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To increase the voltage levels and reduce the harmonics feedback to the input source in high voltage high power application, this paper proposed one novel multilevel back to back AC-DC-AC converter. Firstly, the topology about this six level converter is introduced, which realize the neutral clamped points only by switches, and is attractive for its economy. The relationship between the multilevel...
An over modulation strategy for matrix converter (MC) is put forward on the basis of conventional AC/DC/AC MC control theory. At first, fictitious AC/DC rectifier is over modulated to get the greatest dummy DC voltage, then fictitious DC/AC inverter is modulated from linear region to six-step modes seamlessly, which effectively improve the voltage utilization. Voltage transfer ratio under different...
This paper presents a three-level AC-DC-AC Z-source converter with output voltage buck-boost capability. The converter is implemented by connecting a low-cost front-end diode rectifier to a neutral-point-clamped inverter through a single X-shaped LC impedance network. The inverter is controlled to switch with a three-level output voltage, where the middle neutral potential is uniquely tapped from...
This paper presents a space vector modulation (SVM) method for four-wire Vienna rectifier (VIENNA4). The modulator uses complex plane for modulation and treats the zero-sequence voltage reference as an offset which is realized by proper weighting of redundant vectors. The main application for VIENNA4 is a transformerless AC-DC-AC converter used in uninterruptible power supplies (UPS). The applied...
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