AC Network Control Using Conventional Means

  • Stig NilssonEmail author
  • Manfredo Lima
  • David J. Young
Living reference work entry

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Part of the CIGRE Green Books book series (CIGREGB)


Electricity has become a vital means of providing power for a very wide range of domestic and industrial applications. The networks of generators, transmission, and distribution circuits that have evolved to serve the needs of electric power users are highly complex and difficult for most to fully comprehend. In principle, however, the rules governing the design and operation of AC power systems are fairly simple. Briefly stated, in any electric power system, the control objectives are as follows:
  • The system frequency must be kept constant by closely matching the generation and the connected electric loads at all times.

  • The current flows have to be controlled so that no element of the power system is overloaded.

  • The voltages throughout the power system must be kept within a narrow range, usually between about 95% and 105% of the nominal voltage.

  • The power system must continue to supply the connected loads after the loss of the largest generating unit or any other transmission system element, even when the system is already being operated with one element out of service.

This chapter discusses these common factors with emphasis on the power transmission elements of the networks; it describes the design of transmission networks and the control methods which were developed to enable electrical supply systems to operate with efficiency, reliability, robustness, and safety using conventional power system equipment. The power electronic controllers available for power system control are discussed in the “AC Network Control Using FACTS Controllers” chapter.


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© Springer Nature Switzerland AG 2019 2020

Authors and Affiliations

  1. 1.Electrical Engineering Practice, ExponentSedonaUSA
  2. 2.Electrical Engineering Practice, ChesfRecifeBrazil
  3. 3.Pernambuco UniversityRecifeBrazil
  4. 4.StaffordUK

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