Abstract
Solid-State Transformer (SST), a power electronics based transformer is an emerging technology in electric power system. The transformer is being investigated to completely replace existing Line/Low Frequency Transformer (LFT). SST is composed of either of the two topologies: AC-DC-AC, two steps approach; or AC-AC, single-step approach. The two steps approach consists of three stages: AC-DC; DC-DC; and DC-AC stages. The DC-DC stage is made up of a boost DC-DC converter, a DC-AC inverter and a High Frequency Transformer, HFT. Therefore, SST performs the tasks of LFT by means of power electronic converters and HFT. The main essence of SST is to provide solution to the problem of bulkiness and heaviness of the LFT in the power distribution network. This is with the view to providing reduction in construction cost, cost of maintenance and transportation. The power electronics transformer provides numerous advantages which are grouped into: The transformer has high power density; it functions in blackouts and brownouts; and it provides easy means of distributed renewable energy integration into associated grid. Therefore, this paper provides a glance into the technology of the SST for its better understating and promotion of research activities in the area.
Highlights
Power Electronics (PE) is one of the most emerging areas of Electrical Engineering [1]. e technology is a branch of engineering that combines elds of electrical power, electronics and control [1]
The Line Frequency Transformer (LFT) is associated with bulky size and heavy weight. ese disadvantages, coupled with the fact that the emerging grid in electric power system requires new functionalities, controllability and exibility from the distribution make the LFT undesirable [8]. ese and many more constraints of LFT permit researchers to conclude that the conventional transformer cannot effectively meet up with challenges of modern grid [4]
E SST circuit is composed of two or more static converters isolated by a transformer that operates at frequency considerably higher than the conventional 50/60Hz
Summary
Power Electronics (PE) is one of the most emerging areas of Electrical Engineering [1]. e technology is a branch of engineering that combines elds of electrical power, electronics and control [1]. E technology is a branch of engineering that combines elds of electrical power, electronics and control [1]. E In other words, the technology is concerns with application of solid-state electronics to the control and conversion of electric power. Low/Line Frequency Transformer (LFT) otherwise known as conventional transformer had been in use since 1880s. Ese disadvantages, coupled with the fact that the emerging grid in electric power system requires new functionalities, controllability and exibility from the distribution make the LFT undesirable [8]. Ese and many more constraints of LFT permit researchers to conclude that the conventional transformer cannot effectively meet up with challenges of modern grid [4]. E SST has relatively reduced size and weight due to use of High Frequency Transformer (HFT) in its design.
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