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1. PS7411-PROJECT WORK(PHASE-II)
PRESENTED BY UNDER THE GUIDENCE OF
I.MOSES (950313411009) Ms.M.G.POORNA KALA ME.,
ME-POWER SYSTEM ENGINEERING ASSISTANT PROFESSOR,
DEPARTMENT OF EEE.
IMPROVEMENT OF POWER QUALITY IN
DISTRIBUTIOIN SIDE USING MULTI
CONVERTER UPQC (MC-UPQC)
19/06/2015 1
POWER QUALITY IMPROVEMENT USING
MC-UPQC
9043857452
moses.sam52@gmail.com
3. ABSTRACT
This thesis is to develop a model of multi converter UPQC for
enhancement of power quality under various operating conditions.
Multi converter Unified power quality conditioner (MC-UPQC) is a
custom power device which mitigates voltage and current related PQ
issues in the power distribution systems.
Unified Power Quality Conditioner (MC-UPQC) that consists of
shunt and series voltage source converters connected back to back
and deals with load current and supply voltage imperfections.
This proposed topology also Having voltage source converter consist
series and shunt feeders lines to applied adjacent feeders to
compensate supply voltage and load current imperfection on other
feeders.
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4. OBJECTIVE
To Mitigate the major power quality problems at load
side of power system.
To enhancement of power quality in high power
distribution network.
To Compensation of voltage and current issues of
multi bus or multi feeder system.
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5. INTRODUCTION
Electric equipment made with semiconductor devices
appears to be as sensitive and polluting as ever.
Non-linear devices, such as power electronics converters,
increase overall reactive power demanded by the
equivalent load and inject harmonic currents into the
distribution grid.
It is well known that the reactive power demand causes a
drop in the feeder voltage and increases the losses.
The presence of harmonic currents can cause additional
losses and voltage waveform distortions, and so cause
poor power quality.
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6. CONT…
One modern solution that deals with both load current and supply
voltage imperfections is the MC- Unified Power Quality Conditioner
(MC-UPQC).
The idea can be theoretically extended to multibus/multifeeder
systems by adding more series VSC.
Such a solution can compensate for different power quality
phenomena, such as: sags, swells,voltage imbalance, flicker,
harmonics and reactive currents.
This system in both feeders by sharing power compensation
capabilities between two adjacent feeders
• MC-UPQC-link voltage requirement for the shunt and series active
filters is not the same.
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7. EXISTING SYSTEM
The three phase three wire Single UPQC is used to modified
UPQC topology to maintain voltage rating of dc-link capacitor
largely influences the compensation performance of an active
filter.
FACTS devices are only used only for Transmission system.
Cascaded multi converter based inverter used to design UPQC.
Shunt & Series Active power filter (DVR And DSTATCOM) Used
to design MC-UPQC the VSC connected only One feeder bus in
series with distribution network.
Nonlinear loads and unbalanced loads have degraded the power
quality (PQ) in the power distribution network
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8. PROPOSED SYSTEM
This MC-UPQC designed controller is connected to a source in order to
compensate voltage and current in the two feeders.
multilevel converter (MC) for power quality improvement of a
distribution.
In a multi-bus, three independent feeders distribution system, the load
reactive power and current harmonics of one feeder are compensated
using MC as shunt compensator.
In the other two feeders the voltage harmonics, voltage sag/swell and
interruptions are compensated as series VSC compensators.
To overcome this PQ problems using the PWM generator in MC-UPQC
unified power quality conditioner (UPQC) in load system
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11. LITERATURE REVIEW
S. V. R. Kumar and S. S. Nagaraju “Simulation of DSTATCOM and DVR in
power systems,” ARPN J. Eng. Appl. Sci., vol. 2, no. 3, pp. 7–13, Jun.
2007.
Power quality has become an important issue in recent times when
many utilities around the world find very difficult to meet energy
demands which leads to load shedding and power quality problem.
The power-quality problems which these compensator address
include voltage sags/swells, load voltage harmonic distortions, and
unbalancing
Tap changing transformer is takes care of a limited range of voltage
sag.
Needs routine maintenance of its parts
Uneconomical size and requires frequent replacement of
transformer oil
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12. CONT…
S. Srikanthan and M. K. Mishra, “DC capacitor voltage equalization in neutral
clamped inverters for MC-UPQC application,” IEEE Trans. Ind. Electron.,
vol. 57, no. 8, pp. 2768–2775, Aug. 2010.
Multilevel neutral point clamped (NPC) inverter systems are
increasingly used in load compensation applications.
Resulting in degradation of tracking performance of
the voltage source inverter
However, the most significant problem associated with these
compensators is the capacitor voltage imbalances and drift
due to dc components.
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13. CONT….
• M. K. Mishra and K. Karthikeyan, “Design and analysis of voltage source
converter for active compensators to compensate unbalanced and non-
linear loads,” in Proc. IPEC, 2007, pp. 649–654.
A proper design of the voltage source inverter used for the load
compensation is very essential to achieve good steady state and
dynamic performance.
The proposed method can be extended to design the
voltage source inverter of configuration and non-linear loads.
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14. PROBLEM FORMATION
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Structure of MC-UPQC
•Two feeders connected to two different substations supply the loads L1 and
L2. The MC-UPQC is connected to two buses BUS1 and BUS2 with voltages
of and , respectively. The shunt part of the MC-UPQC is also connected to
load .
•A transient can occur when a load is either connected or disconnected to
from the MC-UPQC or a voltage sag/swell on the supply side occurs.
•The design of the series capacitor and the other VSC parameters
have significant effect on the performance of the compensator
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16. 19/06/2015
PROBLEM SOLUTION
•DESIGN OF VSC PARAMETERS
•Design of Series Active Filter VSC Parameters
•Design of Vdcfor the Proposed VSC Topology
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29. CONCLUSION
In the thesis, the main objectives for the utilization of the studied
Equipment have been to reducing the distortion level occurring in the
Cases of harmonics generating loads in distribution networks and
Highly improving the power quality of the system.
This MC-UPQC proposed topology is capable of Fully protecting critical
and sensitive loads against distortions.
Power transfer between two adjacent feeders for sag/swell
and interruption compensation.
30. FUTURE SCOPE
The More advanced controllers such as fuzzy
controller, artificial neutral network,
instantaneous power theory.
It can also be used with MC-UPQC to make the
system more effective and Effectiveness.
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31. REFERENCE
M. Bollen, Understanding Power Quality Problems: Voltage Sags and
Interruptions. New York: IEEE Press, 2008
B. Singh and J. Solanki, “Load compensation for diesel generator-based
isolated generation system employing DSTATCOM,” IEEE Trans. Ind.
Electron., vol. 47, no. 1, pp. 238–244, Jan./Feb. 2011.
R. Stala, “Application of balancing circuit for dc-link voltages balance in
a single-phase diode-clamped inverter with two three-level legs,” IEEE
Trans. Ind. Electron., vol. 58, no. 9, pp. 4185–4195, Sep. 2011.
Yash Pal, A. Swarup, and Bhim Singh, “A Review of Compensating Type
Custom Power Devices for multi converter Power Quality Improvement”
2008 Joint International Conference on Power System Technology
(POWERCON) and IEEE Power India Conference New Delhi.
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