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High-voltage direct-current transmission,
Analysis of control interactions on FACTS assisted power systems.
Different FACTS controllers can be adjusted so that each performs
optimally in response to a system disturbance. However, when a number of
FACTS devices are electrically near then the independent setting of
controls may result in the appearance of oscillatory instabilities. This
work develops a methodology of allocating FACTS devices within a complex
network to improve the power transfer capability. It then uses load flow,
voltage collapse, eigenvalue, transient stability, and electromagnetic
transients (EMTP) computer programs in order to determine whether
interactions occur. If so, then a coordinated control philosophy is
required. Examples are provided using a large realistic network with and
without HVDC lines.
Earlier related work examined the interactions among multiple
HVDC inverters located in the same electrical receiving network. A variety
of simulation tools were used to examine the possible control interactions
that can occur. In addition to the above-mentioned study tools a physical
HVDC simulator was utilized. This provided a valuable opportunity to
compare responses between the actual control system of the HVDC simulator
and the more simplified control systems used in the computer programs. A
methodology for utilizing two different HVDC links to provide both
synchronizing torque and oscillatory damping was demonstrated.
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