Damping of Electro-Mechanical Oscillations in a Multimachine System by Direct Load Control

Olof Samuelsson, B. Eliasson

Research output: Contribution to journalArticlepeer-review


Utility controlled customer loads as actuators
present new possibilities for power system control. The use of
active loads controlled by local bus frequency is proposed for
damping of electro-mechanical oscillations. The viability of
the idea is studied for one load in a three machine system
with a meshed network. Active power mode controllability
and phase angle mode observability are determined from the
eigenvectors of a differential algebraic description of the
uncontrolled system. The geographical variations in the entire
network of controllability and observability are shown to be
identical. It is presented graphically on a 3D-view of the
network topology and is used as a generalization of the term
mass scaled electrical distance. System zeroes limit the
maximum damping. An electro-mechanical mode pendulum
analog is introduced that explains this. Time simulations
verify the final controller design
Original languageEnglish
Pages (from-to)1604-1609
JournalIEEE Transactions on Power Systems
Issue number4
Publication statusPublished - 1997

Subject classification (UKÄ)

  • Other Electrical Engineering, Electronic Engineering, Information Engineering


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