CONTROL OF BATTERY OPERATED SYSTEM WITH A DC-DC BOOSTCONVERTER FED DSTATCOM USING SYNCHRONOUS REFERENCE FRAME THEORY &ACTIVE COMPONENT OF CURRENTALGORITHM

NOVATEUR PUBLICATIONS
INTERNATIONAL JOURNAL OF INNOVATIONS IN ENGINEERING RESEARCH AND TECHNOLOGY [IJIERT]
ISSN: 2394-3696
VOLUME 2, ISSUE 7, JULY-2015
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CONTROL OF BATTERY OPERATED SYSTEM WITH A DC-DC
BOOSTCONVERTER FED DSTATCOM USING SYNCHRONOUS
REFERENCE FRAME THEORY &ACTIVE COMPONENT OF
CURRENTALGORITHM
Vaishali D. Burungale,
Department of Electrical Engineering,
SVPM’s COE Malegaon(Bk),Maharashtra, India
Prof. A. Shravan Kumar
Department of Electrical Engineering,
Fabtech College of Engineering and Research,
SangolaMaharashtra, India
ABSTRACT
This paper presents a comprehensive survey of DSTATCOM control strategies put forward recently. It is
aimed at providing a broad perspective on the status of DSTATCOM control methods to researchers and
application engineers dealing with harmonic suppression issues. Many control techniques have been
designed, developed, and realized for active filters in recent years. The proposed DSTATCOM consists of a
three-leg Voltage Source Converter (VSC) with a dc bus capacitor. The PV array or battery operated boost
converter is proposed to maintain the dc link voltage of the dc bus capacitor for continuous compensation
for the load. This paper presents to evaluate the performance comparison of two control strategies for
extracting the reference currents to control the proposed DSTATCOM. The two control methods are
Synchronous Reference Frame (SRF) theory and IcosΦ algorithm. The performance of the DSTATCOM is
validated using MATLAB software with its simulink and Power System Block set (PSB) toolboxes. The
simulation results for the two control methods are compared to validate the superior performance of the
IcosΦ algorithm.
KEY WORDS: Distribution Static Compensator, Voltage Source Converter, Synchronous Reference
Frame Theory, IcosΦ Controlling Algorithm.
INTRODUCTION
A Power quality problem is an occurrence manifested as a nonstandard voltage, current or frequency that
results in a failure or a miss-operation of end user equipment’s. Utility distribution networks, sensitive
industrial loads and critical commercial operations suffer from various types of outages and service
interruptions which can cost significant financial losses. With the restructuring of power systems and with
shifting trend towards distributed and dispersed generation, the issue of power quality is going to take newer
dimensions. In developing countries like India, where the variation of power frequency and many such other
determinants of power quality are themselves a serious question, it is very vital to take positive steps in this
direction. The present work is to identify the prominent concerns in this area and hence the measures that

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can enhance the quality of the power are recommended. This work describes the techniques of correcting the
supply voltage sag, swell and interruption in a distributed system. At present, a wide range of very flexible
controllers, which capitalize on newly available power electronics components, are emerging for custom
power applications. Among these, the distribution static compensator and the dynamic voltage restorer are
most effective devices, both of them based on the VSC principle. D-STATCOM[1] injects a current into the
system to correct the voltage sag, swell and interruption. Comprehensive results are presented to assess the
performance of each device as a potential custom power solution.
The FACTS (Flexible AC Transmission Systems)[2] technology is a new research area in power
engineering. It introduces the modem power electronic technology into traditional ac power systems and
significantly enhances power system controllability and transfer limit. DSTATCOM is based on a voltage-
source inverter. The inverter under proper control can manage the capacitor i.e., the dc voltage source, to be
charged (or discharged) to the required voltage level. In this way, or by PWM controller, the amplitude of
the output voltage of the inverter can be controlled for the purpose of reactive power generation or
absorption. The control strategy is very important to the operation of DSTATCOM in order to yield desired
steady state performance and improve the integrated system dynamic behavior [3]. In this paper, the IcosΦ
controlling algorithm is compared with Synchronous Reference Frame (SRF) theory to validate the
effectiveness of the IcosΦ method. After tracking the reference currents with the help of these controllers
and by comparing it with source currents, the switching of VSC will occur and hence cancel out the
disturbances caused by the nonlinear loads. The Photo Voltaic (PV)module or battery operated boost
converter is proposed to maintain the dc bus capacitor voltage of the VSC for providing continuous reactive
power compensation, source current harmonic reduction and load compensation throughout the day. The
proposed system is simulated under MATLAB environment using SIMULINK and sim power system tool
boxes.
SYSTEM CONFIGURATION
Figure 1 shows the circuit diagram of the three-phase three-wire system which is used to feed the nonlinear
load continuously. The nature of the nonlinear load is to cause distortion in the current. After connecting the
nonlinear load, suddenly there will be a distortion in the distribution system. In order to eliminate these
distortions, the control of DSTATCOM is achieved by using SRF theory and IcosΦ algorithm. The
DSTATCOM consists of six Insulated Gate Bipolar Transistor (IGBT) with antiparallel diode based three-
leg VSC connected in shunt with the dc bus capacitor. The PV module or battery with the DC-DC boost
converter is connected with the dc bus capacitor, which is used to give a desired voltage across the capacitor
for continuous compensation [4]. According to the gate pulse given, the switching of VSC will occur which
injects a currents at the PCC through the interface inductor Lr.
Figure 1.Circuit diagram of proposed DSTATCOM

