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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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A Test Bed for Evaluating Frequency Estimation Algorithms in Synthetic Inertia Control: User Manual
As penetration of converter interfaced generators (CIGs) increases, the need for CIG frequency control participation increases. Traditionally, research in this area has been performed using positive sequence simulation software, which provides voltage magnitude and phase measurements, but not point-on-wave (POW) measurements. This means that the effect of frequency estimation algorithms cannot be accurately modeled, especially when the voltage waveform is distorted by faults or load connection events. This report serves as a user manual for an electromagnetic transient simulation testbed, which allows for accurate modeling of frequency estimation and control techniques.
Evaluation of Probing Signals for Implementing Moving Horizon Inertia Estimation in Microgrids.
Abstract not provided.
Optimization-Based Fast-Frequency Estimation and Control of Low-Inertia Microgrids .
Abstract not provided.
Input Signal for Synthetic Inertia: Estimated ROCOF Versus Remote Machine Acceleration.
Abstract not provided.
Defining a Platform Approach and Market Participation: Data Driven Business Models for Solid State Transformer-Based Synthetic Inertia and Voltage Stability Controls (CRADA Final Report, Project 1, Mod 1)
The primary objective of this project is to determine the incremental value created with the medium voltage solid-state transformer (MV SST) technology to different stakeholders in view of the updated DER grid regulations. This includes studying the benefits of the MV SST technology in a range of use cases for EV and DER penetration including (1) “corridor charging” for EVs and (2) solar plus storage (FERC 2222). The potential customers of this technology include utilities for EV charging, DER installers who must meet utility interconnection requirements, balancing authorities, and DER aggregators. The traditional transformers on the grid could be a limiting factor for the EV-grid integration as the distribution transformers were not designed to handle the dynamic and fluctuating EV charging loads. Thus, the issues such as voltage fluctuations, increased losses and reduced efficiency [1] can negatively impact the grid operation. To address these challenges, transformers with flexibility and adaptability become imperative to meet the evolving energy demands. In this regard, the concept of Medium Voltage Solid-State Transformers.
Grid-Forming Frequency Shaping Control for Low-Inertia Power Systems
As power systems transit to a state of high renewable penetration, little or no presence of synchronous generators makes the prerequisite of well-regulated frequency for grid-following inverters unrealistic. Thus, there is a trend to resort to grid-forming inverters which set frequency directly. We propose a novel grid-forming frequency shaping control that is able to shape the aggregate system frequency dynamics into a first-order one with the desired steady-state frequency deviation and Rate of Change of Frequency (RoCoF) after a sudden power imbalance. The no overshoot property resulting from the first-order dynamics allows the system frequency to monotonically move towards its new steady-state without experiencing frequency Nadir, which largely improves frequency security. We prove that our grid-forming frequency-shaping control renders the system internally stable under mild assumptions. The performance of the proposed control is verified via numerical simulations on a modified Icelandic Power Network test case.
Assessing Lava Flow Subpixel Surface Roughness and Particle Size Distribution for Improved Thermal Inertia Interpretations
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Evaluation of Recent Measurements of Mercury’s Moments of Inertia and Tides Using a Comprehensive Markov Chain Monte Carlo Method
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Derivation and general calculation of conservative torques exerted at the paddle-arm axis of a laboratory model satellite and the determination of the moment of inertia about the paddle-arm axis of a rectangular solar paddle with variable pitch
Design data for construction of electromechanical system with two degrees of freedom for solar paddle orientation
Instrument calculates moments of inertia of complex plane figures
Instrument consisting of a narrow field scanner coupled with a simple preprogrammed computer calculates distributive-area properties of complex or irregular plane figures representing cross sections of structural members. The calculator obtains the properties quickly and with a high degree of accuracy.
Convective inertia and gas ingestion effects on flow regimes of the viscoseal - Theory and experiment.
Viscoseal operation in superlaminar flow regime noting pressure patterns, end effect, gas ingestion and sealing capacity
The effects of geometry and inertia on face seal performance - Laminar flow.
Inertial and geometric effects on face seal performance for laminar flow range
The effects of geometry and inertia on face seal performance.
Inertial and geometric effects on face seal performance for turbulent flow at high rotational Reynolds numbers
Convective inertia and gas ingestion effects on flow regimes of the viscoseal theory and experiment.
Viscoseal operation in superlaminar flow regime noting pressure patterns, end effect, gas ingestion and sealing capacity
A study of convective inertia effects and methods of controlling gas ingestion in large diameter viscoseals
Gas ingestion control, and characteristic length and aspect ratio effects on viscoseals