Dual Active Power Filter For LCL Resonance In Grid-Connected Voltage-Source Converters Using Grid-Current-Feedback Methodology

ISSN(Online): 2456-8805
G.Sivagovind et al., International Journal of Advanced Research in Innovative Discoveries in Engineering and Applications[IJARIDEA]
Vol.2, Issue 5,27 October 2017, pg. 20-27
© 2017, IJARIDEA All Rights Reserved
20
Dual Active Power Filter For LCL Resonance
In Grid-Connected Voltage-Source Converters
Using Grid-Current-Feedback Methodology
G.Sivagovind1
, J.Sanjeevi kumar2
1
Department of Electrical and Electronics Engineering,, Prist University, Vallam, Thanjavur, India
2
Department of Electrical and Electronics Engineering, Prist University, Vallam, Thanjavur, India
Abstract— Power system harmonics are a menace to electric power systems with disastrous consequences.
The line current harmonics cause increase in losses, instability, and also voltage distortion. With the
proliferation of the power electronics converters and increased use of magnetic, power lines have become
highly polluted. Both series and shunt filters have been used near harmonic producing loads or at the point
of common coupling to block current harmonics. Shunt filters still dominate the harmonic compensation at
medium/high voltage level, whereas shunt filters have been proclaimed for low/medium voltage ratings. With
diverse applications involving reactive power together with harmonic compensation, series filters are found
suitable. Series filtering has been preferred for harmonic compensation in distribution systems due to low
cost simplicity, reliability, and control less operation. The uncontrolled ac-dc converter suffers from
operating problems of poor power factor, injection of harmonics into the ac mains, variations in dc link
voltage of input ac supply, equipment overheating due to harmonic current absorption, voltage distortion due
to the voltage drop caused by harmonic currents flowing through system impedances, interference on
telephone and communication line. Series filter have been used traditionally for mitigating the distortion due
to harmonic current in industrial power systems. But they have many drawbacks such as resonance problem,
dependency of their performance on the system impedance, absorption of harmonic current of nonlinear
load, which could lead to further harmonic propagation through the power system.
Keywords— Dual VSC, Dc Converter, Hardware Overheating, Medium/high voltage level.
I. INTRODUCTION
Nonlinear loads, for example, soaked curls and transformers are the primary driver of
delivering music in control framework. Power electronic makes the greater part of the
because of its non-liner qualities contamination issues. The greater part of the contamination
issues are made because of the nonlinear attributes and quick exchanging of Power hardware.
Traditionally, shunt arrangement channels; mostly comprise of tuned LC channels as well as
high arrangement channels are utilized to diminish the music and power capacitors are
utilized to enhance the power factor. Be that as it may, they have the confinements of settled
remuneration, expansive size and can likewise oust reverberation conditions [1-13].
In this work both shunt arrangement channel is utilized for control quality change.
Transformers, engines, links, interrupters and capacitors are the some hardware which is
influenced by music converters essentially delivers scores and they fundamentally influence
the electronic control gadgets.
There are two courses to the diminishment of energy quality issues. The primary way is
known as load molding, which guarantees that the gear is made less touchy and compelling to
control unsettling influences. The second method is, to introduce line-molding frameworks
that balance or stifle the power framework unsettling influences .In conveyance frameworks
arrangement channels have been utilized to breaking point of symphonious streams.

