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Single phase uninterruptible power supply (UPS) has been widely used for a variety of critical load to overcome the disruption in utility power supplies. Wide band gap (WBG) power semiconductor devices, such as Silicon Carbide (SiC) finds its application in UPS systems due to its higher switching frequency, lower losses, and higher power density compared to Si devices. In this paper, a full SiC-based...
This paper compares the unbalanced load correction capacity between four different PET topologies: the SPC modular topology, the CPC modular topology, the modular self-balancing topology and a proposed MAB based self-balancing topology. The theoretical analysis show that the SPC and CPC can only achieve unbalanced load compensation within a limited range and both of them require additional power rating...
Power electronic transformer(PET) has been the focus of interest in recent years. Compared with conventional low frequency transformers, PETs can offer many additional functions such as phase shifting, frequency shifting and reactive power/harmonic compensation. This paper proposes a single phase PET for the Scott railway power system. The PET achieves active power control which balances the Scott's...
The conventional droop control method, which does not require communication lines, is an effective control scheme to dispatch power among inverters in the microgrid. However, this method has inherent tradeoffs: frequency vs. active power accuracy and amplitude regulation vs. reactive power sharing accuracy. To cope with this problem, this paper presents a novel active power control strategy to improve...
This paper presents a decoupled and adaptive droop strategy to coordinate parallel operation of inverters. This strategy neatly combines a novel decouple method and an adaptive power sharing strategy. The decouple method guarantees the system stability by defining a pair of virtual power and utilizing a low pass filter to achieve dynamic decoupling. And the adaptive power sharing method is included...
Power Electronic Transformer (PET) is one of the key elements for the future power electronics based power supply systems, especially in renewable energy field. In this paper, a series of new three-stage three-phase cascaded modular topologies comprising distinct AC-DC, DC-DC and DC-AC stages for large power rating PET are proposed. Comparisons of these topologies based on efficiency, cost, redundancy,...
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