Design of MMC sub-module for high power testing applications
Authors
Garnelo Rodriguez, Miguel ; Andersen, Daniel Bo Rønnest
Term
4. term
Education
Publication year
2021
Submitted on
2021-05-27
Pages
116
Abstract
Behovet for høj-effekt test, f.eks. at efterligne elnettet i et laboratorium (netemulering), er vokset. En lovende løsning er en modulær multilevel-konverter (MMC), som består af mange delmoduler, der sammen kan skabe netlignende spændinger. Denne afhandling udvikler og afprøver et enkelt MMC-delmodul (SM) til sådanne høj-effekt testanlæg. Arbejdet følger en trinvis udviklingsmetode og inkluderer Design Failure Mode and Effect Analysis (DFMEA) – en systematisk måde at forudse mulige fejl og deres konsekvenser – som en del af processen. Delmodulets hovedundersystemer identificeres, med fokus på effekt-hardware (energilagring og kobling) og styringshardware (måling og kontrol). Der udarbejdes en klar testplan, der dækker både idriftsættelse og designvalidering. De eksperimentelle resultater ligger inden for de krav, der er sat til en MMC til høj-effekt test. Designet vurderes desuden med en Technology Readiness Level (TRL) analyse, som måler teknologimodenhed. Samlet set viser delmodulet lovende egenskaber for senere integration i en fuld MMC, og de få identificerede fejltilstande er opdaget og afhjulpet.
The demand for high-power testing, such as emulating the electrical grid in a lab, is growing. A promising approach is a Modular Multilevel Converter (MMC), which is built from many submodules that together produce grid-like voltages. This thesis develops and tests a single MMC submodule (SM) for such high-power test systems. The work follows a step-by-step development method and includes Design Failure Mode and Effect Analysis (DFMEA)—a structured way to anticipate possible failures and their effects—as part of the process. The submodule’s main subsystems are defined, focusing on power hardware (energy storage and switching) and control hardware (measurement and control electronics. A clear test plan is created, covering both commissioning and design validation. The experimental results meet the requirements set for an MMC used in high-power testing. The design is also assessed with a Technology Readiness Level (TRL) analysis, which gauges technological maturity. Overall, the submodule shows promising performance for future integration into a full MMC, with a few failure modes identified and mitigated.
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