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Control and protection

Control and protection

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Power Systems Electromagnetic Transients Simulation — Recommend this title to your library

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As well as accurate modelling of the power components, effective transient simulation requires detailed representation of their control and protection processes. A variety of network signals need to be generated as inputs to the control system, such as active and reactive powers, RMS voltages and currents, phase angles, harmonic frequencies, etc. The output of the control functions are then used to control voltage and current sources as well as provide switching signals and firing pulses to the power electronic devices. These signals can also be used to dynamically control the values of resistors, inductors and capacitors. A concise description of the control functions attached to the state variable solution has been made in a previous chapter. The purpose of this book chapter is to discuss the implementation of control and protection systems in the EMT programs.

Chapter Contents:

  • 8.1 Introduction
  • 8.1 Introduction
  • 8.2 Transient analysis of control systems
  • 8.2 Transient analysis of control systems
  • 8.3 Control modelling in PSCAD/EMTDC
  • 8.3 Control modelling in PSCAD/EMTDC
  • 8.3.1 Example
  • 8.3.1 Example
  • 8.3.1.1 Time-step delay in data path
  • 8.3.1.1 Time-step delay in data path
  • 8.3.1.2 No time-step delay in data path
  • 8.3.1.2 No time-step delay in data path
  • 8.3.1.3 Root-matching technique
  • 8.3.1.3 Root-matching technique
  • 8.3.1.4 Numerical illustration
  • 8.3.1.4 Numerical illustration
  • 8.4 Modelling of protective systems
  • 8.4 Modelling of protective systems
  • 8.4.1 Transducers
  • 8.4.1 Transducers
  • 8.4.1.1 CT modelling
  • 8.4.1.1 CT modelling
  • 8.4.1.2 CVT modelling
  • 8.4.1.2 CVT modelling
  • 8.4.1.3 VT modelling
  • 8.4.1.3 VT modelling
  • 8.4.2 Electromechanical relays
  • 8.4.2 Electromechanical relays
  • 8.4.3 Electronic relays
  • 8.4.3 Electronic relays
  • 8.4.4 Microprocessor-based relays
  • 8.4.4 Microprocessor-based relays
  • 8.4.5 Circuit breakers
  • 8.4.5 Circuit breakers
  • 8.4.6 Surge arresters
  • 8.4.6 Surge arresters
  • 8.5 Summary
  • 8.5 Summary
  • References
  • References

Inspec keywords: electric current control; power system transients; power system simulation; power system protection; power capacitors; radiofrequency interference; power system control; voltage control; power inductors; resistors

Other keywords: control systems; EMT programs; network signals; transient simulation; phase angles; resistors; inductors; power components; harmonic frequencies; firing pulses; power electronic devices; switching signals; currents; current sources; RMS voltages; protection systems; capacitors

Subjects: Electromagnetic compatibility and interference; Power system control; Control of electric power systems; Transformers and reactors; Other power apparatus and electric machines; Voltage control; Power system protection; Current control

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