Serial Connection of three phase converters
Author
Kalogiannis, Theodoros
Term
4. term
Education
Publication year
2015
Submitted on
2015-05-27
Pages
75
Abstract
Denne afhandling analyserer, simulerer og opbygger seriekoblede effektelektroniske konvertere. Kernen er en enkeltfase ækvivalent celle, der kombinerer en standard trefaset, to-niveaus spændingskilde-inverter med en bidirektionel fuldbro, forbundet via en højfrekvens-transformer. Konvertere ændrer elektrisk energi fra én form til en anden; inverteren laver jævnstrøm om til vekselstrøm, og den bidirektionelle fuldbro kan overføre effekt i begge retninger. For at muliggøre drift ved høj frekvens modificeres den sinusformede pulsbreddemodulation (PWM), der styrer switchene. Vi undersøger, simulerer og tester også flere kommuteringsmetoder (måder at tænde og slukke switchene sikkert på) for den bidirektionelle fuldbro. Til sidst dimensioneres transformeren med fokus på at minimere lækageinduktans (uønsket parasitisk induktans, der kan give tab og spændingsspidser), og tre prototyper bygges og sammenlignes.
This thesis analyzes, simulates, and builds series-connected power converters. The core is a single-phase equivalent cell that combines a standard three-phase, two-level voltage-source inverter with a bidirectional full-bridge converter, linked by a high-frequency transformer. Power converters change electrical energy from one form to another; the inverter turns DC into AC, while the bidirectional full bridge can transfer power in both directions. To enable high-frequency operation, we modify the sinusoidal pulse-width modulation (PWM) that drives the switches. We also study, simulate, and test several commutation methods (ways to turn switches on and off safely) for the bidirectional full bridge. Finally, we design the transformer to minimize leakage inductance (unwanted parasitic inductance that can cause losses and voltage spikes) and build and compare three prototypes.
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