With the increase of the size and capacity of electric power systems and the growth of widespread interconnections, the problem of power oscillations due to the reduced system damping has become increasingly serious. As a Super-Conducting Magnetic Energy Storage (SMES) unit with a self-commutated converter is capable of controlling both the active (
P) and reactive (
Q) power simultaneously and quickly, increasing attention has been focused recently on power system stabilization by SMES control.
This paper describes the effects of SMES control on the damping of power oscillations. By examining the case of a single generator connected to an infinite bus through both theoretical analyses and experimental tests (performed with a SMES unit with maximum stored energy of 16kJ and an artificial model system), the difference in the effects between
P and
Q control of SMES is clarified as follows:
(1) In the case of
P control, as the SMES unit is placed closer to the terminal of the generator, the power oscillations will decay more rapidly.
(2) In the case of
Q control, it is most effective to install the SMES unit near the mid point of the system.
(3) As compared
P control with
Q control, the former is more effective than the latter based on the conditions that the SMES unit location and the control gain are the same.
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