Compensation of asymmetric transformers in high-power DC-DC converters

Soltau, Nils; Engel, Stefan P.; Stagge, Hanno; Doncker, Rik W. De

doi:10.1109/ecce-asia.2013.6579243

Cited by 10 publications

(3 citation statements)

References 8 publications

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“…3, with one converter acts as reference that defines the ac voltage and frequency in the internal ac-link, and other converter controls dc power or dc voltage. Although high-frequency square waveform voltage operation of VSC1 and VSC2 has been adopted in low and medium voltage applications for many years [59][60][61][62][63][64], sinusoidal or trapezoidal (quasi-two-level) voltage waveform in the ac-link with fundamental frequency ranging from 200Hz to 500Hz is likely to be adopted in HVDC applications, with dc operating voltages up to 800kV [58,65,66].…”

Section: Front-to-front Dc-dc Converter Topologymentioning

confidence: 99%

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Review of technologies for DC grids – power conversion, flow control and protection

Adam

Vrana

et al. 2019

IET Power Electronics

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This article reviews dc transmission technologies for future power grids. The article emphasizes the attributes that each technology offers in terms of enhance controllability and stability, resiliency to ac and dc faults, and encourage increased exploitations of renewable energy resources (RERs) for electricity generation. Discussions of ac/dc and dc/dc converters reveal that the self-commutated dc transmission technologies are critical for better utilization of large RERs which tend to be dispersed over wide geographical areas, and offer needed controllability for operation of centralized and decentralized power grids. It is concluded that the series power flow controllers have potential to restrict the expensive isolated dc/dc converters to few applications, in which the prevention of dc fault propagation is paramount. Cheaper non-isolated dc/dc converters offer dc voltage tapping and matching and power regulation but they are unable to prevent pole-shifting during pole-to-ground dc fault. To date hybrid dc circuit breakers target dc fault isolation times ranging from 3ms to 5ms; while the resonance-based dc circuit breakers with forced current zeros target dc fault clearance times from 8ms to 12.5ms.

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Section: Front-to-front Dc-dc Converter Topologymentioning

confidence: 99%

“…The F2F dc–dc converter is described in [57–62]. The converter terminals VSC 1 and VSC 2 can employ any of the converter topologies summarised in Figs.…”

Section: Dc–dc Convertersmentioning

confidence: 99%

Review of technologies for DC grids – power conversion, flow control and protection

Adam

Vrana

et al. 2019

IET Power Electronics

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“…8 shows typical zero-voltage switching (ZVS) boundaries of a dual-active bridge converter as a function of the voltage ratio and the output power, where U in is the input voltage, U out the output voltage, r tr the transformer turns ratio, P rat,max the maximum rated power and I rms the RMS current in the transformer. The boundaries are determined by the design of the converter, i.e., the leakage inductance and the switching frequency, and are strongly influenced by the dead time, the magnetizing current and the output capacitance of the semiconductors [22], [27], [30]. Obviously, the dual-active bridge converter suffers from large hard-switching areas at unequal voltage ratios diminishing the efficiency of the converter.…”

Section: Galvanically Isolated Dc-dc Convertersmentioning

confidence: 99%

Key Components of Modular Propulsion Systems for Next Generation Electric Vehicles

et al. 2017

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Abstract-The objective of this paper is to provide an overview of emerging technologies for modular power converter architectures for electric vehicles. Nowadays, the most common electrical drive-train architecture exhibits one single inverter which is directly tied to the battery. As a consequence, only one high-voltage battery module can be applied and the dc-link voltage of the inverter and its apparent power rating is directly dependent on the available battery voltage. To overcome this restriction, modern power converter architectures with a higher degree of freedom have been proposed. These architectures exhibit modular dc-dc converters to allow different battery technologies to be linked to drive inverters operating independently from each other. To make this development feasible, new components and technologies are evolving which enhance the efficiency over mission cycles while ensuring further integration of the power-converter architectures.Wide-bandgap power semiconductors enable high switching frequencies and miniaturization of passive devices. Smart topology enhancements and control methods allow a significant loss reduction, in particular at light loads, resulting in a higher efficiency of the drive train over the entire driving cycle. Highly integrated bidirectional battery charger systems with intelligent charging strategies inhibit battery degradation and provide opportunities for grid stabilization. It is demonstrated how these technologies are realized and implemented to contribute to the development of future electric vehicles.

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Avoiding Currents Overshoot in IPOP DAB System

Rolak

2019

2019 IEEE International Conference on Industrial Technology (ICIT)

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Compensation of asymmetric transformers in high-power DC-DC converters

Cited by 10 publications

References 8 publications

Review of technologies for DC grids – power conversion, flow control and protection

Review of technologies for DC grids – power conversion, flow control and protection

Key Components of Modular Propulsion Systems for Next Generation Electric Vehicles

Avoiding Currents Overshoot in IPOP DAB System

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