In the application of power inverters, power density has become a key design specification where it has stringent requirements on system size and weight. Achieving high power density need to combine lasted wide bandgap (WBG) device technology and high switching frequency to reduce passive filter size thus further shrink overall space. While still maintaining decent power conversion efficiency and low electromagnetic interference (EMI) with higher switching frequency, soft-switching needs to be implemented.
A novel auxiliary resonant snubber is introduced. The design and operation are carried out, in which this snubber circuitry enables main Gallium Nitride (GaN) switches operating under zero voltage switching (ZVS) condition, and auxiliary Silicon Carbide (SiC) diodes switching under zero current switching (ZCS) condition. Besides, the auxiliary snubber circuitry gating algorithm is also optimized which allows reduction of the switching and conduction loss in auxiliary GaN switches to obtain higher system efficiency and better thermal performance. Here, this novel auxiliary resonant snubber circuitry is applied to a traditional full bridge inverter with flexible modulation suitability. This proposed inverter can be applied to a wide range of potential applications, such as string solar inverter, renewable energy combined distributed generation, dc-ac part of bi-directional electrical vehicle (EV) on-board charger, and uninterruptible power supply (UPS), etc. / Master of Science / This thesis combined an innovated resonant snubber circuit to resonate with traditional robust inverter topology with latest semiconductor devices implemented to achieve a high efficiency, high performance, low profile inverter system.
During the design procedure, control algorithm had been optimized, novel semiconductor devices were utilized, and comprehensive operation analyses were delivered. Finally an efficient and robust system was constructed and achieved the design goals.
With the reduction of non-renewable energy consumptions, the research work of this thesis carried out a novel inverter topology which can become a prominent candidate for tremendous applications such as solar panel, electrical vehicle charging, and other renewable energy sources.
| Identifer | oai:union.ndltd.org:VTETD/oai:vtechworks.lib.vt.edu:10919/83238 |
| Date | 16 May 2018 |
| Creators | Wei, Yu |
| Contributors | Electrical Engineering, Lai, Jih-Sheng, Li, Qiang, De La Ree, Jaime |
| Publisher | Virginia Tech |
| Source Sets | Virginia Tech Theses and Dissertation |
| Detected Language | English |
| Type | Thesis |
| Format | ETD, application/pdf |
| Rights | In Copyright, http://rightsstatements.org/vocab/InC/1.0/ |
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