Abstract
With the global trend to produce clean electrical energy, the penetration of renewable energy sources in existing electricity infrastructure is expected to increase significantly within the next few years. The solid state transformer (SST) is expected to play an essential role in future smart grid topologies. Unlike traditional magnetic transformer, SST is flexible enough to be of modular construction, enabling bi-directional power flow and can be employed for AC and DC grids. Moreover, SSTs can control the voltage level and modulate both active and reactive power at the point of common coupling without the need to external flexible AC transmission system device as per the current practice in conventional electricity grids. The rapid advancement in power semiconductors switching speed and power handling capacity will soon allow for the commercialisation of grid-rated SSTs. This paper is aimed at introducing a state-of-the-art review for SST proposed topologies, controllers, and applications. Additionally, strengths, weaknesses, opportunities, and threats (SWOT) analysis along with a brief review of market drivers for prospective commercialisation are elaborated.
Highlights
Since the Kyoto agreement on global greenhouse-gas emissions was ratified by most nations, individual countries have pledged to reduce conventional fossil fuel-based generation and integrate more renewable energy sources within electricity grids
The most significant challenges to current power grid models are the emergence of renewable sources, distributed generation, distributed storage, and bi-directional power flow
solid state transformer (SST) will play a significant role in future grid topologies
Summary
Since the Kyoto agreement on global greenhouse-gas emissions was ratified by most nations, individual countries have pledged to reduce conventional fossil fuel-based generation and integrate more renewable energy sources within electricity grids. SSTs utilize a reduced-size high-frequency transformer to control the voltage level, and a range of switching devices to shape and control input and output power. By including high-frequency transformer the second resonant consisting of small in parallel to eachSoft switching device resonates stage andconverter using a cycloconverter for acapacitors direct AC–AC conversion. Resonant converter consisting small capacitors in parallel to each switching that resonates the control scheme does not accommodate the utilisation of zero the DC link as this arrangement is withsimple a series inductor to damp switching oscillations and achieve voltage switching. Power flow, galvanic control the voltage at is required to regulate the active power provide galvanic isolation, and control the voltage at the LV DC bus [33] During this stage, theflow, voltage is stepped up by a high-frequency transformer and the LV DC bus [33].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
