Abstract
As the types of loads have been diversified and demand has increased, conventional distribution transformers are difficult to maintain the constant voltage against voltage drop along with distance, grid voltage swell/sag, and various loads. Also, it is hard to control the power flow when connecting renewable energy sources. Active hybrid solid state transformer (AHSST) is application to keep the voltage and power quality. AHSST is a system that combines conventional distribution transformer and converter. Accordingly, it can be applied directly to distribution infrastructure and it has both the advantages of solid state transformer (SST) and conventional transformer. AHSST is capable of active voltage and current control and power factor control. It has a simpler structure than SST and it can perform the same performance with the lower rating converter. This paper presents two stage AHSST system based on multi-level converter. The converter is composed of the back-to-back converter using silicon carbide (SiC) metal-oxide semiconductor field effect transistor (MOSFET). Proposed system has a wider voltage and power flow control range, lower filter size, and simpler control sequence than existing AHSST systems. The performance of the proposed system was verified by prototype system experiments.
Highlights
As the micro grid is developed and the renewable energy source increases, it is difficult to maintain the stable power quality of the distribution grid
This paper presents two stage Active hybrid solid state transformer (AHSST) system based on multi-level converter
The converter is composed of the back-to-back converter using silicon carbide (SiC) metal-oxide semiconductor field effect transistor (MOSFET)
Summary
As the micro grid is developed and the renewable energy source increases, it is difficult to maintain the stable power quality of the distribution grid. It is impossible to cope with a voltage fluctuation, such as voltage sag or swell exceeding the tap winding ratio Both two tap voltage must be used to implement the boost and buck operation mode, which forces the use of high voltage rated power semiconductor switch. Topologies power stages employed three-level diode neutral clamping (NPC) topology, so the the AHSST of is connected to the secondary side windings, activepoint control of the secondary side voltage power semiconductor switches with a voltage rating that is twice as low as a two-level topology can be and current and power factor control are possible In this structure, since the converter takes the used.
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