Download - ijre paper
48
ISSN 2348-7852 (Print) | ISSN 2348-7860 (Online) ijre.org
IJRE | Vol. 03 No. 05 | May 2016
Enhanced Designing of Five-Level Inverter based DSTATCOM using Fuzzy Logic 1Nithin S.,
2Anil Kulshrestha
1, 2 Department of Electronics and Communication, NIMS Institute of Engineering and Technology, Jaipur
Abstract–This project describes the modeling and the
control of a distribution static synchronous compensator
(DSTATCOM), with the point of enhancing the nature of
electric system; we were additionally required to create
and actualize a strategy for control by a fuzzylogic
controller. Distribution STATCOM (D-STATCOM) is
an inverter based power quality conditioner gadget used
to enhance the power quality issues in appropriation
frameworks. Exchanging beats for the five-level inverter
are created by Space Vector Modulation (SVM).
Simulation results are given to design the execution of
our voltage controller using voltage shunt processing.
Index Terms— DSTATCOM,Multilevel inverter,Static
synchronization, Space Vector Modulation (SVM)
I. INTRODUCTION
Power quality occasions are the phenomena which can
prompt stumbling of hardware, to interference of the
creation or of design operation, or imperil power framework
operation. This incorporates interferences, under voltages;
overvoltage, stage edge bounced and three stages unbalance
[1].
A. Voltage Dip
A voltage dip is a brief timeframe (10 ms to 1 minute)
occasion amid which a diminishment in r.m.s voltage extent
happens. It is regularly set just by two parameters,
profundity/greatness and length. The voltage dip greatness is
run from 10% to 90% of ostensible voltage (which relates to
90% to 10% remaining voltage) and with a span from a
large portion of a cycle to 1 min. Voltage dip in a three stage
framework influences both stage to phase(line voltage) and
stage to ground(phase voltage). A voltage dip is brought
about by a shortcoming in the utility framework, a flaw
inside the client's office or a substantial increment of the
heap current, such as beginning an engine or transformer
invigorating. The most well-known deficiencies are single
stage to ground or stage to stage cut off, lead to high current.
Because of this high current, a voltage drop happens over
the system impedance. At the point when the flaw happens
the voltage in the blamed stage drops to near zero and non-
blamed stages stays pretty much unaltered [1, 2]
B. Voltage Dip Mitigation
Voltage dips in transmission and dissemination
frameworks can be relieved in various ways. At current, an
extensive variety of exceptionally adaptable controllers,
which gain by recently accessible power devices parts, are
rising for custom power applications [3]. These devices are
utilized to control and balance out voltage in the Power
System. These devices comprise of static VAR generator or
safeguard and a reasonable controlling power electronic
device. These devices give quick acting reactive power
remuneration to power framework systems.
These devices are associated on transmission
frameworks to enhance voltage profile and framework
security amid both ordinary and possibility framework
conditions. The utilization of these devices builds
transmission limit and settles voltage in various transports
over an extensive variety of loads. These devices likewise
repay the reactive power interest of the generally differing
loads. If the heap in the framework is high, the interest of
reactive power is additionally high, so there will be high
measure of reactive power stream in the framework and it
causes the voltage drop in the line. Subsequently, the
voltage at the less than desirable end will diminish [4]. Thus
the heap in the framework is low, voltage at the less than
desirable end of the line increments because of charging
current (Ferranti impact). It implies that if the produced
reactive power is not exactly the devoured reactive power in
the framework, the voltage drops and the other way around.
Along these lines, the variety of voltage is a result of
irregularity in era and utilization of reactive power in the
framework.
Objectives of the thesis are as follows:
In any handy DSTATCOM there are losses in the
transformer windings and in the converter switches.
These loses devour dynamic influence from the AC
terminals. Appropriately, a little stage contrast
dependably exists between the VSC voltage and the
AC framework voltage.
The point of the control plan is to keep up
consistent voltage size at the point where a touchy
load under framework unsettling influences is
associated.
The control framework just measures the root mean
square (rms) voltage at the heap point, i.e., no
reactive power estimations are required.
The VSC exchanging procedure depends on a
sinusoidal PWM strategy which offers
effortlessness and great reaction.
II. BACKGROUND STUDIES
Background studies are as follows:
O. Anaya-Lara et. al. current the reproduction of
element voltage restorer and recommends four unique
techniques to infuse the voltage utilizing DVR, which are
sorted, for example, forecast pay, stage advance strategy,
voltage resistance strategy and in stage voltage infusion
technique. With a specific end goal to minimize the genuine
power infused by DVR, stage advance strategy is utilized.
For a little rate of the voltage droop which does not
influence the framework then voltage resistance technique
with least vitality infusion [5].
