that hypothetical SiC devices would have to provide in order to realize a simple single-stage full-bridge converter competitive to a multilevel solution are derived and found to be impracticably fast. Furthermore, it is shown that reliability concerns arising with increasing number of cascaded cells can be mitigated by means of redundancy.

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Section: Optimum Number Of Cascaded Converter Cellsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimum number of cascaded cells for high-power medium-voltage multilevel converters

Huber

Kolar

2013

2013 IEEE Energy Conversion Congress and Exposition

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“…Recent trends in control technology for modular converter-based ESS include satisfying diverse consumer needs and cutting maintenance and replacement costs [10][11][12]. To ensure the continued normal operation of ESS while enabling the repair and replacement of their components requires the establishment of a hot-swap system, along with technologies for its operation [13,14].…”

Section: Introductionmentioning

confidence: 99%

Hot-Swappable Modular Converter System Control for Heterogeneous Batteries and ESS

Cha

Choi

et al. 2018

Energies

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This study proposes a modular bidirectional converter system for hot-swappable energy storage systems (ESSs). The proposed modular converter has a four-leg interleaved structure, and therefore it can reduce input current ripples and is suitable for secondary cells. Moreover, if any of the legs fails, hot-swap is available through phase control inside the converter. The modular converter uses an independently controllable battery as an input power source, allowing the charge and discharge control according to each stated of charge (SOC). The output voltage of the converter circumvents the module in the event of a high-voltage output control and a fault (exchange due to battery life, repair of converter) through the cascade-type bypass, thereby enabling continuous operation. The hot-swap operation of the proposed modular ESS converter system and the charge and discharge control algorithm according to battery SOC are verified by experiment.

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“…Modular converters (also known as multiphase converters or composite converters) are formed by several converters (called here modules) connected in a particular arrangement (series, parallel or cascade) to take advantage of the reduction of current or voltage stress, in comparison with a stand-alone converter [19]- [21]. The Input Parallel Output Parallel (IPOP) connection has been widely used in DC-DC power converters in combination with an interleaved control [22]- [25].…”

Section: Introductionmentioning

confidence: 99%

Advanced Control Techniques to Improve the Efficiency of IPOP Modular QSW-ZVS Converters

Vázquez

Rodríguez

Lamar

et al. 2018

IEEE Trans. Power Electron.

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Abstract--Quasi-Square Wave mode with Zero Voltage Switching (QSW-ZVS) is an operation mode in which the switching losses can be minimized. However, a large inductance current ripple is needed in this mode, which limits the maximum attainable power of the topology. A possible way to increase the power managed by a QSW-ZVS mode converter is to use a modular converter. An Input Parallel Output Parallel (IPOP) arrangement, in which the current can be shared among the modules, can increase the total power proportionally to the number of modules. This paper addresses two main proposals. The first one is a master-slave technique to extend the QSW-ZVS mode to an IPOP modular converter, achieving an interleaved solution which minimizes the total input current ripple and assures the current balance among the modules. The second one is a comparison of four different control techniques applied to the IPOP modular converter to improve the overall efficiency at light to medium load: balanced master-slave technique, master-slave with phase-shedding, asymmetrical master-slave and burst mode (or hysteretic control). These four strategies are theoretically analyzed, experimentally validated and compared using a 150V to 400V 2kW modular IPOP prototype made up of four synchronous boost converter operating in QSW-ZVS mode.

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Development of a Modular High-Power Converter System for Battery Energy Storage Systems

Cited by 23 publications

References 0 publications

Optimum number of cascaded cells for high-power medium-voltage multilevel converters

Optimum number of cascaded cells for high-power medium-voltage multilevel converters

Hot-Swappable Modular Converter System Control for Heterogeneous Batteries and ESS

Advanced Control Techniques to Improve the Efficiency of IPOP Modular QSW-ZVS Converters

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