Design and Assembly of a Novel Topology Concept for Bidirectional Grid Connecting Inverters Employing 600V Four Quadrant GaN Semiconductors
Author
Ng, David Levi
Term
4. term
Education
Publication year
2024
Pages
69
Abstract
This thesis designs, builds, and brings into operation a prototype inverter that can both feed power to and draw power from the grid using a single conversion stage. The concept was originally proposed by Eckart Hoene within Fraunhofer IZM’s EnerConnect project. The thesis explains the basics of gallium nitride (GaN) power switches, the flying capacitor method for voltage balancing, and the key operating ideas of the new circuit topology. To speed implementation, a simplified topology is constructed: bidirectional devices are realized as two back-to-back GaN switches, the flying capacitor is omitted, and only GaN high-electron-mobility transistors (HEMTs) are used, without additional MOSFETs. The static control approach and the basic operation of this simplified circuit are then validated in DC-DC laboratory experiments.
Dette speciale designer, bygger og idriftsætter en prototypeinverter, der med én konverteringsfase både kan levere strøm til elnettet og optage strøm fra det. Konceptet blev oprindeligt foreslået af Eckart Hoene i forbindelse med Fraunhofer IZM’s EnerConnect-projekt. Specialet forklarer grundprincipperne for galliumnitrid (GaN) effektswitche, flyvende kondensator-princippet til spændingsbalancering samt de vigtigste funktionsideer i den nye kredsløbstopologi. For at lette implementeringen konstrueres en forenklet topologi: tovejsenheder realiseres som to GaN-switche koblet ryg mod ryg (back-to-back), den flyvende kondensator udelades, og der anvendes kun GaN HEMT-transistorer (højelektronmobilitet) uden ekstra MOSFET’er. Den statiske styringsmetode og den grundlæggende funktion af det forenklede kredsløb verificeres derefter i DC-DC laboratorieforsøg.
[This apstract has been rewritten with the help of AI based on the project's original abstract]
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