S.F. Torabiet. al. manages demonstrating and recreation
system of a Dynamic Voltage Restore (DVR). The DVR is a
dynamic answer for ensure delicate loads against voltage list
and swells. The new design of DVR has been proposed
utilizing enhanced d-q-0 controller strategy. This study
currents pay of hangs and swells voltage amid single line to
ground (SLG) issue and three-stage flaw. Reproduction
results completed by Matlab/Simulink check the execution
of the proposed strategy [6].
49
ISSN 2348-7852 (Print) | ISSN 2348-7860 (Online) ijre.org
IJRE | Vol. 03 No. 05 | May 2016
V.K. Ramachandaramurthyet. al. speaks to extra
supervisory control strategy amid voltage droop and swell.
In the event that 1.1 pu is adequate. What's more, this
exploration work additionally discloses how to ascertain
infused DVR voltage as indicated by its rating and pay set
point. In stage and foretell remuneration methods are reliant
on the greatness of the held supply voltage and the heap
power factor [7].
John Godask Nielsen et. al. speak to the diverse
topologies can be utilized to give the dc supply to DVR
.John Godsk Nielsen and FredeBlaabjerg proposed four
distinct topologies to give dc supply. In first case DVR is
performed with no vitality storage framework. A latent
convertor is utilized in light of the fact that exclusive
unidirectional power stream is essential. The convertor may
either put at the heap side or set at the source side. Test
utilizing a 10KVA DVR demonstrates that the no. of vitality
storage idea is possible yet an enhanced execution can be
accomplished for remunerating voltage hang utilizing put
away vitality topology [8].
Jose M. Lozano et. al. currents an idea for the
utilization of framework converter which comprises of nine
bidirectional switches organized in three gatherings each
being connected with a yield line. This matrix converter is
utilized as a part of DVR in light of a grid converter without
vitality storage device is proposed to adapt to voltage
vacillation Direct Space Vector Pulse Width Modulation
(DSVPWM) systems utilized for uneven and contorted
voltage supply [9].
III. PROPOSED WORK
A common arrangement of a VSC based D-STATCOM
is appeared in fig.1 [6]. The DSTATCOM has developed as
a promising CPD to give to voltage hang moderation as well
as a large group of other PQ arrangements. Critical uses of it
incorporate voltage control; load adjusting, power element
revision, symphonious separating, and gleam relief [7].
Table I: Simulation parameters for the proposed system
architercture
A voltage-source converter is a power electronic
device, which can produce a sinusoidal voltage with any
required extent, recurrence and stage edge. Voltage source
converters are generally utilized as a part of customizable
rate drives yet can likewise be utilized to moderate voltage
dips. The VSC is utilized to either totally supplant the
voltage or to infuse the 'missing voltage'.
Table II: Subsystem simulation parameters
Depending on the converter rating, arrangement
associated valves are masterminded in either a three-stage
two-level or three-level extension. In three-level converters.
Each VSC station is developed with particular valve
lodgings which are built to shield electromagnetic
obstruction (EMI). The valves are cooled with coursing
water and water to air heat exchangers. PWM exchanging
frequencies for the VSC normally go between 1-2 kHz
relying upon the converter topology, framework recurrence
and particular application [10].
Fig.1: Proposed simulation circuit diagram
This strategy gives great results just if voltage hang
is not combined with stage edge hop. The voltage controller
has a reaction time of few cycles. The second level of
control permits the natural fleeting over-load capacity of
DSTATCOM to be used for better execution while securing
the hardware. The third level of control including moderate
reset guarantees that the DSTATCOM does not stay close
cutoff points over an augmented timeframe [11].
50
ISSN 2348-7852 (Print) | ISSN 2348-7860 (Online) ijre.org
IJRE | Vol. 03 No. 05 | May 2016
Fig.2: Signal and scopes of proposed system
Fig.3: 48-pulse voltage source converter
1. Reactive power pay in Distribution Network can
adequately lessen the system misfortune, and in the
meantime enhance the nature of the influence.
2. Distribution STATCOM (DSTATCOM) is utilized
for power variable amendment, load adjusting,
voltage control and consonant separating in
dispersion frameworks.
3. The focal points of multilevel inverters are less
consonant substance, lower exchanging losses
incites great influence quality, lower voltage
anxiety of influence semiconductors and lower
acoustic commotion and dispose of the need of
interconnecting transformer [12].
IV. RESULTS
Results of our proposed technology will be like
following below figures:
Run the Matlab platform and initialize the project using
command statcomm.
