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-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.
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.
[This abstract was generated with the help of AI]
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