Sökning: "voltage instability"

Visar resultat 1 - 5 av 39 avhandlingar innehållade orden voltage instability.

  1. 1. Voltage collapse in power systems : analysis of component related phenomena using a power system model

    Författare :Magnus Gustafsson; Niclas Krantz; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; power system model; armature current limiter; reactive power; voltage collapse; OLTC; dynamic load; active power; field current limiter; voltage stability; load modelling; on-load tap changer; voltage instability; induction motor load;

    Sammanfattning : .... LÄS MER

  3. 2. Voltage collapse in power systems : the influence of generator current limiters, on-load tap changers and load dynamics

    Författare :Stefan Johansson; Fredrik Sjögren; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; voltage collapse; field current limiter; current-voltage trajectory; armature current limiter; load dunamics; voltage instability;

    Sammanfattning : .... LÄS MER

  4. 3. Data-driven methods for real-time voltage stability assessment

    Författare :Hannes Hagmar; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; security assessment; neural networks; Dynamic voltage security margin; machine learning; voltage instability prediction; voltage stability;

    Sammanfattning : Voltage instability is a phenomenon that limits the operation and the transmission capacity of a power system. An operation state close to the security limits enables a cost-effective utilization of the system but it could also make the system more vulnerable to disturbances. LÄS MER

  5. 4. Protection Strategies to Mitigate Major Power Systems Breakdowns

    Författare :Mattias Jonsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; system protection schemes; transient instability; distance protection; power swing detectors; voltage instability; generator coherency; wide area protection; out-of-step protection;

    Sammanfattning : This thesis deals with new methods to improve the performance of power system protection in the case of voltage- and transient instability. These methods are designed primarily to mitigate power system breakdown. Relay algorithms are proposed where conventional distance protection is combined with additional relay criteria. LÄS MER

  7. 5. Data-driven methods for real-time dynamic stability assessment and control

    Författare :Hannes Hagmar; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Machine learning; Security assessment; Neural networks; Optimal control; Dynamic voltage security margin; Voltage instability prediction; Voltage stability; Deep reinforcement learning;

    Sammanfattning : Electric power systems are becoming increasingly complex to operate; a trend driven by an increased demand for electricity, large-scale integration of renewable energy resources, and new system components with power electronic interfaces. In this thesis, a new real-time monitoring and control tool that can support system operators to allow more efficient utilization of the transmission grid has been developed. LÄS MER