ABSTRACT
This paper presents a step by step modeling of a new
improved hybrid photovoltaic fed distributed static compensator (PV-DSTATCOM)
in ab-c reference frame. Further the system average model is transformed to
orthogonal synchronous (d-q) reference frame. The new improved PV-DSTATCOM is
used to compensate the current distortion and reactive power, generated by a
non-linear three phase bridge uncontrolled rectifier with ohmic-inductive load.
For perfect harmonic compensation (PHC) and unit power factor (UPF) a
multi-loop control scheme is employed in which the inner controller ensures the
current harmonic and reactive power compensation, and the outer controller
takes care of the voltage regulation at the dc side of PV-DSTATCOM. The
presented system is implemented using MATLAB/Simulink tool and the performance
is discussed through obtained simulation results. Furthermore an experimental
setup is developed and the efficacy of the system is verified under practical limitations.
Both the simulation and experimental results confirm the effectiveness of the
presented system under ideal and distorted supply voltage.
KEYWORDS:
1.
Photovoltaic fed distributed static compensator
2.
Harmonic elimination
3.
Synchronous reference frame
4.
Average modeling.
SOFTWARE: MATLAB/SIMULINK
CIRCUIT
DIAGRAM:
Fig. 1 Line diagram of new hybrid
PV-DSTATCOM
EXPECTED SIMULATION RESULTS:
Fig.
2. Simulation results for ideal supply voltage (a) source voltage (b) load
current before compensation (c) source current after compensation
Fig.
3. Simulation results for distorted supply voltage (a) source voltage (b) load current
before compensation (c) source current after compensation
Fig.
4. Simulation results for unbalanced supply voltage (a) source voltage (b) load
current before compensation (c) source current after compensation
Fig.
5. Simulation results for unbalanced and distorted supply voltage (a) source
voltage (b) load current before compensation (c) source current after
compensation
CONCLUSION
In
this paper a step by step modeling of the new improved PV-DSTATCOM in abc frame
and its transformation to dq frame has been derived. With the implemented
controller and dc voltage regulator, the PV-DSTATCOM shows adequate tracking performance
and the ability to achieve unity power factor in both simulation end real time
constraints.
REFERENCES
[1] K. R.
Padiyar, FACTS Controllers in Transmission and Distribution. New Delhi, India:
New Age International, 2007.
[2] B. Singh,
A. Adya, A. P. Mittal, and J. R. P. Gupta, “Modeling and control of DSTATCOM
for three-phase, fourwire distribution systems,” Ind. Appl. Conf., vol. 4, Oct.
2005, pp. 2428–2434.
[3] S. B.
Karanki, N. Geddada, M. K. Mishra, and B. Kalyan Kumar, “A DSTATCOM topology
with reduced DC-Link voltage rating for load compensation with nonstiff
source,” IEEE Trans. Power Electron., vol. 27, no. 3, pp. 1201–121, Mar. 2012.
[4] C. Kumar
and M. K. Mishra, "An improved hybrid DSTATCOM topology to compensate
reactive and nonlinear loads," IEEE Transaction on Industrial Electronics,
vol. 61, no. 12, pp. 6517-6527, 2014.
[5] P. Jayaprakash, B. Singh, and D. P. Kothari,
“DSP implementation of three-leg VSC based three-phase four-wire DSTATCOM for
voltage regulation and power quality improvement,” in Proc IECON ’09, Portugal,
2009, pp. 312– 318.
