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This work describes the operation of commercial 4H-SiC Junction-Barrier Schottky (JBS) Diodes at extreme voltage slew rates (dV/dt) in an attempt to force failures. Slew rates in excess of 700 kVμs were required to damage parts, in combination with high values of the reverse bus voltage. Cryogenic temperatures reduced the maximum bus voltage required to induce failure. Large quantities of parts were...
In this paper, the operation of a single phase medium voltage Solid State Transformer (SST) is presented. With the new development of high voltage wide band gap semiconductor devices, particularly the SiC MOSFETs and JBS diodes, SSTs that are suitable for distribution grid can be developed with simpler topology and reduced device number. Features such as renewable energy integration, grid voltage...
This paper presents the operation and control of the rectifier stage of a medium voltage solid state transformer (SST). As an alternative scheme to integrate DG at distribution grid, the grid-connected operation of SST needs to be analysed. By defining the P-Q diagram of SST's rectifier stage, component selection such as dc link capacitor can be evaluated in respect to allowable dc ripple voltage...
This paper presents the development of a distribution network solid state transformer (SST) based on high voltage (13kV) SiC MOSFET and JBS diode. This distribution SST is composed with a medium voltage ac/dc rectifier, medium voltage medium frequency dc/dc converter and a low voltage inverter. It's able to be interfaced to 3.6kV distribution grid and output both a 400V dc and 240/120V ac. This paper...
In contrast to traditional 60 Hz transformer, solid state transformer (SST) offers power flow control, integration of renewables and maintaining grid stability in high renewable penetration scenario. Like a typical power converter, SST requires low voltage (24 V dc) power for its control and sensing circuits. In running condition, this power is derived from its low voltage dc bus at 400 V. But it...
This paper introduces a high performance controller for voltage source converter (VSC) used as front-end interface of solid state transformer (SST). The closed-loop controlled VSC is the core entity that enables the SST to work as both inverter and rectifier. Different from other converters that interface renewable energy source to microgrids, the SST can connect both dc load and energy sources. Based...
Offshore wind farm with an internal medium voltage DC (MVDC)-grid collection connected to high voltage direction current (HVDC) transmission is a promising option for the development of high power long distance offshore wind farms. Medium voltage high power DC/DC converters with high step-up conversion ration are the key components in these electrical systems. This paper presents a high efficiency...
This paper presents a new voltage-balancing controller for cascaded multilevel converters, especially for single-phase cascaded multilevel converters. It proposes a control algorithm that devotes itself not only to balancing the floating dc capacitors but also to eliminating the coupling effect between the voltage-balancing controller and the original system controller (controller without additional...
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