44 lines
1.9 KiB
Markdown
Executable File
44 lines
1.9 KiB
Markdown
Executable File
---
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layout: page
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excerpt: "Research"
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menutitle: Research
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menuorder: 2
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---
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## Ongoing Research
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### Modular and Multilevel Converters
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Cascaded H-Bridge (CHB) multilevel inverters are popular because of
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their inherent modularity, scalability, and efficient voltage
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translation capability. Carrier-based modulation schemes such as
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Level-Shifted PWM (LSPWM) are simple and easy to implement but result in
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extreme disparity in processed power among the modules. This unequal
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loading and non-uniform semiconductor loss results in unequal thermal
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stress, accelerating premature failures in over-stressed modules.
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Space-vector and switching angle adjustment schemes can remedy this but
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can be computationally impractical for higher-order CHBs.
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Our work has led to the development of new, computationally efficient
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carrier-reassignment schemes for 9-level and 17-level
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CHB inverters to achieve near-perfect real and reactive power balance across
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modules over the entire power factor range. Further, semiconductor loss analysis
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shows that conduction and switching losses are also equalized
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across the topology. A simple combinational circuit is also developed to balance the zero-state conduction losses without introducing additional switching.
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A 9-level CHB Power stage is developed for hardware testing and detailed loss models are
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made in Real-time simulation using the state-of-the-art OpalRT HIL Platform.
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### Magnetics Design for Power Harvesting
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Patent Pending:<br>
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A power harvester for line-crawling robots for Live Powerline inspection
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[//]: # ### Power Converters for EV Chargers and ### Real-time Simulation and Hardware-in-Loop Testing
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