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Figure 2.Matlab Circuit before compensation
Figure 3.Source current before compensation
Figure 4.THD of Source current before compensation

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SYNCHRONOUS REFERENCE FRAME THEORY
From this algorithm, the reference source current is generated to control the proposed DSTATCOM [1]. The
load currents, PCC voltages and dc bus voltage are sensed as a feedback signal.The load currents from the a-
b-c frame are first converted to α-β-0 frame and then to d-q-0 frame. The equation used for conversion is
given below
൥
݅ௗ
݅௤
݅଴
൩=
ଶ
ଷ
‫ۏ‬
‫ێ‬
‫ێ‬
‫ێ‬
‫ۍ‬ cos ߠ െ‫ߠ݊݅ݏ‬
ଵ
ଶ
ܿ‫ݏ݋‬ ቀߠ െ
ଶగ
ଷ
ቁ െ‫݊݅ݏ‬ ቀߠ െ
ଶగ
ଷ
ቁ
ଵ
ଶ
ܿ‫ݏ݋‬ ቀߠ ൅
ଶగ
ଷ
ቁ ‫݊ݏ݅ݏ‬ ቀߠ െ
ଶగ
ଷ
ቁ
ଵ
ଶ‫ے‬
‫ۑ‬
‫ۑ‬
‫ۑ‬
‫ې‬
൥
݅௟௔
݅௟௕
݅௟௖
൩
The input to the first PI controller is the error between the reference dc bus voltageܸௗ௖ ∗and the sensed dc
bus voltage (ܸௗ௖) of DSTATCOM.
Figure 5.Matlab Circuit with SRF
Figure 6. Source current with SRF

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Figure 7.THD of source current with SRF
PROPOSED ICOSΦ ALGORITHM
IcosΦ algorithm is used to extract the reference currents. The source currents (݅௦௔,݅௦௕, and݅௦௖), the
loadcurrents (݅௅௔,݅௅௕and݅௅௖), the ac terminal voltages (‫ݒ‬௔,‫ݒ‬௕,‫ݒ‬௖) and the dc bus voltage (ܸௗ௖) are sensed. The
Icos Φ controlling algorithm is used to generate only the activecomponent of the load currents i.e. IcosΦ
(where I = amplitude of fundamental load current andΦs = displacement angle of load current). Hence by
combining the inphaseand quadrature component, the reference current can be generated.
Figure 5.Matlab Circuit with IcosΦ algorithm

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Figure 6. Source current with IcosΦ Algorithm
Figure 7.THD of source current with IcosΦ algorithm
Figure 8.Vdc&Idc

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Figure 9.Active & reactive powers of source
CONCLUSION
The simulation of the battery operated DC-DC boost converter fed three-leg VSC is done with the help of
SRF theory & IcosΦ method, When comparing SRF theory with IcosΦ method, the IcosΦ method is found
effective because the sourcecurrent THD is reduced below the (IEEE-519-1992) permissiblelimit . The
MATLAB software with its simulink and Power System Block set (PSB) toolboxes has been used to
validate the proposed system.
Table 1.Comparison of THD values of DSTATCOM
THD in
one
phase
Before
compensation
After compensation
SRF
theory
IcosΦ
algorithm
25 5.38 1.22

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REFERENCES
[1] V. KamatchiKannan and N. Rengarajan(2013) “Control of Photovoltaic System with A DC-DC Boost
Converter Fed DSTATCOM Using IcosΦAlgorithm”Journal of Applied Science and Engineering, Vol. 16,
No. 1, pp. 89-98
[2] Baggini, A. (2008), Handbook on Power Quality, New Jersey USA, John Wiley& Sons.
[3] KamatchiKannan, V. and Rengarajan, N.,(2012) “PhotovoltaicBased Distribution Static Compensator
for PowerQuality Improvement,” International Journal of ElectricalPower & Energy Systems, Vol. 42, No.
1, pp.685-692.
[4] Pinto, J. P., Pregitzer, R., Monteiro, L. F. C. andAfonso, J. L.,(2007) “3-Phase 4-Wire Shunt Active
Filterwith Renewable Energy Interface,” Presented at theConference IEEE Renewable Energy & Power
Quality,Seville: Spain.
[5] Ghosh, A. and Ledwich, G.(2002).Power Quality EnhancementUsing Custom Power Devices, Norwell,
USA,Kluwer.
[6] Hingorani, N. G.,(1995) “Introducing Custom Power,” IEEESpectrum, Vol. 32, No. 6, pp. 41- 48.
[7] Masand, D., Jain, S. and Agnihotri, G.,(2008) “Control StrategiesforDistribution Static Compensator for
PowerQuality Improvement,” IETE Journal of Research,Vol. 54, No. 6, pp. 421-428.
[8] Jou, H. L., Wu, K. D., Li, C. H. and Huang, M. S.,(2008)“Noval Power Converter Topology for Three
PhaseFour Wire Hybrid Power Filter,” IET Power Electronics,Vol. 1, No. 1, pp. 164-173.

CONTROL OF BATTERY OPERATED SYSTEM WITH A DC-DC BOOSTCONVERTER FED DSTATCOM USING SYNCHRONOUS REFERENCE FRAME THEORY &ACTIVE COMPONENT OF CURRENTALGORITHM

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