This paper presents the systematic procedure of the modeling and simulation of a Distribution STATCOM (DSTATCOM) for power quality problems, voltage sag and swell based on Sinusoidal Pulse Width Modulation (SPWM) technique. Power quality is an occurrence manifested as a nonstandard voltage, current or frequency that results in a failure of end use equipments. The major problems dealt here is the voltage sag and swell. To solve this problem, custom power devices are used. One of those devices is the Distribution STATCOM (D-STATCOM), which is the most efficient and effective modern custom power device used in power distribution networks. D-STATCOM injects a current in to the system to correct the voltage sag and swell.The control of the Voltage Source Converter (VSC) is done with the help of SPWM. The proposed D-STATCOM is modeled and simulated using MATLAB/SIMULINK software.

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Modeling and Simulation of a Distribution STATCOM (D-
STATCOM) for Power Quality Problems-Voltage Sag and
Swell Based on Sinusoidal Pulse Width Modulation (SPWM)
ABSTRACT:
This paper presents the systematic procedure of the modeling and simulation of a Distribution
STATCOM (DSTATCOM) for power quality problems, voltage sag and swell based on
Sinusoidal Pulse Width Modulation (SPWM) technique. Power quality is an occurrence
manifested as a nonstandard voltage, current or frequency that results in a failure of end use
equipments. The major problems dealt here is the voltage sag and swell. To solve this problem,
custom power devices are used. One of those devices is the Distribution STATCOM (D-
STATCOM), which is the most efficient and effective modern custom power device used in
power distribution networks. D-STATCOM injects a current in to the system to correct the
voltage sag and swell.The control of the Voltage Source Converter (VSC) is done with the help
of SPWM. The proposed D-STATCOM is modeled and simulated using MATLAB/SIMULINK
software.
KEYWORDS:
1. Distribution STATCOM (D-STATCOM)
2. MATLAB/SIMULINK
3. Power quality problems
4. Sinusoidal Pulse Width Modulation (SPWM)
5. Voltage sag and swell
6. Voltage Source Converter (VSC)
SOFTWARE: MATLAB/SIMULINK

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BLOCK DIAGRAM:
Fig. 1. Schematic representation of the D-ST A TeOM for a typical custom
power application.
EXPECTED SIMULATION RESULTS:
Fig. 2. Voltage Vrms at load point, with three-phase fault: (a) Without DSTATCOM
and (b) With D-STATCOM, 750I-lf .

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Fig. 3. Voltage vrms at load point, with three phase-ground fault: (a)
Without D-STATCOM and (b) With D-STATCOM.

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Fig. 4. Voltage Vrms at load point, with line-ground fault: (a) Without DSTATCOM
and (b) With D-STATCOM.
Fig. 5. Voltage vrms at load point, with line-line fault: (a) Without DSTATCOM
and (b) With D-STATCOM.

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Fig. 6. Voltage vrms at load point, with line-line-ground fault: (a) Without
D-STATCOM and (b) With D-STATCOM.
CONCLUSION:
This paper has presented the power quality problems such as voltage sags and swell.
Compensation techniques of custom power electronic device D-ST ATCOM was presented. The
design and applications of D-STATCOM for voltage sags, swells and comprehensive results
were presented. The Voltage Source Convert (VSC) was implemented with the help of
Sinusoidal Pulse Width Modulation (SPWM). The control scheme was tested under a wide range
of operating conditions, and it was observed to be very robust in every case. For modeling and

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simulation of a D-ST ATCOM by using the highly developed graphic facilities available in MA
TLAB/SIMULINK were used. The simulations carried out here showed that the D-STATCOM
provides relatively better voltage regulation capabilities.
REFERENCES:
[I] O. Anaya-Lara, E. Acha, "Modeling and analysis of custom power systems by
PSCAD/EMTDC," IEEE Trans. Power Delivery, vol. 17, no .I, pp. 266-272, January 2002.
[2] S. Ravi Kumar, S. Sivanagaraju, "Simualgion of D-Statcom and DVR in power system,"
ARPN jornal of engineering and applied science, vol. 2, no. 3, pp. 7-13, June 2007.
[3] H. Hingorani, "Introducing custom power", IEEE Spectrum, vol. 32, no.6, pp. 41-48, June
1995.
[4] N. Hingorani, "FACTS-Flexible ac transmission systems," in Proc. IEE 5th Int Conf AC DC
Transmission, London, U.K., 1991, Conf Pub. 345, pp. 1-7.
[5] Mahesh Singh, Vaibhav Tiwari, "Modeling analysis and soltion to power quality problems,"
unpublished.