Enhancement of Voltage Stability and Power Oscillation Damping Using Static Synchronous Series Compensator with SMES


The power system network is becoming more complex nowadays and it is very difficult to maintain the stability of the power system. The main purpose of this paper proposes a 12-pulse based Static Synchronous Series Compensator (SSSC) with and without Superconducting Magnetic Energy Storage (SMES) for enhancing the voltage stability and power oscillation damping in multi area system.


Control scheme for the chopper circuit of SMES coil is designed. A three area system is taken as test system and the operation of SSSC with and without SMES is analysed for various transient disturbances in MATLAB / SIMULINK environment.


Static Synchronous Series Compensator (SSSC)

Superconducting Magnetic Energy Storage (SMES)

Multi area system

Transient disturbances



 Fig. 1 Single line diagram of the test system with SSSC with SMES


Fig. 2.Simulation result of test system

Fig. 3 Power output for Case (a) and (b)

                                                  (a) With fault


                                                          (b) Case (a)

                                   (c) Case (b)                     Time (sec)

Fig. 4 Simulation result of Voltage with fault

 Fig. 5 Simulation result for current with fault

Fig, 6 Simulation result for P & Q with fault


The dynamic performance of the SSSC with and without SMES for the test system are analysed with Matlab/simulink. In this paper SMES with two quadrant chopper control plays an important role in real power exchange.


SSSC with and without has been developed to improve transient stability performance of the power system. It is inferred from the results that the SSSC with SMES is very efficient in transient stability enhancement and effective in damping power oscillations and to maintain power flow through transmission lines after the disturbances.


[1] S. S. Choi, F. Jiang and G. Shrestha, “Suppression of transmission system oscillations by thyristor controlled series compensation”, IEE Proc., Vol.GTD-143, No.1, 1996, pp 7-12.

[2] M.W. Tsang and D. Sutanto, “Power System Stabiliser using Energy Storage”, 0-7803-5935-6/00 2000, IEEE

[3] Hingorani, N.G., “Role of FACTS in a Deregulated Market,” Proc. IEEE Power Engineering Society Winter Meeting, Seattle, WA, USA, 2006, pp. 1-6.

[4] Molina, M.G. and P. E. Mercado, “Modeling of a Static Synchronous Compensator with Superconducting Magnetic Energy Storage for Applications on Frequency Control”, Proc. VIII SEPOPE, Brasilia, Brazil, 2002, pp. 17-22.

[5] Molina, M.G. and P. E. Mercado, “New Energy Storage Devices for Applications on Frequency Control of the Power System using FACTS Controllers,” Proc. X ERLAC, Iguazú, Argentina, 14.6, 2003, 1-6.

Design and Evaluation of a Mini-Size SMES Magnet for Hybrid Energy Storage Application in a kW-Class Dynamic Voltage Restorer

IEEE Transactions on Applied Superconductivity, 2017


This paper presents the design and evaluation of a mini-size GdBCO magnet for hybrid energy storage (HES) application in a kW-class dynamic voltage restorer (DVR). The HES-based DVR concept integrates with one fast-response highpower superconducting magnetic energy storage (SMES) unit and one low-cost high-capacity battery energy storage (BES) unit. Structural design, fabrication process and finite-elementmodeling (FEM) simulation of a 3.25 mH/240 A SMES magnet wound by state-of-the-art GdBCO tapes in SuNAM are presented. To avoid the internal soldering junctions and enhance the critical current of the magnet simultaneously, an improved continuous disk winding (CDW) method is proposed by introducing different gaps between adjacent single-pancake coil layers inside the magnet. About 4.41% increment in critical current and about 3.42% increment in energy storage capacity are demonstrated compared to a conventional CDW method. By integrating a 40 V/100 Ah valve-regulated lead-acid (VRLA) battery, the SMES magnet is applied to form a laboratory HES device for designing the kW-class DVR. For protecting a 380 V/5 kW sensitive load from 50% voltage sag, the SMES unit in the HES based scheme is demonstrated to avoid an initial discharge time delay of about 2.5 ms and a rushing discharging current of about 149.15 A in the sole BES based scheme, and the BES unit  is more economically feasible than the sole SMES based scheme for extending the compensation time duration.


  1. Superconducting magnetic energy storage (SMES)
  2. SMES magnet design, hybrid energy storage (HES)
  3. Battery energy storage (BES)
  4. Continuous disk winding (CDW)
  5. Dynamic voltage restorer (DVR)
  6. Voltage sag compensation



Fig. 1. Circuit topology of the HES-based DVR.



 Fig. 2. Transient voltage curves: (a) Load voltage before compensation; (b) Compensation voltage from the DVR; (c) Load voltage after compensation.

Fig. 3. Transient voltage curves: (a) Load voltage before compensation; (b) Compensation voltage from the DVR; (c) Load voltage after compensation.


The structural design, fabrication process and FEM simulation of a 3.25 mH/240 A SMES magnet wound by state-of-the-art GdBCO tapes have been presented in this paper. The FEM simulation results have proved the performance enhancements in both the critical current and energy storage capacity by using the improved CDW scheme. Such a mini-size SMES magnet having relatively high power and low energy storage capacity is further applied to combine with a 40 V/100 Ah VRLA battery for developing a laboratory HES device in a kW-class DVR. In a 5 Kw sensitive load applications case, voltage sag compensation characteristics of three different DVR schemes by using a sole SMES system, a sole BES system and a SMES-BES-based HES device have been discussed and compared. With the fast-response high-power SMES, the maximum output current from the BES system is reduced from about 149.15 A in the BES-based DVR to 62.5 A in the HES-based DVR, and the drawback from the initial discharge time delay caused by the inevitable energy conversion process is offset by integrating the SMES system. With the low-cost high-capacity BES, practical compensation time duration is extended from about 32 ms in the SMES-based DVR to a longer duration determined by the BES capacity. Therefore, the proposed HES concept integrated with fast-response high-power SMES unit and low-cost high-capacity BES unit can be well expected to apply in practical large-scale DVR developments and other similar SMES applications.


[1] Mohd. H. Ali, B. Wu, and R. A. Dougal, “An overview of SMES applications in power and energy systems,” IEEE Trans. Sustainable Energy, vol. 1, no. 1, pp. 38-47, 2010.

[2] X. Y. Chen et al., “Integrated SMES technology for modern power system and future smart grid,” IEEE Trans. Appl. Supercond., vol. 24, no. 5, Oct. 2014, Art. ID 3801605.

[3] IEEE Std 1159-2009, IEEE Recommended Practice for Monitoring Electric Power Quality, 2009.

[4] X. H. Jiang et al., “A 150 kVA/0.3 MJ SMES voltage sag compensation system,” IEEE Trans. Appl. Supercond., vol. 15, no. 2, pp. 1903-1906, Jun. 2005.

[5] S. Nagaya et al., “Field test results of the 5 MVA SMES system for bridging instantaneous voltage dips,” IEEE Trans. Appl. Supercond., vol. 16, no. 2, pp. 632-635, Jun. 2006.