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Multi-phase soft-switching high-frequency isolated DC-DC converter is proposed for power conversion in modular stacked HVDC power transmission and distribution system. Input-series output-parallel connection of current-fed full-bridge DC-DC converter modules is proposed to increase voltage blocking capability at the input and decrease current ripple at the output. Basic power electronic building block is zero-current switching (ZCS) fullbridge phase-shift PWM DC-DC converter. Phase shift between switches in each leg of the converter is adjusted to control power flow while phase shift between gate signals of individual phases is selected according to the number of phases in order to minimize ripple of the output voltage. Converter analysis is carried out to develop a simple equivalent boost converter model of the three-phase soft-switching converter suitable for system-level analysis and simulation. Strategies are developed to ensure fast detection of faults and continued operation of the converter in the case of fault in one phase module. To verify the proposed system design and analysis, experimental results on scaled-down laboratory prototype are presented for a three-phase ZCS DC-DC converter. Index Terms Isolated DC-DC converter, zero-current-switching, subsea power distribution v An early version of this work has been presented at IEEE IECON 2013. Mohammadpour, A.; Parsa, L.; Todorovic, M.H.; Rixin Lai; Datta, R., "Interleaved multi-phase ZCS isolated DC-DC converter for sub-sea power distribution

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Unintentional islanding protection of distributed generation is a key function for standards compliance. For those distributed generations that use an inverter as grid interface, the function can be implemented as part of the inverter control. Existing anti-islanding schemes used in inverters have power quality and non-detection zone issues. This paper proposes a new family of schemes that have negligible power quality degradation and no non-detection zone. Design guidelines based on frequency-domain analysis is also provided. Finally, both simulation and experimental results validate the proposed schemes. 1.0-7803-8399-0/04/$20.00 8 2 W IEEE.