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