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An improved bidirectional medium voltage AC-DC converter based on 10kV silicon carbide (SiC) MOSFETs for SST (Solid State Transformer) application is presented in this paper. Avalanche breakdown of the reverse blocking silicon diode and bridge arm shoot-through problems in traditional high voltage bridge-type AC-DC converters are solved. Shoot-through currents are limited to low di/dt events that...
A novel five-level DC/AC bidirectional converter is developed and applied for interfacing renewable energy into the grid. The converter has reduced switching losses, voltage stress, harmonic distortion and electromagnetic interference caused by switching operation of power devices. The bidirectional operation feature allows it to interface with parallel dc-dc PV optimizers that requires a start-up...
The cascaded ac module integrated converter (MIC) based photovoltaic (PV) generation system features single stage power conversion with high efficiency, transformerless grid connection, and individual maximum power point tracking (MPPT). However, conventional centralized control method needs complex wire connection for transmitting data and command. In addition, the burden of the central controller...
Different modulation techniques used to control multilevel converters can be classified based on the selected converter topology and optimization goals. Among all proposed modulation methods low switching frequency modulation techniques are very popular for multilevel converters yet non-real time low switching frequency methods cannot be applied to multilevel converters with unequal or varying DC...
The traditional power switch phase leg is widely used in the power electronic devices. However, the short through of the phase leg is always a problem for reliability, efficiency, higher switching frequency. Besides, both of power device turn-on/turn-off time and the reverse recovery time of poor performance body diodes will limit the switching frequency and power conversion efficiency. This paper...
The conventional digital PWM modules satisfy the resolution requirement of the phase-shift modulation signals for the dual active bridge type converters when the switching frequency is smaller than 25kHz. However, at ultra high frequency the resolution is too low to control the converter. A high resolution digital phase-shift modulation scheme to improve the resolution of the phase-shift angle by...
DC micro-gird architecture and its control have been proposed in this paper. A bidirectional PWM rectifier is used as a backup for DC micro-grid to balance the power when the management ability of the local micro-grid is limited. A power management algorithm is also proposed based on this configuration. The DC zonal micro-grid proposed here has the advantage of maximum utilization of local distributed...
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