Fuel cell integrated unified power quality conditioner for voltage and curren...
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Analysis of the Operation of a D-STATCOM in
Unbalanced Distribution Systems Under Voltage
Disturbances
ABSTRACT:
In this paper, a study on the operation of a static synchronous compensator for distribution
systems, DSTATCOM, in relation to its performance in the presence of events that can affect
system´s power quality, is presented. Performance under short-circuit and load variation is
assessed. The IEEE 13 node test feeder, which is a highly loaded unbalanced system, is used in
the study. The D-STATCOM consists mainly of a three-level inverter with IGBTs and PWM
control. Modeling and simulations are implemented in Matlab/Simulink.
KEYWORDS:
1. D-STATCOM
2. Power Quality
3. Unbalanced Distribution Systems.
SOFTWARE: MATLAB/SIMULINK
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BLOCK DIAGRAM:
Fig. 1. The D-STATCOM structure
EXPECTED SIMULATION RESULTS:
Fig. 2. RMS voltages on bus #675, when a line-to-phase short-circuit occurs on phase A in this bus, without the D-
STATCOM
Fig. 3. RMS voltages on bus #671 when a line-to-phase short-circuit occurs on bus #675, phase A, without the D-
STATCOM.
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Fig. 4. RMS voltages on bus #675, when a line-to-phase short-circuit occurs on phase A in this bus, with the D-
STATCOM connected at bus #671.
Fig. 5. RMS voltages on bus #671 when a line-to-phase short-circuit occurs on phase A at bus #675, with the D-
STATCOM connected at bus #671.
Fig. 6. RMS voltage on bus #611 (single-phase) under an unbalanced load variation, without the D-STATCOM.
Fig. 7. RMS voltages on bus #671 under an unbalanced load variation at bus #611, without the D-STATCOM.
Fig. 8. RMS voltage on bus #611 under unbalanced load variation in this same bus, with the D-STATCOM
connected at node #671.
Fig. 9. RMS voltage on bus #671 under unbalanced load variation on bus #611, with the D-STATCOM at node
#671.
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Fig. 10. RMS voltage on bus #675 under 1ms time constant balanced load variation, without the D-STATCOM.
Fig. 11. RMS voltage on bus #671 under 1ms time constant balanced load variation, without the D-STATCOM.
Fig. 12. RMS voltage on bus #675 under 1ms time constant balanced load variation, with the D-STATCOM
connected at node #671.
Fig. 13. RMS voltage on bus #671 under 1ms time constant balanced load variation, with the D-STATCOM
connected in this node.
Fig. 14. RMS voltage on bus #675 under 20ms time constant balanced load variation, without the D-STATCOM.
Fig. 15. RMS voltage on bus #671 under 20ms time constant balanced load variation, without the D-STATCOM.
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Fig. 16. RMS voltage on bus #675 under 20ms time constant balanced load variation, with the D-STATCOM
connected at node #671.
Fig. 17. RMS voltage on bus #671 under 20ms time constant balanced load variation, with the D-STATCOM
connected at this node.
CONCLUSION:
This work presented simulation results for a D-STATCOM operating in a typical unbalanced
distribution test system. Simulations were conducted in order to assess the DSTATCOM
performance under balanced and unbalanced disturbances. A commercially available D
STATCOM topology was chosen. In addition, a standard control system was used, in order to
illustrate that, in general, good solutions for power quality related problems can be obtained
without resorting to more complex and specific problem-oriented control systems. The DC
voltage, although not shown, was in all cases, stable with low ripple. Controller parameters did
not have to be modified for different situations in order to perform satisfactorily. Finally, it can
be concluded that the D-STATCOM used in this study can contribute significantly to the
improvement of power quality in unbalanced distribution systems.
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REFERENCES:
[1] N. G. Hingorani, and L. Gyugyi, Understanding Facts: Concepts and Technology of Flexible
AC Transmission Systems. Wiley-IEEE Press, December 1999.
[2] P. Giroux, G. Sybille, and H. Le-Huy, “Modeling and Simulation of a Distribution
STATCOM using Simulink´s Power System Blockset,” in IECONOl: The 27th Annual
Conference of the IEEE Industrial Electronics Society, pp. 990-994.
[3] C. Hochgraf, and R. H. Lasseter, “Statcom Controls for Operation with Unbalanced
Voltages,” IEEE Transactions on Power Delivery, vol. 13, No. 2, April 1998.
[4] M. T. Bina, and M. D. Eskandari, “Consequence of Unbalance Supplying Condition on a
Distribution Static Compensator,” in 35th
Annual IEEE Power electronics Specialists
Conference, pp. 3900-3904.
[5] B. Blažič, and I. Papič, “Improved D-StatCom Control for Operation With Unbalanced
Currents and Voltages,” IEEE Transactions on Power Delivery, vol. 21, No. 1, January 2006.
