ABSTRACT:
This
paper presents the comparative improvement of the voltage profile of the
distributed power system using a Dynamic Voltage Restorer (DVR) and a Distributed
Static Synchronous Compensator (D-STATCOM). The IEEE benchmark 13-bus
distributed power system is used to present the distributed power grid. A
proposed DVR is connected in series with bus 632 while a D-STATCOM is connected
in parallel with bus 632. Comparative simulation results of the system with DVR
and D-STATCOM are performed by using commercial MATLAB software. It can be concluded
from the simulation results that DVR is suitable to mitigate the voltage sag of
the load side while D-STATCOM can enhance the voltage stability margin of the
buses that are located near the connected bus of the proposed D-STATCOM in the
distributed grid.
KEYWORDS:
1. Distributed
Power System
2. Dynamic
Voltage Restorer (DVR)
3. Distributed
Static Synchronous Compensator (D-STATCOM)
4. Voltage
Quality.
SOFTWARE: MATLAB/SIMULINK
DVR AND STATCOM MODELS:
Figure
1. Basic DVR Model
Figure
2. Basic D-STATCOM Model
EXPECTED
SIMULATION RESULTS:
a.
Voltage at bus 633 without DVRlD-STATCOM
b.
Voltage at bus 646 with D-STATCOM
c.
Voltage at bus 633 with D-STATCOM
d.
Voltage at bus 684 with D-STATCOM
e.
Voltage at bus 646 with DVR
f.
Voltage at bus 633 with DVR
g.
Voltage at bus 684 with DVR
Figure 3. Simulation
results of the studied system when a three-phase short-circuit fault happened
at bus 633.
CONCLUSION:
In
this paper, the voltage stability improvement of an IEEE I3-bus distributed
power system has been presented. A DVR and a D-STATCOM have been proposed and integrated
to the studied system. Based on the results from the simulation, it can be
concluded that the proposed DSTATCOM is better than DVR for improving the
voltage quality of the distributed power system under a severe fault happened.
REFERENCES:
[1] M.
Bollen, "Understanding Power Quality Problems - Voltage Sags and
Interruptions", IEEE Press Series on Power Engineering – John Wiley and
Sons, Piscataway, USA, 2000.
[2] Math
H.J. Bollen, Understanding power quality problems: voltage sags and interruptions,
IEEE Press, New York, 2000.
[3] FACTS
controllers in power transmission and distribution by K. R. Padiyar ISBN:
978-81-224-2541-3.
[4] B.
Singh, A. Adya, A. P. Mittal and J. R. P. Gupta, "Modeling, Design and
Analysis of Different Controllers for DSTATCOM," 2008 Joint International
Conference on Power System Technology and IEEE Power india Conference, New
Delhi, 2008, pp. 1-8.
[5] Devaraju,
V. C. Reddy and M. Vijaya Kumar, "Performance of DVR under different
voltage sag and swell conditions", ARPN Journal of Engineering and Applied
Sciences, Vol. 5, No. 10,2010, pp. 56-64.
