Impact of Distributed Generation on Distributed System
Author
Fernández Sarabia, Angel
Term
4. term
Education
Publication year
2011
Submitted on
2011-05-27
Pages
107
Abstract
Efterhånden som elforbruget stiger, kobles stadig mere decentral elproduktion (DG) til lokale fordelingsnet, fx vindmøller og gasturbiner. Når DG integreres, ændres nettes adfærd under fejl. Kortslutningsniveauet (tilgængelig fejlstrøm) varierer med netkonfigurationen og afhænger af, hvilke generatorer der er i drift. Hvis nogle generatorer kobles fra, kan fejlstrømmen falde, hvilket kan forlænge fejlrydningstiden og medføre uønskede udkoblinger eller utilsigtet aktivering af beskyttelsesudstyr. I dette speciale analyseres, hvordan DG‑penetration påvirker kortslutningsniveauet og koordineringen af beskyttelse i et fordelingsnet med vindmølle- og gasturbinegeneratorer. Der undersøges flere scenarier, hvor placering og teknologi for DG‑kilder varieres for at vurdere, hvordan disse forhold påvirker koordineringen af retningsbestemte overstrømsrelæer.
As electricity demand grows, more distributed generation (DG)—such as wind and gas turbine units—is connected to local distribution networks. Integrating DG changes how the network behaves during faults. The short-circuit level (the available fault current) varies with network configuration and with which generators are in service. If some generators disconnect, fault current can decrease, which may slow fault clearing and lead to unwanted trips or equipment disconnections. This thesis analyzes how DG penetration affects short-circuit levels and protection coordination in a distribution system with wind turbine and gas turbine generators. Multiple cases are studied, varying the location and technology of DG sources to assess how these factors influence the coordination of directional over-current relays.
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