21
In current electrical conveyance frameworks there has been a sudden increment of music as
a result of single stage and three-stage non-straight loads. These non-direct loads are reason
for music. Arrangement control channels have been utilized to conquer these issues. In this
framework double VSC is utilized for add up to symphonious twisting [6]. MATLAB
recreation is utilized for displaying it. Fundamentally the reason for consonant is nonlinear
load. For expelling it double VSC is utilized. Results are examined in proposal work with the
assistance of MATLAB. Consequences of arrangement channel are additionally talked about.
Add up to consonant contortion is additionally figured with the assistance of MATLAB
reproduction.
II. EXISTING SYSTEM
The literature is presented a brief introduction about series shunt filter, uses of series shunt
filter for harmonic reduction in a power system. The research work has been also discussed
some MATLAB results regarding series shunt filter. It also shows literature survey of
control techniques normally used in reduction of harmonics and reactive power.
MATLAB simulation of series filter is also discussed.
During the last decade, substantial research has been carried out in innovating different new
configurations for harmonic mitigation in ac-dc converter with R-L load. The following
papers provide guidance for completion of thesis work have been presented the performance
comparison of Shunt Power Filter (SAPF) and Hybrid Shunt Power Filter (HAPF) with
three different nonlinear loads synchronous reference frame theory are employed in this
MATLAB simulation study presented a comprehensive review of shunt filter (AF)
configurations, selection of components, control strategies has been studying analytically and
testing using computer simulations and experiments [4]. In this paper, it has been cleared that
the filter keeps the line current almost sinusoidal and in phase with the line voltage supply
describes different problems in power quality in distribution systems and their solutions
with power electronics based equipment. Series shunt and hybrid shunt power filters are
described showing their compensation characteristics and principles of operation. Different
power circuit’s topologies are analyzed and discussed and control scheme for each type of
shunt power filter are analyzed [5].
This system deals with the utilization of a STATCOM at the inverter finish of a standard
system for dynamic reactive power support. This new topology has a number of advantages.
First, with the aid of an auxiliary supply, this topology permits a black start feature. The
proposed theme might be an honest resolution for connecting island masses, offshore oil
platforms or offshore wind farms. The proposed resolution will be used with each cables and
overhead lines. Second, with the reactive power coordination between STATCOM and
systems, it offers robustness in recovery from commutation failures, and other faults in the
system. Third, with the ability of the STATCOM to act as a full of life filter, the design of the
passive filters of the system are often alleviated somewhat; this can alter recouping a number
of the prices incurred within the installation of a STACOM.
The modeling of high-power transmission system victimization typical and three hundred
technologies is delineating. A power plant situated near the rectifier station is intended
together with a spring-mass model for considering the mechanical half the generator and for
characteristic its natural frequencies. The sub synchronous interaction between controller and

G.Sivagovind et al., International Journal of Advanced
generator is shown depending on the SCR of the ac network. To increase the damping of the
SSO a sub synchronous damping controller (SSDC) is employed and also the effect on the
furthermore because the three hundred system is delineate [8].
throughput productive FPGA execution of the 'Set Partitioning in Hierarchical Trees' (SPIH
calculation is being utilized for the pressure of pictures. It utilizes intrinsic excess among
wavelet coefficients and suited for both dim and shading pictures. It utilizes dynamic
information structures thus it is self adaptive.The SPIHT calculation o
enhanced quality over other picture pressure strategies, for example, vector quantization,
JPEG and wavelets joined with quantization. It arranges the wavelet coefficients as per an
importance test and stores this data in three separate
of an info picture the picture is deteriorated into four sub
the decayed picture is compacted utilizing SPIHT codec. The compacted picture along these
lines acquired is executed utilizing FPGA. SPIHT has a clear coding system and requires no
tables. These make SPIHT a more fitting calculation for equipment execution.
power transmission systems like the projected East
power of 4000MW the SCR at the purpose of interconnection of the converter to the ac
network will cause stability issues. Especially once operated at an electrical converter aspect
network with a high electrical resistance, disturbances may occur below full operating
To counteract these difficulties the capacitor commutated device (CCC) is introduced as a
new idea of converters. The CCC shows blessings in its steady
behavior explicit once operated at weak networks[13
Dual VSC were preferred in the earlier days for harmonic compensation because they are
simple in structure and easy to install Different topologies of dual VSC were emerged during
stages of research. They are generally classified into series VSC. Series du
series impedance to block harmonics and filters diverts harmonics by means of a low
impedance path.
ISSN(Online):
Advanced Research in Innovative Discoveries in Engineering and Applications[IJARIDEA]
, IJARIDEA All Rights Reserved
nchronous damping controller (SSDC) is employed and also the effect on the
furthermore because the three hundred system is delineate [8]. [10] discussed a project, A
throughput productive FPGA execution of the 'Set Partitioning in Hierarchical Trees' (SPIH
information structures thus it is self adaptive.The SPIHT calculation offers fundamentally
importance test and stores this data in three separate records. Utilizing the pixel estimations
of an info picture the picture is deteriorated into four sub-groups utilizing DWT. At that point,
utilizing FPGA. SPIHT has a clear coding system and requires no
tables. These make SPIHT a more fitting calculation for equipment execution.
power transmission systems like the projected East-West interconnection with a high rated dc
0MW the SCR at the purpose of interconnection of the converter to the ac
network with a high electrical resistance, disturbances may occur below full operating
new idea of converters. The CCC shows blessings in its steady-state as well as transient
behavior explicit once operated at weak networks[13-16].
III. PROPOSED SYSTEM
stages of research. They are generally classified into series VSC. Series dual VSC use high
Fig.1. Proposed Block Diagram
Research in Innovative Discoveries in Engineering and Applications[IJARIDEA]
22
nchronous damping controller (SSDC) is employed and also the effect on the
] discussed a project, A
throughput productive FPGA execution of the 'Set Partitioning in Hierarchical Trees' (SPIHT)
ffers fundamentally
records. Utilizing the pixel estimations
groups utilizing DWT. At that point,
utilizing FPGA. SPIHT has a clear coding system and requires no
tables. These make SPIHT a more fitting calculation for equipment execution. For high-
West interconnection with a high rated dc
0MW the SCR at the purpose of interconnection of the converter to the ac
network with a high electrical resistance, disturbances may occur below full operating load.
state as well as transient
al VSC use high

