Application Study for a Modern Circuit Breaker
Author
Aragon Caminero, Victor
Term
4. term
Education
Publication year
2019
Submitted on
2019-05-31
Pages
121
Abstract
DC microgrids are increasingly used to distribute energy more efficiently. However, protecting DC circuits from fault currents is challenging because DC lacks natural zero-current crossings, unlike AC, which makes it harder to interrupt current quickly and safely. Solid-state circuit breakers (using power electronics instead of mechanical parts) can switch fast, but many existing designs have high on-state (conduction) losses—energy wasted while the breaker is on. This thesis builds and experimentally validates a modern solid-state DC circuit breaker designed to significantly reduce these losses compared with an IGBT-based breaker in a similar power range. The topology combines the strengths of different semiconductor devices, which increases control complexity; to keep operation practical, a simple control strategy is proposed.
DC-mikronet bruges i stigende grad til at fordele energi mere effektivt. Men det er sværere at beskytte jævnstrømskredsløb mod fejlstrømme, fordi DC ikke har naturlige nulgennemgange som AC; derfor er det vanskeligere hurtigt og sikkert at afbryde strømmen. Elektroniske (solid-state) afbrydere uden bevægelige dele kan koble hurtigt, men mange eksisterende løsninger har høje ledningstab—energi, der går tabt, mens afbryderen leder strøm. Denne afhandling konstruerer og afprøver eksperimentelt en moderne DC-afbryder, der er designet til markant lavere tab end en IGBT-baseret afbryder i samme effektniveau. Kredsløbsopbygningen forener styrkerne ved forskellige halvlederkomponenter, hvilket øger kontrolkompleksiteten; for at holde betjeningen praktisk foreslås derfor en enkel kontrolstrategi.
[This apstract has been rewritten with the help of AI based on the project's original abstract]
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