Controller Interaction Assessment between a Full-scale Converter Wind Turbine and a MMC-HVDC Transmission System
Authors
Buruchaga Laza, Saioa ; Malz, Elena Charlotte
Term
4. term
Education
Publication year
2015
Submitted on
2015-06-03
Abstract
At forbinde havvindmølleparker til elnettet kræver pålidelige langdistanceløsninger. Højspændings jævnstrøm (HVDC) er attraktivt, og HVDC baseret på spændingsstyrede konvertere (VSC) er i dag udbredt. Indførelsen af modulære multilevel‑konvertere (MMC) giver mere fleksibel styring, men også større kompleksitet. Nyere studier peger på, at en VSC kan interagere uhensigtsmæssigt med resten af systemet og dermed reducere den elektriske dæmpning, så svingninger dør langsommere ud. Denne afhandling bruger en indgangsadmittans‑matrix tilgang—en måde at beskrive, hvordan komponenter ”ser ud” elektrisk for hinanden—til at undersøge mulig regulatorinteraktion mellem vindparkens dele. Den analyserer, hvordan basisvalg af regulatorparametre påvirker delsystemernes passivitet (om de kun dissipere og ikke tilfører energi). Derudover anvendes net‑dæmpningskriteriet til at vurdere den samlede systemstabilitet.
Connecting offshore wind farms to the grid calls for reliable long‑distance links. High‑voltage direct current (HVDC) is an attractive option, and HVDC based on voltage‑source converters (VSCs) is widely used. The modular multilevel converter (MMC) brings added controllability but also more complexity. Recent studies indicate that a VSC can interact unfavorably with the rest of the system, reducing electrical damping so oscillations decay more slowly. This thesis applies an input admittance matrix approach—a way to describe how components electrically “look” to each other—to examine potential controller interaction among wind‑farm components. It evaluates how basic controller parameter choices affect the passivity of subsystems (whether they dissipate rather than inject energy), and uses the net‑damping criterion to assess overall system stability.
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