23
The dual VSC must be designed to carry full load current, whereas filters carry only a
fraction of the current that a series filter carries. Also filters, if properly designed, supply
reactive power to the load at the fundamental frequency. Hence the most practical approach is
to use dual VSC. The series filter is made up of series elements resistance, inductance and
capacitance. When the inductive and capacitive reactance of the series filter becomes equal at
a particular harmonic frequency, series filter acts as low impedance path for that harmonic
component.
The selection of these element ratings depends on
1. Reactive power to be injected
2. Harmonics to be mitigated
3. Quality factor of the tuned filter circuit
4. Tolerance in supply frequency permitted
5. Tolerance in filter capacitance and inductance value due to ageing and temperature
changes
Dual VSC are again categorized as single tuned, double tuned, high pass damped filters, etc.
A single tuned filter is a series RLC circuit tuned for particular harmonic frequency, whereas
double tuned filter is tuned for two harmonic frequencies. The double-tuned filter is preferred
mainly in high-voltage applications, because of the reduction in the number of inductors to be
subjected to full line voltages. Triple- and quadruple-tuned filters are rarely used because of
the difficulty of adjustment of filter components. Automatically tuned filters use a control
system, which measures the fundamental frequency reactive power to be compensated by the
filter and uses the information to automatically switch the capacitance or to vary the
inductance. But the measurement or computation of reactive power is complex and time
consuming [11].
Damped Filters provide low impedance for a wide spectrum of harmonics with a single arm
filter and are less sensitive to temperature variation, frequency deviation, component
manufacturing tolerances etc., but they increase switching and maintenance problems. Also,
to achieve a similar level of filtering performance as tuned filters, the damped filters need to
be designed for higher fundamental VA ratings and hence losses in the resistor and reactor
are high Out of these available categories, the best one is to be selected that is suitable for the
specific load conditions. In order to understand the effectiveness of series filter in
compensating reactive power and harmonics of typical nonlinear load, phase controller for
varying power consumed by a series R-L element, is considered[2-17].
IV.CATEGORIZATION OF VSC
The classification of Series filter is done on the type of harmonic generation component
source present in the system &series component sys resistor, inductor & capacitor connected
in the system & are given as
A very classical type of series filter is shown in the figure where filter is connected in the
parallel with distribution system through power common coupling point having nonlinear
load characteristics.