Fig.4: Proposed simulation system
The circuit used to create the sinusoidal signs is
appeared in fig.4. The PLL gives six yields, where every
yield is a straight slope shifting somewhere around 0 and
360 degrees.
Fig.5: Proposed simulation subsystem
A simple distribution is indicated associated with a
DSTATCOM in fig.5. The supply side is spoken to by a
Thevenin comparable circuit. The circulation voltage level
is 11 kV. Two loads, which are assigned as load 1 and load
2 are associated with the dissemination transport.
Fig.6: statcom configuration for data import/export
simulation
51
ISSN 2348-7852 (Print) | ISSN 2348-7860 (Online) ijre.org
IJRE | Vol. 03 No. 05 | May 2016
Figu.7: statcom configuration for solver simulation
Performance evaluation:
Fig.8: Performance of proposed work
First, simulation was completed associating a
DSTATCOM. Voltage dips happening because of short out
flaw and increments in the heap were simulated. At first
load 1 is associated with the transport while load 2 is
definitely not. Cut off begins at 1 s and continues for 1.5 s.
After the flaw is cleared, the heap of the framework is
expanded by shutting the breaker at 3.5 s and associating
load 2.
Fig.9: Comparison between proposed and existing work
V. CONCLUSIONS
The execution of the proposed plan is contrasted and
the customary voltage controlled DSTATCOM. The voltage
shunt can be diminished by half from applying a
DSTATCOM in correlation with a SVC. The controller
design of a DSTATCOM in view of diagnostic model is
available and the expectations on the execution are approved
by experimental results. We can further enhance the
application for basic programming to acquire strength.
VI. REFERENCES
[1] Dong-Jun Won, Seon-JuAhn, Il-Yop Chung,
Joong-Moon Kim, and Seung-Il Moon, “A New
Definition of Voltage Sag Duration Considering
The Voltage Tolerance Curve”IEEE Power Tech
Conference Proceedings, Bologna, 2003
,Volume-4, ISBN- 0-7803-7967-5, 23-26 June
2003
[2] John Godsk Nielsen., “Design and Control of a
Dynamic Voltage Restorer” International journal
of science and advanced technology, (ISSN
2221- 8386), Issue-9, Volume-1, no. 9,
November 2002.
[3] Mehmet Tmay, AhmetTeke, K. CagatayByindr,
M. UrgasCuma., “Simulation and modeling of a
dynamic voltage restorer”, Cukurova University,
Turkey, Department of Electrical & Electronics
Engineering, 01330, Balcah , Adana, Turkey.
[4] Bingsen Wang, GiriVenkataramanan and
Mahesh Illindala, “Operation and Control of a
Dynamic Voltage Restorer Using Transformer
Coupled H-Bridge Converters”, IEEE
transactions on power electronics, vol 21, no. 4,
JULY 2006.
[5] O. Anaya-Lara, E. Acha, “Modeling and
Analysis of Custom Power Systems by
PSCAD/EMTDC”, IEEE Trans on Power
Delivery, PWDR vol-17 (1), Page no.-266 - 272,
2002.
[6] S.F. Torabi, D. Nazarpour, Y. Shayestehfard.,
“Compensation of Sags and Swells Voltage
Using Dynamic Voltage Restorer (DVR) During
Single Line To Ground And Three-Phase Faults”
International Journal on “Technical and Physical
Problems of Engineering” (IJTPE) Published by
International Organization of IOTPE, Issue 12
Volume- 4, Number- 3, Pages 126-132,
September, 2012.
[7] V.K. Ramachandaramurthy, A. Arulampalam, C.
Fitzer, C. Zhan, M. Barnes and N. Jenkins.,
“Supervisory control of dynamic voltage
restorers”, IEEE Proceeding on Generation,
Transmission and Distribution, Volume 151,
Issue 4, July 2004, page 509 - 516. May 2007
[8] John Godask Nielsen and FredeBlaabjerg, “A
Detailed comparison of system topologies for
Dynamic voltage restorers”, IEEE transaction on
industry application, volume-41, No. 5,
September/October 2005.
[9] Jose M. Lozano, Juan M. Ramirez, “A Novel
Dynamic Voltage Restorer based on Matrix
Converters”, Guadalajara Campus Av. Cientifica
No.1145, 45015 Zapopan, Mexico, Rosa Elvira
Correa Universidad Nacional De Colombia –
Medellin
[10] Michael John Newman, Donald Grahame
Holmes, John Godsk Nielsen, and
FredeBlaabjerg, “A Dynamic Voltage Restorer
(DVR) With Selective Harmonic Compensation
at Medium Voltage Level”, IEEE Transactions
on industry applications, Issue 6, Volume- 41,
no. 6, page- 1744-1753,November/December
2005.