Power System Stability Enhancement Using Static Synchronous Series Compensator (SSSC)


In this study, a static synchronous series compensator (SSSC) is used to investigate the effect of this device in controlling active and reactive powers as well as damping power system oscillations in transient mode. The SSSC equipped with a source of energy in the DC link can supply or absorb the reactive and active power to or from the line. Simulations have been done in MATLAB/SIMULINK environment. Simulation results obtained for selected bus-2 in two machine power system shows the efficacy of this compensator as one of the FACTS devices member in controlling power flows, achieving the desired value for active and reactive powers, and damping oscillations appropriately.


  1. Static synchronous series compensator (SSSC)
  2. FACTS
  3. Two machine power system
  4. Active and reactive powers



 Figure 1. Two machines system with SSSC


 Figure 2. Active power of bus-2 without the installation of SSSC

.Figure 3. Reactive power of bus-2 without the installation of SSSC

Figure 4. Current of bus-2 without the installation of SSSC

Figure 5. Voltage of bus-2 without the installation of SSSC

Figure 6. Active power of bus-2 in the presence of SSSC

Figure 7. Reactive power of bus-2 in the presence of SSSC

Fig.8.Current of Bus-2 In The Presence Of SSSC


 It has been found that the SSSC is capable of controlling the flow of power at a desired point on the transmission line. It is also observed that the SSSC injects a fast changing voltage in series with the line irrespective of the magnitude and phase of the line current.  Based on obtained simulation results the performance of the SSSC has been examined in a simple two-machine system simply on the selected bus-2, and applications of the SSSC will be extended in future to a complex and multimachine system to investigate the problems related to the various modes of power oscillation in the power systems.


 [1] Gyugyi, L. (1989). “Solid-state control of AC power transmission.” International Symposium on Electric Energy Conversion in Power System, Capri, Italy, (paper No. T-IP.4).

[2] Sen, K.K. (1998). “SSSC-static synchronous series compensator: theory, modeling and publications.” IEEE Trans. Power Delivery. Vol. 13, No.1, January, PP. 241-246.

[3] L. Gyugyi, 1994, “Dynamic Compensation of AC Transmission Line by Solid State Synchronous Voltage Sources,” IEEE Transactions on Power Delivery, 9(22), pp. 904-911.

[4] Muhammad Harunur Rashid, “Power Electronics – Circuits, Devices, and Applications, “PRENTICE HALL, Englewood Cliffs, New  Jersey.07632, 1988.

[5] Amany E L – Zonkoly, “Optimal sizing of SSSC Controllers to minimize transmission loss and a novel model of SSSC to study transient response, “Electric power Systems research 78 (2008) 1856 – 1864.

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