MW-Level Power Converter Solutions for Power-to-X Application
Authors
Lazaris, Spyridon ; Wani, Ubaid Bashir ; Damkjær, Jakob
Term
4. semester
Education
Publication year
2022
Submitted on
2022-05-29
Abstract
Dette speciale undersøger MW-niveau konverterløsninger til Power-to-X (P2X) i lyset af stigende vedvarende energiproduktion og overskudsenergi i lavlastperioder, hvor højstrøms ensrettere omdanner net-AC til den DC, der kræves af processer som elektrolyse. Hovedspørgsmålet er, hvilke ensrettertopologier der bedst opfylder industrielle P2X-krav med hensyn til netkvalitet, virkningsgrad, omkostninger og pålidelighed. Arbejdet designer, modellerer og analyserer fire state-of-the-art løsninger—12-puls tyristorensretter, 12-puls diodeensretter med multiphase-chopper, 12-puls tyristorensretter med aktivt shunt-effektfilter samt en aktiv front-end (B6+chopper)—og præsenterer en ny modulær multicelle-ensretter. Ved hjælp af simuleringer vurderes topologierne under ideelle forhold og stressscenarier, herunder harmonisk forvrængning, ubalancerede net og lastvariationer; centrale indikatorer omfatter harmonisk ydeevne og effektfaktor, virkningsgrad, fysisk fodaftryk, kompleksitet og pålidelighed. Specialet adresserer også harmoniskdæmpning (trap-filtre og resonansregulatorer) samt komponenttab i tyristorer, dioder, IGBT’er, MOSFET’er og transformere. Arbejdet munder ud i en sammenlignende vurdering, der kan pege på lovende kandidater til industriel implementering; specifikke kvantitative rangeringer fremgår ikke af det tilgængelige uddrag.
This thesis investigates MW-level converter solutions for Power-to-X (P2X) in response to growing renewable integration and off-peak energy surplus, focusing on high-current rectifiers that convert grid AC to the DC required by processes such as electrolysis. The central question is which rectifier topologies best meet industrial P2X requirements in terms of power quality, efficiency, cost, and reliability. The work designs, models, and analyzes four state-of-the-art options—a 12-pulse thyristor rectifier, a 12-pulse diode rectifier with multi-phase chopper, a 12-pulse thyristor rectifier with an active shunt power filter, and an active front end (B6+chopper)—and introduces a novel modular multicell rectifier. Using simulation studies, the topologies are evaluated under ideal conditions and stress cases, including harmonic distortion, unbalanced grids, and load variations; key indicators include harmonic performance and power factor, efficiency, physical footprint, complexity, and reliability. The thesis also addresses harmonic mitigation (trap filters and resonant controllers) and component-level losses in thyristors, diodes, IGBTs, MOSFETs, and transformers. The work culminates in a comparative assessment to highlight promising candidates for industrial deployment; specific quantitative rankings are not reported in the provided excerpt.
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