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Friday, July 24, 2020 | History

3 edition of Wavelet-based grid generation found in the catalog.

Wavelet-based grid generation

Wavelet-based grid generation

  • 178 Want to read
  • 9 Currently reading

Published by National Aeronautics and Space Administration, Langley Research Center, National Technical Information Service, distributor in Hampton, Va, [Springfield, Va .
Written in English

    Subjects:
  • Wavelet analysis.,
  • Grid generation (Mathematics),
  • High pass filters.,
  • Computational grids.

  • Edition Notes

    Other titlesWavelet based grid generation.
    StatementLeland Jameson.
    SeriesICASE report -- no. 96-59., NASA contractor report -- 201609., NASA contractor report -- NASA CR-201609.
    ContributionsLangley Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL18115670M

    Distributed Power Generation Systems (DPGS) based on inverters require reliable islanding detection algorithms (passive or active) in order to determine the electrical grid status and operate the grid connected inverter properly. These methods are based on the analysis of the DPGS voltage, current and power in time or frequency by: Downloadable! An intelligent control of photovoltaics is necessary to ensure fast response and high efficiency under different weather conditions. This is often arduous to accomplish using traditional linear controllers, as photovoltaic systems are nonlinear and contain several uncertainties. Based on the analysis of the existing literature of Maximum Power Point Tracking (MPPT) techniques, a Cited by:

      Introduction A random walk is a mathematical object, known as a stochastic or random process, that describes a path that consists of a succession of random steps on some mathematical space such as the integers. An elementary example of a random walk is the random walk on the integer number line, which starts at 0 and at each step moves +1 or -1 with equal probability/5. Wavelet Based Steganography. Wavelet-based steganography is a new idea in the application of wavelets. However, the standard technique of storing in the least significant bits (LSB) of a pixel still applies. The only difference is that the information is stored in the wavelet coefficients of an image, instead of changing bits of the actual pixels.

    Skip to main content. The present book: Discrete Wavelet Transforms: Theory and Applications describes the latest progress in DWT analysis in non-stationary signal processing, multi-scale image enhancement as well as in biomedical and industrial applications. Each book chapter is a separate entity providing examples both the theory and by:


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Wavelet-based grid generation Download PDF EPUB FB2

COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.

Wavelet based islanding detection is a passive islanding detection technique as it doesnt inject by external disturbance signal to observe the change in grid parameters []. The time frequency. Wavelet Adaptivity for 3-D Device Simulation. In contrast to elliptic grid generation, which produces structured grids, the method used generates triangular or tetrahedral (unstructured.

A wavelet is a wave-like oscillation with an amplitude that begins at zero, increases, and then decreases back to zero. It can typically be visualized as a "brief oscillation" like one recorded by a seismograph or heart lly, wavelets are intentionally crafted to have specific properties that make them useful for signal convolution, wavelets can be combined with.

In the comparative study of two wavelet-based methods, i.e. WGM and WCM, Vasilyev and Palolucci indicated that their primary difference is that WGMs solve problems in wavelet coefficient space, while WCMs solve problems in physical space on a dynamically adaptive computational WCMs, every wavelet is associated with a collocation point, and thus grid adaptation is simply based on the Cited by: Modified wavelet called wavelet packet transform (WPT) based approach is proposed in this paper for the detection of different disturbances occurring due to faults in grid-connected solar photovoltaic (SPV) power system.

The detection performance of WPT is compared with that of wavelet transform under different operating by: 6. A wavelet based sparse grid method for the electronic Schrödinger equation with the coefficients ul,j:= R ϕ l,j (x)u(x)dx. In the following we focus on the Meyer wavelet family for the choice of φ andwith the definition of the Fourier transform F [f](ω) = f(ω)ˆ =√1.

() Wavelet-based adaptive mesh generation for device simulation. Solid-State Electronics() A multilevel adaptive solver based on second-generation wavelet thresholding by: Thus the fault detection and classification during power swing is a very important issue.

To solve this problem, many schemes have been proposed [12] – [14]. None of them can provide the function of fault detection and fault classification during power swings. Wavelets are one of the newly developed mathematical tools for signal processing [15].

