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Due to the inherent DC fault handling ability and small transformer size, isolated modular multilevel DC-DC converter (IMMDCC) is attractive for medium- and high-voltage DC-DC conversion applications. However, with increasing of the operation frequency at the AC stage, the voltage balancing of the floating cell capacitors is a new challenge because the existing modulation and voltage balancing strategies...
Derived from the classical phase-shift control DC-DC converter, isolated modular multilevel (MML) DC-DC converter has two MMCs connected via a medium frequency AC transformer. Due to the high voltage handling ability, small transformer size, and natural ZVS soft switching this topology is attractive for medium-and high-voltage DC-DC conversion applications. However, in conventional modulation methods...
The modular multilevel converter (MMC) is one of the most promising converter topologies for medium/high-power applications. One of the technical challenges associated with the control of an MMC is the capacitor voltage balancing among arm capacitors. This paper presents a novel capacitor voltage balancing method combined with the carrier-phase-shifted pulse-width modulation (CPS-PWM) for MMC without...
In this paper the modular multilevel converter (MMC) is proposed as the wind power converter for offshore dc grids. MMC has been widely used for high-power high-voltage applications, and it is able to connect a low ac voltage source to a high dc voltage source, which makes it a promising solution for wind power converter in offshore wind farm dc grids. This paper presents the analysis and design of...
The Switched Z-source Isolated Bidirectional DC-DC Converter (SZIBDC) is a novel topology that inherits the advantages of Dual Active Bridge (DAB) while overcoming its disadvantages. This paper presents the small-signal model of open-loop SZIBDC firstly. After that, five kinds of close-loop control strategies based on PI-regulator or Fuzzy Logic Controller (FLC) are theoretically analyzed and validated...
Multi-level power converters have been widely used in wind power field systems. For multi-MW wind power converter, its efficiency and reliability are the key issues in the whole wind power generation system. Multi-level wind power converters have many power semiconductors, whose power losses and reliability have great significances to the converters' efficiency and reliability. In this paper, an optimized...
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