Sökning: "power quality"

Visar resultat 1 - 5 av 708 avhandlingar innehållade orden power quality.

  1. 1. Automating Power Quality Analysis

    Författare :Emmanouil Styvaktakis; Chalmers University of Technology; []
    Nyckelord :pattern classification; expert systems; induction motors; power system transients; voltage dips; power system faults; power quality; Kalman filtering; power system monitoring; transformer saturation; short time Fourier transform;

    Sammanfattning : The increased requirements on supervision, control, and performance in modern power systems make power quality monitoring a common practise for utilities. Large databases are created and automatic processing of the data is required for fast and effective use of the available information. LÄS MER

  2. 2. On power quality and protection

    Författare :Fan Wang; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; power system protection; distance protection; power system disturbance; overcurrent protection; protection algorithms; power quality; digital protective relays;

    Sammanfattning : .... LÄS MER

  3. 3. Från kvalitetsidé till kvalitetsregim : Om statlig styrning av skolan

    Författare :Hans Nytell; Ulf P. Lundgren; Eva Forsberg; Peder Haug; Uppsala universitet; []
    Nyckelord :Education; educational systems; state governing; quality assurance; quality regime; power; legitimacy.; Pedagogik; Pedagogik; Education;

    Sammanfattning : The Swedish educational contexts were in the 1990ies characterized by extensive and rapid changes towards decentralisation and governing through goals and results. A significant feature was the introduction of instruments and techniques with a common core of “quality”. LÄS MER

  4. 4. Power-generation, Power-electronics and Power-systems issues of Power Converters for Photovoltaic Applications

    Författare :Björn Lindgren; Chalmers University of Technology; []
    Nyckelord :power systems; bang-bang control; shading tolerance; power quality; photovoltaic; embedded generation; current control; solar power generation;

    Sammanfattning : The thesis deals with issues related to solar energy systems, or more specifically, the electric systems of photovoltaic (PV) installations. Initially aspects of planning and estimating the performance of a PV-installation are considered. LÄS MER

  5. 5. Power Quality Disturbances and Protective Relays

    Författare :Fan Wang; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; overcurrent relays; component switching; frequency deviation; power system disturbance; protection algorithms; power quality; digital protective relays; impedance relays;

    Sammanfattning : This thesis combines knowledge from two areas: power quality and power system protection. Power quality concerns the effect of voltage disturbances on end-user equipment and of current disturbances on network components. Power system protection concerns the detection of faults in the system from measured voltages and currents. LÄS MER