Control of a Multilevel Converter for Power Quality Improvement in Wind Power Plants
Authors
Cantarellas, Antoni Mir ; Sintamarean, Nicolae-Cristian
Term
4. term
Education
Publication year
2012
Submitted on
2012-05-31
Pages
113
Abstract
Når mere vindkraft kobles på elnettet, kan vindens udsving og systemets stigende kompleksitet give problemer med stabilitet og spændingskvalitet. Derfor kræver netkoder, at vindmølleparker støtter nettet ved at holde spændingen stabil og begrænse elektrisk forvrængning. Dette arbejde udvikler en avanceret styringsstrategi til en tre-niveaus effektomformer, så den kan fungere både som STATCOM (en enhed der hurtigt leverer eller optager reaktiv effekt for at stabilisere spænding) og som et aktivt filter (som undertrykker uønskede harmoniske). Vi introducerer en Smart-STATCOM-styring, der automatisk koordinerer kompensering af reaktiv effekt og dæmpning af harmoniske spændinger samtidigt. Den bestemmer, hvor meget ikke-aktiv strøm der skal injiceres — ved grundfrekvensen samt 5. og 7. harmoniske — baseret på den målte spændingskvalitet i tilslutningspunktet mellem vindmølleparken og nettet (PCC). Eksperimentelle resultater analyseres for at validere ydeevnen af styringen og det samlede system.
As more wind power connects to the electricity grid, the variable nature of the wind and the growing complexity of the system can cause stability and power quality issues. Grid codes therefore require wind farms to help support voltage and limit electrical distortion. This study designs an advanced control strategy for a three-level power converter so it can act both as a STATCOM (a device that quickly supplies or absorbs reactive power to stabilize voltage) and as an active filter (which cancels unwanted harmonic distortion). We introduce a Smart-STATCOM control that automatically coordinates reactive power and harmonic voltage mitigation at the same time. It decides how much non-active current to inject—at the fundamental frequency and at the 5th and 7th harmonics—based on the measured voltage quality at the point where the wind farm connects to the grid (the point of common coupling, PCC). Experimental results are analyzed to validate the performance of the controller and the overall system.
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