IRJET- Improved IUPQC Controller to Provide Grid Voltage as a STATCOM

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 05 Issue: 12 | Dec 2018 www.irjet.net p-ISSN: 2395-0072
© 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 405
IMPROVED IUPQC CONTROLLER TO PROVIDE GRID VOLTAGE AS A STATCOM
P. BHASKAR1, M. SUBRAMANYAM2, P. NAGENDRA3, J.C. VANNUR SWAMY4
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ABSTRACT - This project shows an enhanced controller
for the double topology of the bound together power
quality conditioner (iUPQC) broadening its
appropriateness in power-quality compensation, and also
in small scale grid applications. By using this controller,
past the conventional UPQC power quality highlights,
including voltage list/swell compensation, the iUPQC will
similarly give reactive power support to direct the load-
bus voltage and additionally the voltage at the grid-side
bus. In other words, the iUPQC will fill in as a static
synchronous compensator (STATCOM) at the grid side,
while giving in like manner the conventional UPQC
compensations at the load or little scale grid side.
Experimental results are given to affirm the new value of
the equipment.
1 .INTRODUCTION
Irrefutably, control contraptions gadgets have realized
astonishing mechanical updates. Notwithstanding, the
extending number of intensity equipment driven burdens
utilized all around in the business has achieved
extraordinary power quality issues. Abnormally, control
equipment driven loads for the most part require perfect
sinusoidal supply voltage so as to work appropriately,
while they are the fit ones for capricious symphonious
flows level in the conveyance framework. In this condition,
gadgets that can help these disadvantages have been made
consistently. A touch of the blueprints consolidate an
adaptable compensator, known as the bound together
power quality conditioner (UPQC) [l]– [7] and the static
synchronous compensator (STATCOM) [8]– [l3]. The
twofold topology of the UPQC, i.e., the iUPQC, was
appeared in [l4]– [l9], where the shunt Active channel acts
as an atmosphere control framework voltage source and
the arrangement one as a constrained air framework
current source, both at the fundamental recurrence. This is
a key point to even more quickly structure the control
gains, and despite streamline the LCL channel of the power
converters, which licenses upgrading on an extremely
fundamental dimension the general execution of the
compensator [20]. Nowadays, the STATCOM is, everything
considered, utilized for voltage heading [9], though the
UPQC and the iUPQC have been picked as react in due
request in regards to constantly express applications[2l].
In like manner, these last ones are utilized just
unequivocally cases, where their generally staggering
expenses are legitimized by the power quality
improvement it can give, which would be unfeasible by
utilizing traditional approaches. By joining the additional
accommodation like a STATCOM in the iUPQC gadget, a
continuously expansive situation of employments can be
come to, especially if o passed on age in sagacious matrices
and as the coupling gadget in matrix tied littler scale
frameworks. Thus, persistently, the UPQC controller needs
to pick and combine certainly the symphonious voltage
and current to be changed. On the other hand, in the iUPQC
approach, the arrangement converter carries on as a
controlled sinusoidal current source and the shunt
converter as a controlled sinusoidal voltage source. This
construes it isn't fundamental to pick the symphonious
voltage and current to be changed, since the consonant
voltages show up frequently over the arrangement current
source and the symphonious ebbs and flows stream
normally into the shunt voltage source. In real power
converters, as the exchanging recurrence gathers, the
power rate limit is decreased. Along these lines, the iUPQC
offers better designs at whatever point separated and the
UPQC if there should arise an occurrence of high-control
applications.
Fig 1 Applicability of iUPQC.
2. VOLTAGE SAGS
Voltage lists are huge issues for some ventures, and it is
presumably the most squeezing power quality issue today.
Voltage droops may cause stumbling and expansive torque
tops in electrical machines. Stumbling is caused by under
voltage protection or over current protection. These two
protections work freely. Vast torque pinnacles may make
harm the shaft or equipment associated with the shaft.
Some common purpose behind voltage lists are lightning
strikes in power lines, equipment disappointments,
coincidental contact power lines, and electrical machine
starts. In spite of being a short duration between 10
milliseconds to 1 second occasion amid which a reduction
in the RMS voltage extent happens, a little reduction in the
system voltage can cause genuine outcomes.