24
Fig.2. Control diagram for VSC
The system which come with the voltage source type harmonic which are the bi product of
diode rectifier with R-L connected load it is prefer to use the series type series filter as
considered as potential remedy of harmonic mitigation. A The system which come with the
voltage source type harmonic which are the bi product of diode rectifier with R-L connected
load it is prefer to use the series type series filter as considered as potential remedy of
harmonic mitigation [15]. Series type series filter has property of purely inductive type or LC
tuned characteristics. The main component of series filter is AC line reactor & DC link filter.
The operating principle ofThe system which come with the voltage source type harmonic
which are the bi product of diode rectifier with R-L connected load it is prefer to use the
series type series filter as considered as potential remedy of harmonic mitigation. A series
type series filter has property of purely inductive type or LC tuned characteristics. Series
filter is given by these two component connected in series that AC line reactor improve
system magnitude of inductance in system that alters the path of current drawn in the rectifier
circuit [16]. These whole processes of offering magnitude in the system make system current
waveform more continuous compare to without use of filter technology in the system.
It is the most widespread method for the cessation of harmonic current in the allocation
system. Series harmonic filter are basically designed on principle of either single tuned or
band pass filter technology. As the name suggests type filter are connected in system parallel
with load. Series filter offer very low impedance in the network at the tuned frequency to
divert all the related current & at given tuned frequency.
Because of series filter always have tendency of offering some reactive power in the
circuit so the design of series filter take place for the two purpose one is the filtering purpose
& another one is to provide recommendation purpose of correcting power factor in the circuit
at desired level.
The advantage with the series type filter is that it only carry fraction of current so the
whole system AC power losses are reduced compare to series type filter. The given figure
shows the schematic diagram of 6 pulse converter system connected with series type filter
which are simply employed ever connection in distribution system have R-L load in system.
A. DUAL VOLTAGE SOURCE CONVERTER
The use of series filter creates the problem of voltage regulation at light loads. It
also increases the dc voltage ripple and ac peak current of the rectifier.

25
On the other hand, series filter suffers from lagging power factor operation as well
as the voltage drop across the filter components both at fundamental frequency as well as
harmonic frequencies. To overcome these drawbacks, a combination of both these
configurations is presented as series hybrid filter.
This configuration is able to supplement the shortfalls of both these series filters
and simultaneously it results in improvement in harmonic compensation characteristics
for varying load condition even under stiff and distorted ac mains voltage[15].
Fig.3.Overall Simulation Diagram
The simulation results are obtained through MATLAB in SIMULINK by taking system
parameter as given below.

26
Fig.4.Simulation Output
B. MATLAB BASED MODELING OF DUAL VOLTAGE SOURCE CONVERTER
To demonstrate the performance of these dual VSC feeding a three-phase converter with R-
L load, these dual VSC are modeled in MATLAB environment along with SIMULINK and
power system block set toolboxes. Different components of these converters such as low pass
filter with R-L load are simulated Fig.below shows the MATLAB model of a VSC based six
pulse ac-dc converters with R-L load. Depending on the harmonic spectrum of the supply
current, the dual VSC designed are low pass filter tuned for 5th order harmonic frequency.
The subsystem named filter consists of 5th harmonic frequency. MATLAB based model of
a six pulse ac-dc converter R-L load without series filter
V. CONCLUSION
This Paper presents the steady-state performance of AC Transmission System and VSC
based distribution system. The modeling details of system with three levels VSC are
discussed. From the simulation results, it is concluded that the system response is fast, high
quality ac voltages and ac currents can be obtained; and that the active power and the reactive
power can be controlled independently and are bidirectional. The proposed scheme also
ensures that, the receiving end voltage is maintained at unity power factor without any
compensation.
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[3] Z. Lidong and L. Dofnas, “A novel method to mitigate commutation failures in systems,” in Proc. Int. Conf. Power System Technology,
2002, vol. 1, pp. 51–56.

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[4] W. Zhinong, Y. Yang, L. Xiao, W. Huawei, S. Guoqiang, and S. Yonghui, “Direct-current predictive control strategy for inhibiting
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Dual Active Power Filter For LCL Resonance In Grid-Connected Voltage-Source Converters Using Grid-Current-Feedback Methodology

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