In the present work, the Solar Wind Speed (SWS) time series has been considered for study. Here, the intention of the authors is to investigate the presence of multifractality within the signal.

Continuous wavelet transforms modulus maxima method has been employed in this : Tushnik Sarkar, Mofazzal H. Khondekar, Subrata Banerjee. This paper deals about wavelet-based protection scheme for SVC compensated multi-terminal transmission system in presence of hybrid generation.

Fault indices are determined by detailed coefficients of current signals at all three terminals using Bior mother : Y. Manju Sree, G. Ravi Kumar, R. Kameswara Rao. Wavelet based Power Quality Monitoring in Grid Connected Wind Energy Conversion System Bhavna Jain Research Scholar Electrical Engineering Dept.

MANIT, Bhopal, India Shailendra Jain fictitious grid, where wind turbine switching action is the only source of voltage Size: KB. for wavelet based adaptive grid generation. Numerical tests in Sect. 7 show the performance of the method. The multi-rate circuit simulation problem We consider circuit equations in the charge/flux ori-arXivv1 [] 25 Apr Cited by: Wavelet compression.

Wavelet compression is a form of data compression well suited for image compression (sometimes also video compression and audio compression).Notable implementations are JPEGDjVu and ECW for still images, CineForm, and the BBC's goal is to store image data in as little space as possible in a t compression can be either lossless or lossy.

A method is presented for adaptively solving hyperbolic PDEs. The method is based on an interpolating wavelet transform using polynomial interpolation on dyadic grids.

The adaptability is performed automatically by thresholding the wavelet coefficients. Operations such as differentiation and multiplication are fast and simple due to the one-to-one correspondence between point values and Cited by: Wavelet-based Islanding Detection in Grid-Connected PV Systems A.

Pigazo, Member, IEEE, M. Liserre, Senior Member, IEEE, R. Mastromauro, Student Member, IEEE, V. Moreno, Member, IEEE and A. Dell’Aquila, Member, IEEE Abstract—Distributed Power Generation Systems (DPGS) based on inverters require reliable islanding detection algorithms.

Wavelet Based Multi-Terminal Transmission Line Protection with MicroGrid S CHANDRA SHEKAR1*, 3G RAVI KUMAR2, SVNL LALITHA 1Research Scholor, K L University & sor, Dept.

of EEE, Anurag Engg. College, Kodad, Telangana, India, [email protected] The integration of renewable power sources with power grids presents many challenges, such as synchronization with the grid, power quality problems and so on.

The shunt active power filter (SAPF) can be a solution to address the issue while suppressing the grid-end current harmonics and distortions. Nonetheless, available SAPFs work somewhat unpredictably in by: 2.

Lave et al. A Wavelet-based Variability Model (WVM) for Solar PV Powerplants 2 The WVM is designed to provide simulated power plant output to grid integration studies which test the effects of adding PV to existing electric feeders.

These studies are done historically, after. Rapid automatic detection of the fiducial points—namely, the P wave, QRS complex, and T wave—is necessary for early detection of cardiovascular diseases (CVDs).

In this paper, we present an R peak detection method using the wavelet transform (WT) and a modified Shannon energy envelope (SEE) for rapid ECG analysis. The proposed WTSEE algorithm performs a wavelet transform to reduce the size Cited by:.

Figure 10 compares the rising time of the injected PV power to the grid lines when the wavelet-based and the conventional low-pass filter are employed. The proposed wavelet-based low-pass filter with a less transient response time accurately extracts the positive sequence component of Author: Bijan Rahmani, Weixing Li.The increased penetration of distributed generation (DG) often connected to grid through dc-ac interface has made islanding detection an important and challenging issue to power engineers.

Several methods based on passive and active detection scheme have been proposed in the literature. While passive schemes have a large non detection zone (NDZ), concern has been raised on active method due to.order differencing with a wavelet-based grid and order selection mechanism.

Here very high order differencing will be schemes of order greater than or equal to 8, i.e., perh 20, or maybe order Such high orders of accuracy can produce solutions which are very close to .