Abstract
A new highly compact topology for solid-state transformers is presented. It is based on modular multilevel converters and, therefore, has their usual advantages such as superior voltage shape, high reliability, and scalability. It utilises arm inductors for the isolated energy transfer between two converters and thereby allows for a more compact build compared to the design that uses separate transformers.
Highlights
The future of electrical distribution is widely seen to be based on microgrid structures [1]
This paper presents a new topology for solid-state transformers (SSTs) based on modular multilevel converters (MMCs)
The coupled inductors are chosen in such a way that only the internal currents of the MMCs result in a magnetic field in the core
Summary
The future of electrical distribution is widely seen to be based on microgrid structures [1]. Interconnecting the microgrids smart transformer technology is needed. This need is filled by solid-state transformers (SSTs). As such, it can actively control the power flow between its terminals. Reactive power can be provided independently to both sides This enables reliable decoupling of microgrids from each other. MMCs are a class of converter in which many identical cells (see Fig. 1) are connected in series to reach high voltages [2]. This leads to a voltage shape containing many levels and, little distortion. The cells can be fitted with bypass switches to increase the fault tolerance of the system
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