ABSTRACT:
This paper presents the
performance and comparative analysis of Static Synchronous Compensator
(STATCOM) based on 6, 12 and 48-pulse VSC configuration. STATCOM is implemented
for regulation of the voltage at the Point of Common Coupling (PCC) bus which
has time-variable loads. The dq decoupled current control strategy is used for implementation
of STATCOM, where modulation index M and phase angle ø are varied for
achieving voltage regulation at the PCC bus. The 6, 12 and 48-pulse
configurations are compared and analyzed on the basis of Total Harmonic
Distortion (THD) and time response parameters such as rise time, maximum overshoot
and settling time. The simulation of various configurations of STATCOM is
carried out using power system block-set in MATLAB/Simulink platform.
KEYWORDS:
1.
FACTS
2.
STATCOM
3.
Decoupled current control system
4.
Voltage Sourced Converter
5.
Total Harmonic Distortion
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM:
Fig.1:Single
line diagram of STATCOM.
EXPECTED SIMULATION RESULTS:
Fig.
2: PCC bus voltage-VM for 6, 12 and 48 pulse STATCOM respectively.
Fig.
3: q-axis STATCOM current-ishq for PI controller of 6, 12 and 48
pulse STATCOM respectively.
Fig.
4: d-axis STATCOM current-ishd for PI controller of 6, 12 and 48 pulse STATCOM
respectively.
b: Active power of loads-PL
c:
Reactive power-Qstat
d: Active power-Pstat
d: Active power-Pstat
Fig.
5: Vdc, PL, Qstat and Pstat for 48
pulse STATCOM respectively.
CONCLUSION:
In
this paper, for voltage regulation and dynamic power flow control a 48-pulse
±100 MVA two-level GTO STATCOM has been modeled and simulated using decoupled current
control strategy. By varying the modulation index (M) and phase angle (ɸ) between PCC bus
voltage and STATCOM voltage, voltage regulation at the PCC bus is achieved. The
THD and various time response parameters of 6, 12 and 48 pulse STATCOM are
compared. The results show that THD of output voltage of 48 pulse STATCOM is less
than 5%, which satisfies the IEEE 519 standard. Hence, there is no need of
active filter. Also, 48 pulse STATCOM has better transient response as compared
to 6, 12 pulse STATCOM.
REFERENCES:
[1]
K. Padiyar, FACTS controllers in power transmission and distribution. New Age
International, 2007.
[2]
K. K. Sen and M. L. Sen, Introduction to FACTS controllers: theory, modeling,
and applications. John Wiley & Sons, 2009, vol. 54.
[3]
A. Edris, “Facts technology development:
an update,” IEEE Power engineering review, vol. 20, no. 3, pp.
4–9, 2000.
[4]
El-Moursi and A.M. Sharaf,
“Novel controllers for the 48-pulse vscstatcom and ssscfor
voltage regulation and reactive power compensation,” IEEE Transactions on Powersystems,
vol. 20, no. 4, pp. 1985–1997, 2005.
[5]
N. G. Hingorani and L. Gyugyi, Understanding FACTS: concepts and technology of
flexible AC transmission systems. Wiley-IEEE press, 2000.
