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  • A comparison and assessment of hybrid filter topologies and control algorithms

    Creator:
    Chen, Lijun
    Abstract:
    The harmonic problem in power systems is gaining more attention as incidences correlated with harmonics increase. Conventional passive filtering techniques for harmonic mitigation have inherent problems, and purely active filters have the disadvantages of higher costs and ratings. Hybrid active filters inherit the efficiency of passive filters and the improved...
    Resource Type:
    Masters Thesis
    Full Text:
    A comparison and assessment of hybrid filter topologies and

  • Tone burst deconvolution

    Creator:
    Rathja, Roy C.
    Abstract:
    The suitability of discrete least-squares optimal (Wiener) filters for deconvolution of tone-burst waveforms is studied. It is shown that: (1) such waveforms are not well suited to these filters without preprocessing, (2) the use of exponential weighting results in a significant improvement in filter performance and (3) that "phase-unwrapping" in...
    Resource Type:
    Dissertation
    Full Text:
    improvement ip filter performance and (3) that "phase-un- wrapping" in the z-plane results in a useful

  • Active power filter for the cancellation of harmonic line current distortion

    Creator:
    Merk, Marcel
    Abstract:
    With the increased attention on high efficiency and energy savings, power electronic energy conversion equipment is increasingly incorporated in all levels of the power system. The drawback of such equipment is the generation of nonsinusoidal currents in the power distribution network due to the nonlinear operation. Harmonic currents may distort...
    Resource Type:
    Masters Thesis
    Full Text:
    Active power filter for the cancellation of harmonic line

  • A DSP controlled resonant active filter for current harmonic mitigation in three-phase power systems

    Creator:
    Ünsal, Abdurrahman
    Abstract:
    Power quality has become an important concern to both electric utilities and end users due to the increased use of non-linear loads in modem power systems over the past decade. Nonlinear loads inject harmonics into the power system and thus may lead to poor power quality and lower power factor....
    Resource Type:
    Dissertation
    Full Text:
    . Title: A DSP Controlled Resonant Active Filter for Current Harmonic Mitigation in Three-Phase Power

  • Digitally-programmable switched-current filters

    Creator:
    Yesilyurt, Ayse Gul
    Abstract:
    Digitally-programmable filters have been an ongoing research topic for a number of years. The first such filters were FIR transversal filters using Charge-Coupled Devices (CCD's) and IIR recursive filters using switched-capacitor (SC) techniques. Although both techniques achieve excellent results, they require non-standard and/or additional IC fabrication steps. Low substrate doping...
    Resource Type:
    Masters Thesis
    Full Text:
    digitally programming a second-order SI filter section. While providing similar capabilities to the

  • Multi-variate morphological filtering with applications to color image processing

    Creator:
    Eo, Jin-woo
    Abstract:
    Mathematical morphology, developed in the early 1960's for single-component signals, has been applied to a number of image processing applications. This investigation examines the systematic extension of mathematical morphology to multi-variate signals. Two approaches are considered. The first approach, the extension of the theory of single-component morphological filters to multi-variate...
    Resource Type:
    Dissertation
    Full Text:
    mathematical morphology, including the following: (1) Morphological filters have the ability to filter out

  • Sensitivity analysis and architectural comparison of narrow-band sharp-transition digital filters

    Creator:
    Kulkarni, Satish S.
    Abstract:
    Due to advances in high-density low-cost VLSI and communication technology, digital filtering and signal processing are being widely used for real-time signal processing applications. Given the filter specification, choosing the best filter structure for a given application is not a trivial task. The choice of a particular filter structure depends...
    Resource Type:
    Masters Thesis
    Full Text:
    filter specification, choosing the best filter structure for a given application is not a trivial task

  • High speed digital FIR filter design

    Creator:
    Zhou, Bo
    Abstract:
    The objective of this thesis is to design a high speed digital FIR filter. The inputs of the system come from a Delta-Sigma modulator. This FIR filter takes 1024 inputs, multiplies them with their coefficients and adds the results. The main design task is to take the input data, which...
    Resource Type:
    Masters Thesis
    Full Text:
    High speed digital FIR filter design AN ABSTRACT OF THE

  • Analysis and design of bandpass delta-sigma A/D converters

    Creator:
    Zhai, Dalun
    Abstract:
    A new approach to oversampled delta-sigma A/D converters ( AZ modulators ) is introduced, where a differential pseudo-Npath filter stage is used as a basic cell. In this band-pass application, the z to -zN transformation is employed to realize a RAM-type pseudo-2-path lossless integrator. The bandpass second-order and 4th-order delta-sigma...
    Resource Type:
    Masters Thesis
    Full Text:
    filter stage is used as a basic cell. In this band-pass application, the z to -zN transformation is

  • Design of CMOS switched-current filters

    Creator:
    Fiez, Theresa S.
    Abstract:
    The design and implementation of Switched-Current (SI) ladder filters is described. SI filters require only a standard digital CMOS process and the power supply voltage requirement is low. SI circuits also can be potentially operated at higher frequencies than Switched-Capacitor (SC) filters due to the low-impedance wideband nodes of the...
    Resource Type:
    Dissertation
    Full Text:
    Filter Response 33 2.6.2 Sources of SI Gain Errors 36 2.6.3 Finite Impedance Effects 42 2.7