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Extra info for Precision Frequency Control, Two-Volume Set: Precision Frequency Control, Volume 1: Acoustic Resonators and Filters
U. 19. Power oscillation dumping by SVC and STATCOM The shunt compensation can also be useful to damp power oscillations. 19 show oscillations of the G angle, oscillations of the transmitted power and degree of the shunt compensation. As one can see, the level of shunt compensation should be maximum-capacitive when generator accelerates – to maximize the transmittable electric power – and minimum-inductive when generator decelerates – to minimize the transmittable electric power. 3 Combined Devices The Unified Power Flow Controller is one of the most versatile members of the Flexible AC Transmission Systems family using power electronics to control all parameters that affect power flow on a transmission line [94, 95].
30 a generalized control algorithm is given. It consists of two parts. In the part dedicated to the APF, an algorithm produces signals allowing the APF to secure the stabilized sinusoidal voltage set at the point of common coupling P. In second part the gate control signals are determined, and used to delay the ignition of the converter valves and therefore to keep the DC voltage at the reference level Vd* . - KU v*3 Vd APF D Rec. Synch. + Vd* P W M - Reg. 30. Simplified control algorithm 4 Modern Power Electronics Systems for Transmission Control Unified Power Flow Controllers can control active and reactive power transmitted through the transmission line.
Series compensation can also be useful to damp power oscillations. 12 show (from above) oscillations of the G angle, oscillations of the transmitted power and degree of the series compensation. As one can see the level of series compensation should be maximum (capacitive) when generator accelerates - to maximize the transmittable electric power, and minimum (inductive) when generator decelerates - to minimize the transmittable electric power. wG ! 12. Power oscillations dumping by SSSC and TSSC Except power flow capabilities and dynamic problems there are other issues related to the FACTS devices - their location and cross-couplings.