Abstract
The rise of new dc technologies is pushing the development of highly efficient dc-dc converters, especially at high voltage and high step ratio. Modular multilevel converters (MMCs) are an attractive alternative because they can manage medium and high dc voltages with standard semiconductor devices with high efficiency if they employ soft-switching techniques. However, the latest soft-switching techniques have been proposed for fixed voltage range, limiting their operation. This paper proposes a soft-switching modulation for the high step ratio Modular Multilevel dc-dc Converter in extended voltage range. The proposal achieves zero-current switching and regulates the voltage balance among the floating cell capacitors, while using a simple control scheme to regulate the output voltage. The theoretical analysis has been verified with full-scale simulations, demonstrating excellent dynamic response and reduced rms current.
Highlights
The latest developments in power electronics have allowed the rise of new technologies and the resurgence of dc power systems, due to their increased use in HVDC transmission systems [1], photovoltaic solar power [2], offshore wind farms [3], battery energy storage systems [4], data centers [5], electric vehicles [6] and fast chargers [7]
This paper proposes a zero-current switching (ZCS) modulation for the high step ratio Modular Multilevel dc-dc Converter, extending triangular current modulations (TCM) to a variable output voltage operation and a flexible stack modulation
The nonlinear optimisation problem (NLP) solver block of the control scheme is implemented as a set of equations (Table I) and the control map which select the operation mode at steady-state
Summary
The latest developments in power electronics have allowed the rise of new technologies and the resurgence of dc power systems, due to their increased use in HVDC transmission systems [1], photovoltaic solar power [2], offshore wind farms [3], battery energy storage systems [4], data centers [5], electric vehicles [6] and fast chargers [7] In this scenario, the dc-dc converters are the enabling technology for the development of the new electrical infrastructure and the establishment of dc grids. This paper proposes a zero-current switching (ZCS) modulation for the high step ratio Modular Multilevel dc-dc Converter, extending TCM to a variable output voltage operation and a flexible stack modulation.
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