Application Study for a Modern Circuit Breaker: Current Protection
Translated title
Application Study for a Modern Circuit Breaker
Author
Cheema, Waqas Aslam
Term
4. semester
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 udfordrende at beskytte DC-kredsløb mod fejlstrømme, fordi DC – i modsætning til vekselstrøm – ikke passerer naturligt gennem nul og derfor er sværere at afbryde. Mange eksisterende solid state-topologier har høje ledetab, altså energi, der bliver til varme, når afbryderen leder. Dette speciale konstruerer og tester en solid state-afbryder, der markant reducerer disse tab sammenlignet med en IGBT-baseret afbryder i samme effektniveau. Den foreslåede topologi kombinerer forskellige halvlederkomponenter for at udnytte deres styrker og holde tabene lave. Det øger styringskompleksiteten, og derfor præsenteres en enkel styringsstrategi til at betjene afbryderen.
DC microgrids are increasingly used to distribute energy more efficiently. However, protecting DC circuits from fault currents is challenging because, unlike alternating current, DC does not naturally cross zero, making interruption harder. Many existing solid-state breaker topologies have high on-state losses—energy wasted as heat while the breaker conducts. This thesis builds and experimentally tests a solid-state circuit breaker that significantly reduces these losses compared with an IGBT-based breaker in the same power range. The proposed topology combines different semiconductor devices to leverage their strengths while keeping losses low. This increases control complexity, so a simple control strategy is introduced to operate the breaker effectively.
[This abstract was generated with the help of AI]
Documents