Wind Power Plant Control Optimisation with Embedded Application of Wind Turbines and STATCOMs
Authors
Kryezi, Fitim ; Petersen, Lennart
Term
4. term
Education
Publication year
2015
Submitted on
2015-06-03
Pages
117
Abstract
Efterhånden som større vindkraftværker erstatter konventionelle kraftværker, får de et større ansvar for at holde spændingsniveauerne i elnettet stabile. Dette speciale udvikler en model af et vindkraftværk til styringsanalyse og beskriver design og indstilling af en bestemt spændingsstyringsarkitektur. Et eksempel fra Storbritannien med tilhørende netkrav (grid codes) danner reference. Først gennemgås flere mulige strategier for spændingsstyring med deres fordele og ulemper. Derefter udvikles småsignalmodeller (for små afvigelser) af både en enkelt vindmølle og hele vindkraftværket for at vurdere spændingskontrollen. Møllemodellen kontrolleres med egenværdianalyse og sammenlignes med numeriske EMT-simuleringer (detaljerede simuleringer af hurtige elektromagnetiske forløb). Vindkraftværksmodellen valideres med belastningsstrømsimuleringer (load flow). Til sidst munder design og indstilling af spændingsregulatoren ud i en vejledning for den valgte arkitektur. Den giver kvalitative vurderinger af, hvordan systemforsinkelser, netforhold og forskellige driftsforhold påvirker ydeevnen – både med og uden STATCOM-enheder (udstyr, der støtter spændingen).
As larger wind farms replace conventional power stations, they are increasingly expected to help keep grid voltage levels stable. This thesis develops a wind power plant model for control studies and sets out the design and tuning of a specific voltage-control architecture. A UK wind farm and its grid code requirements serve as the reference case. First, several voltage-control strategies are reviewed with their advantages and disadvantages. Next, small-signal models of a single wind turbine and of the entire plant are built to assess voltage control. The turbine model is checked using eigenvalue analysis and compared against numerical EMT simulations (detailed simulations of fast electromagnetic transients). The wind power plant model is validated with load-flow simulations. Finally, the controller design and tuning lead to guidance for the chosen architecture, providing qualitative insights into how system delays, grid conditions, and different operating points affect performance, with and without STATCOMs (devices that support voltage).
[This abstract was generated with the help of AI]
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