2.1 DEFINITION OF VOLTAGE SAGS:
The meaning of voltage droops is frequently set based on
two parameters, greatness or depth and duration.
However, these parameters are deciphered diversely by
different sources. Other critical parameters that depict
voltage lists are:
1. The point-on-wave where the voltage droops happens,
and
2. How the phase point changes amid the voltage hang. A
phase edge bounce amid a fault is because of the
change of the X/R-ratio. The phase edge hop is an
issue particularly for power gadgets utilizing phase or
zero-intersection switching.
The voltage hangs as characterized by IEEE Standard
1159, IEEE Recommended Practice for Monitoring Electric
Power Quality, is ―a decline in RMS voltage or current at
the power frequency for durations from 0.5 cycles to 1
minute, revealed as the remaining voltage.
Fig 2: Depiction of Voltage Sag
Average values are between 0.1 p.u. and 0.9 p.u., and run of
the mill fault clearing times extend from three to thirty
cycles relying upon the fault current size and the sort of
over current location and interruption. Wording used to
portray the extent of voltage list is frequently befuddling.
The prescribed phrasing as indicated by IEEE Std. 1159 is
―the droop to 20%,‖ which implies that line voltage is
diminished to 20% of ordinary esteem. Another definition
as given in IEEE Std. 1159, 3.1.73 is ―A variety of the RMS
estimation of the voltage from ostensible voltage for a
period more noteworthy than 0.5 cycles of the power
frequency however not exactly or equivalent to 1 minute.
Generally further depicted utilizing a modifier showing the
size of a voltage variety (e.g. list, swell, or interruption)
and perhaps a modifier demonstrating the duration of the
variety (e.g., quick, passing, or temporary)‖. Figure 2.1
shows the rectangular delineation of the voltage hang.
Standards related with voltage hangs are expected to be
utilized as reference records portraying single parts and
systems in a power system. Both the makers and the
purchasers utilize these standards to meet better power
quality prerequisites. Makes create items meeting the
necessities of a standard, and purchasers demand from the
makes that the item agree to the standard.
MATLAB/SIMULINK RESULT

CONCLUSION
In the enhanced iUPQC controller, the currents synthesized
by the series converter are dictated by the normal active
power of the load and the active power to give the dc-
interface voltage direction, together with a normal reactive
power to manage the grid-bus voltage. Thusly,
notwithstanding all the power-quality compensation
highlights of a conventional UPQC or an iUPQC, this
enhanced controller likewise emulates a STATCOM to the
grid bus. This new element enhances the pertinence of the
iUPQC and gives new arrangements in future situations
including shrewd grids and micro grids, including
circulated generation and vitality stockpiling systems to
more readily manage the inherent inconstancy of
inexhaustible resources such as solar and wind power.
Regardless of the expansion of one more power-quality
compensation include, the grid-voltage control lessens the
internal loop coursing power inside the iUPQC, which
would permit lower power rating for the series converter.
The experimental results checked the enhanced iUPQC
objectives. The grid-voltage control was achieved with no
load, and also when supplying a three-phase nonlinear
load. These results have exhibited a reasonable execution
of voltage direction at both sides of the iUPQC, even while
repaying harmonic current and voltage awkward nature.
REFERENCES :
1. K. Karanki, G. Geddada, M. K. Mishra, and B. K. Kumar,
―A modified three-phase four-wire UPQC topology
with reduced DC-link voltage rating,‖ IEEE Trans. Ind.
Electron., vol. 60, no. 9, pp. 3555–3566, Sep. 2013.
2. V. Khadkikar and A. Chandra, ―A new control
philosophy for a unified power quality conditioner
(UPQC) to coordinate load-reactive power demand
between shunt and series inverters,‖ IEEE Trans.
Power Del., vol. 23, no. 4, pp. 2522–2534, Oct. 2008.
3. K. H. Kwan, P. L. So, and Y. C. Chu, ―An output
regulation-based unified power quality conditioner
with Kalman filters,‖ IEEE
Trans.Ind.Electron.,vol.59,no.11, pp. 4248–4262, Nov.
2012.
4. A. Mokhtatpour and H. A. Shayanfar, ―Power quality
compensation as well as power flow control using of
unified power quality conditioner,‖ in Proc. APPEEC,
2011, pp. 1–4.
5. J. A. Munoz et al., ―Design of a discrete-time linear
control strategy for a multicell UPQC,‖ IEEE Trans. Ind.
Electron., vol. 59, no. 10, pp. 3797–3807, Oct. 2012.
6. V. Khadkikar and A. Chandra, ―UPQC-S: A novel
concept of simultaneous voltage sag/swell and load
reactive power compensations utilizing series inverter
of UPQC,‖ IEEE Trans. Power Electron., vol. 26, no.
9,pp. 2414–2425, Sep. 2011.
7. V. Khadkikar, ―Enhancing electric power quality using
UPQC: A comprehensive overview,‖ IEEE Trans.
Power Electron., vol. 27, no. 5,pp. 2284–2297, May
2012.
8. L. G. B. Rolim, ―Custom power interfaces for
renewable energy sources,‖in Proc. IEEE ISIE, 2007,
pp. 2673–2678.
9. N. Voraphonpiput and S.Chatratana,―STATCOM
analysis and controller design for power system
voltage regulation,‖ in Proc. IEEE/PES Transmiss.
Distrib. Conf. Exhib. ––Asia Pac., 2005, pp. 1–6.
10. J. J. Sanchez-Gasca, N. W. Miller, E. V. Larsen, A.
Edris, and D. A. Bradshaw, Potential benefits of
STATCOM application to improve generation station
performance,‖ in Proc. IEEE/PES Transmiss.
Distrib.Conf. Expo., 2001, vol. 2, pp. 1123–1128.
AUTHORS:
1. P. BHASKAR,
MASTER OF TECHNOLOGY in POWER ELECTRONICS
to the Jawaharlal Nehru technological university
2. M. SUBRAMANYAM,
Assistant Professor, Department of EEE.

3. P. NAGENDRA,
4. J.C. VANNUR SWAMY.

IRJET- Improved IUPQC Controller to Provide Grid Voltage as a STATCOM

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