Mission Profile Based Lifetime Evaluation of Grid-Connected PV Inverter
Author
Kjær, Martin Vang
Term
4. term
Education
Publication year
2020
Pages
108
Abstract
Renewable generation has expanded rapidly, with photovoltaics (PV) the most widely installed technology, yet PV inverters exhibit comparatively high failure rates. This thesis performs a mission profile based lifetime evaluation of a grid-connected PV inverter to identify reliability-critical components and support design for reliability. State-of-the-art reliability models are applied at component level to translate real-field mission profiles into stress and wear-out assessments for long-term operation. The analysis explicitly addresses uncertainty by incorporating electrical parameter variations and the substantial variability of lifetime model parameters. Alternative subsystem configurations are examined to assess potential lifetime improvements. The work provides lifetime estimates and highlights system weak points to guide more reliable inverter design; specific quantitative findings are not included in this excerpt.
Vedvarende elproduktion er vokset markant, og solceller (PV) er den mest udbredte teknologi, men PV-invertere har relativt høje fejlrater. Dette speciale gennemfører en missionsprofil-baseret levetidsevaluering af en nettilsluttet PV-inverter med henblik på at identificere pålidelighedskritiske komponenter og understøtte design for pålidelighed. Avancerede pålidelighedsmodeller anvendes på komponentniveau til at oversætte missionsprofiler fra virkelige driftsforhold til belastnings- og udslidningsanalyser for langtidsholdbarhed. Analysen behandler usikkerhed eksplicit ved at inkludere variationer i elektriske parametre samt den markante variation i levetidsmodellernes parametre. Alternative delsystemkonfigurationer analyseres for at vurdere mulige forbedringer af levetiden. Arbejdet leverer levetidsestimater og peger på systemets svage led som grundlag for mere pålideligt inverterdesign; konkrete kvantitative resultater fremgår ikke af dette uddrag.
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