Stabilization and Control of Grid Connected Converter for Offshore Wind Power Systems
Author
Mostrup, Christopher Gravers
Term
4. term
Education
Publication year
2018
Submitted on
2018-07-07
Abstract
Dette speciale undersøger effektregulering og stabilitet af netside-konvertere til havvindkraft. Med udgangspunkt i en baseline laboratorieopsætning styres en nettilsluttet spændingskilde-inverter med SVPWM og LCL-filter via en hurtig strømsløjfe. Studiet sammenligner proportional–integral (PI) og proportional–resonant (PR) strømregulatorer, vurderer harmonisk kompensation (baseline 5. og 7.; udvidet til 11. og 13.), og afprøver fuzzy logik til online justering af regulatorernes forstærkninger. Strategierne analyseres i simulationer og implementeres på dSPACE til eksperimentel verifikation. Centrale resultater viser, at PR-styring fjerner den faseforsinkelse, der ses i baseline, men – i modstrid med simulationerne – øger den totale harmoniske forvrængning (THD). Den mest effektive forbedring er øget harmonisk kompensation, og fuzzy logik reducerer THD yderligere, så den samlede forbedring bliver 1,17 procentpoint og den endelige THD 1,81 %. Arbejdet viser praktiske veje til bedre netkvalitet og stabilitet i nettilsluttede konvertere til integration af havvind.
This thesis investigates power control and stability of grid-side converters for offshore wind power systems. Using a baseline laboratory setup, a grid-connected voltage-source inverter with SVPWM and an LCL filter is controlled via a fast current loop. The study compares proportional–integral (PI) and proportional–resonant (PR) current controllers, evaluates harmonic compensation (baseline 5th and 7th; extended to 11th and 13th), and tests fuzzy logic controllers for online gain adjustment. Control strategies are analyzed in simulations and implemented on dSPACE for experimental verification. Key results show that PR control removes the phase lag observed in the baseline but, contrary to simulations, increases total harmonic distortion (THD). The most effective improvement is the added harmonic compensation, while fuzzy logic tuning further reduces THD, yielding an overall reduction of 1.17 percentage points and a final THD of 1.81%. The work demonstrates practical pathways to enhance power quality and stability in grid-connected converters for offshore wind integration.
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