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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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High-Reliability Ceramic Capacitors to Enable Extreme Power Density Improvements.
Abstract not provided.
Sandia Fusion Energy Sciences Programs Supporting Burning Plasma Science Discovery Plasma Science.
Abstract not provided.
Optimal Power Module Design for High Power Density Traction Drive System.
Abstract not provided.
Experimental Evaluation of Grid-Forming Inverters Under Unbalanced and Fault Conditions.
Abstract not provided.
Passive high-power-density grid interface device
A hybrid switched capacitor power converter for high-power applications is provided. The converter has a transistor-switched input-stage boost converter followed by a capacitor-and-diode ladder circuit. The converter is adapted to produce an output voltage of at least 5 kV at a power level of at least 0.5 kW. The ladder circuit includes one or more multi-stage rails.
Optimal Power Module Design for High Power Density Traction Drive System.
Abstract not provided.
Method to Interface Grid-Forming Inverters into Power Hardware in the Loop Setups.
Abstract not provided.
Method to Interface Grid-Forming Inverters into Power Hardware in the Loop Setups.
Abstract not provided.
MagSense Sensor for health asset monitoring and fault detection FY2020 Q3 Report.
Abstract not provided.
Grid Forming Inverters for Spinning Reserve in Hybrid Diesel Microgrids.
Abstract not provided.
8812 Renewable Distributed Systems Integration (RDSI): Research in Power Hardware-in-the-Loop Grid Forming Inverter Technology.
Abstract not provided.
Reliability Studies of Wide-Bandgap Power Semiconductor Devices Under Realistic Stress Conditions.
Abstract not provided.
Development of Mission Profiles for Humidity Models in the Reliability Testing of PV Inverters: Preprint
To understand the impacts of humidity on PV inverters, mission profiles were developed to accurately describe the different processes and rates based on the environmental factors of temperature, relative humidity, and irradiance. The operating environment of the device introduces stress factors dependent on component temperature, relative humidity, and component voltage. The development of profiles started from looking at historical climate conditions at Cocoa, Florida, a hot and humid location. The profile developed from field location was compared with existing humidity test profiles in industrial and military standards to determine acceleration factors. Prior to the evaluation of the mission profiles, critical components in the PV inverter were identified based on vendor discussions along with failure modes of interest. The profiles considered in this study was demonstrated using a 4-kVA string inverter. The measurements from the devices were substituted in device manufacturer specified equation to determine the severity of each test. The severity of each test was compared against the severity of the 24-hour result to determine the acceleration factor of each test. The acceleration factors were determined to be over a range of 1.2-6 for the existing humidity tests from standards, when compared against the mission profile developed from field data. This optimal humidity/thermal profile will be passed to the IEC standards development for inverter qualification testing.
Panel Discussion ? Ultra-Wide Bandgap Materials Devices and Systems.
Abstract not provided.
Inverters: A Pivotal Role in PV Generated Electricity
This presentation discusses the pivotal role inverters play in PV generated electricity. Topics include: the inverter as the center of the system--increasingly becoming the brain, with more features and capabilities (hybrid systems, safety, islanding, monitoring, etc.); increasing inverter-based generated electricity associated with many renewable energy sources; increased dependence for grid support and forming capability; communication within the grid and security increasingly required; increasing complexity leads to more chances to fail; as in most PV segments, there is cost reduction pressure, which makes it more challenging to keep the reliability high.