Power System Dynamics and Stability Quiz
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Questions and Answers

What happens if one or more of the generators lose synchronism following a disturbance?

  • Synchronism is maintained without any impact
  • Power can be transferred between the machines with loss
  • No net power can be transferred between the machines (correct)
  • The generator efficiency increases

    • When is a system said to be transiently unstable?

  • Following a disturbance, one or more of the generators lose synchronism (correct)
  • All generators maintain synchronism at all times
  • There are no disturbances in the system
  • The voltage magnitude is fixed for all generators

    • What is the primary requirement for all generators to operate as an interconnected system?

  • The voltage magnitude must be different for each generator
  • The rotors must turn at exactly the same speed (correct)
  • The rotors must turn at different speeds
  • The generators must have different pole numbers

    • What type of models need to be developed in order to study the transient response of a power system?

    <p>Both electrical and mechanical models for the generators</p> Signup and view all the answers

    In the generator mechanical model, what does 'J' represent?

    <p>Moment of inertia of turbine &amp; rotor</p> Signup and view all the answers

    What is the primary consequence of a loss of synchronism in an interconnected power system?

    <p>Net power transfer between machines becomes impossible</p> Signup and view all the answers

    Which model treats the generator as a voltage source behind the direct-axis transient reactance with a fixed voltage magnitude but changing angle according to the mechanical dynamics?

    <p>Classical model</p> Signup and view all the answers

    In which time frame following a system disturbance do we need to develop models for the generator's transient response?

    <p>Seconds</p> Signup and view all the answers

    What does 'J' represent in the generator mechanical model?

    <p>Moment of inertia of turbine &amp; rotor</p> Signup and view all the answers

    What is the requirement for all generators to remain in synchronism in an interconnected power system?

    <p>Same speed</p> Signup and view all the answers

    What is the consequence of a loss of synchronism in an interconnected power system?

    <p>The power flow between machines becomes unidirectional</p> Signup and view all the answers

    What is the equivalent electrical torque in the generator mechanical model?

    <p>Torque due to electrical dynamics</p> Signup and view all the answers

    What does the classical model of the generator consider it as?

    <p>Voltage source behind the direct-axis transient reactance</p> Signup and view all the answers

    What is the primary focus of studying the transient response of a power system?

    <p>To understand system behavior following disturbances</p> Signup and view all the answers

    What is the moment of inertia 'J' in the generator mechanical model?

    <p>Angular acceleration of the rotor</p> Signup and view all the answers

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