Entirely Transformerless Universal Direct-Injection Power-Flow Controller
Davood Keshavarzi, Alexander Koehler, Wolfram H. Wellssow, Stefan M. Goetz

TL;DR
This paper introduces a compact, transformerless power-flow controller for low-voltage power grids that uses silicon and silicon-carbide semiconductors, reducing size and cost while improving power management.
Contribution
It presents a novel full-power-flow control circuit without transformers, combining silicon and silicon-carbide semiconductors for high-current direct injection.
Findings
The circuit operates effectively in simulation and experiments.
It requires fewer semiconductors than previous solutions.
The design is compact and cost-effective.
Abstract
An increasing penetration of renewable energy resources, electric vehicle chargers, and energy storage systems into low-voltage power grids causes several power management and stability problems, such as reverse power flow, (local) overload lines, and over- / under-voltage. Previous power-flow and soft-open-point solutions are bulky and expensive. They need transformers and large magnetics, some on grid frequency, others more compact at high frequency. Even suggested circuits with high-frequency transformers still struggle with cost and size. We present a compact partial power-conversion high-current full-power-flow control circuit without a single transformer. We combine silicon and silicon-carbide, each with their specific advantages for current-dense direct injection. The circuit further needs fewer semiconductors than previous concepts. The circuit links a shunt converter through a…
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Taxonomy
TopicsAdvanced DC-DC Converters · Microgrid Control and Optimization · Multilevel Inverters and Converters
