power quality improvement.pptx

1. Project Presentation On
“MODELLING AND SIMULATION FOR POWER
QUALITY IMPROVEMENT USING
CUSTOM POWER DEVICES”
By
THEJAS A V V B MANOJ RAMYA B N SAI JASWANTH G K
1CD19EE039 1CD19EE042 1CD19EE030 1CD20EE413
Under the Guidance of
Prof. ARCHANA K
ASSISTANT PROFESSOR
Dept of EEE
Department of
ELECTRICAL & ELECTRONICS Engineering

2. INTRODUCTION
• Power quality is the measurement of how close to perfect an electrical voltage is
at any given time or point.
• The power quality problem is occurrence due to the no standard voltage, current
or frequency which results in failure or mis operation of equipments
• The sensitive equipment and non linear loads are more common in both
industrial and domestic sector
• This electronic equipments are very sensitive loads against harmonics because
their control depends on either peak value or zero crossing of supplied voltage.
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3. INTRODUCTION ( Cont..)
• The faults at either transmission or distribution level may cause transient voltage
or swell in entire system
• Poor power quality can lower productivity and drive up energy costs.
• Power quality improvement solutiuons can reduce heat,vibrations and noise in
the system.
• The good power quality is defined as a steady supply voltage that stays within
the prescribed range,steady ac frequency close to the rated value and smooth
voltage curve waveform(sine wave).
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Department of Electrical & Electronics Engineering

4. ABSTRACT
A Power quality problem is an occurrence manifested as a nonstandard voltage, current or frequency that
results in a failure or a mis-operation of end use equipments . Utility distribution networks, sensitive industrial
loads, and critical commercial operations all suffer from various types of outages and service interruptions
which can cost significant financial 1oss per incident based on process down-time, lost production, idle work
forces, and other factors. With there structuring of Power Systems and with shifting trend towards distributed
and dispersed generation, the issue of Power Quality is going to take newer dimensions. The aim therefore, in
this work, is to identify the prominent concerns in the area and thereby to recommend measures that can
enhance the quality of the power, keeping in mind their economic viability and technical repercussions. In this
paper modeling and simulation using MATLAB and Simulink are presented for the custom power devices.
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5. OBJECTIVE
• The main objective functions of the power quality improvement are:
(1)Minimization of voltage fluctuation
(2)Minimization of supply frequency
(3)Control of voltages(for short and long duration)
• The compensating custom power devices are used for active filtering ,load balancing and power
factor improvement voltage regulating. These devices are mainly three types :static shunt
compensator, series and hybrid compensator. These are also called as DSTATCOM,DVR and
UPFC respectively.
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Department of Electrical & Electronics Engineering

6. Literature survey
• DFIG based wind energy conversion system:-By Bhavana Jain
,Shailendra Jain, R K Nema (2019)
o Objective of this research work is to exploit renewable energy sources more effectively, grid
connection of renewable energy sources is done through power electronics interfaces.
o In this paper , an appropriate model of wind energy conversion system is presented and
simulation techniques are discussed for studying power quality problems due voltage fluctuation
and harmonic distortion.
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Department of Electrical & Electronics Engineering

7. Literature survey
• Modelling analysis and solution of power quality:-By Dr.Mahesh
singh (April 2020)
o This paper has presented models of custom power equipment, namely D -STATCOM, DVR, and applied
them to mitigate voltage dip which is very prominent as per utilities are concerned. The highly developed
graphic facilities available in MATLAB SIMULINK were used to conduct all aspects of model
implementation and to carry out extensive simulation studieson test systems.
o It was observed that in case of DSTATCOM capacity for power compensation and voltage regulation
depends mainly on the rating of the dc storage device.
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Department of Electrical & Electronics Engineering

8. POWER QUALITY PROBLEMS
• Voltage sag
• Voltage swell
• Transients
• Harmonics
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9. CAUSES OF POWER QUAILTY PROBLEMS
 Some typical disturbances to power systems, which may cause power quality
problems are listed below:
 Lightning and natural phenomena.
 Energization of capacitor banks and transformers.
 Switching or start-up of large loads.
 Operation of non-linear and unbalanced loads.
 Failure of equipment.
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BLOCK DIAGRAM

11. Methodology
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Methodology
• Initially we started researching about various custom power devices that are required for our
project.Different types of power conditioning equipment help in improving the power quality
supplied to the final loads.
• The aim in this work is to identify the prominent concerns in the area and thereby to
recommend measures that can enhance the quality of power by using MATlab simulations.
• MATLAB Software is used in this project. Different equipment's are assembled in the
MATLAB software according the block diagram. A suitable environment is created in
MATLAB Simulink and the output of the entire system is observed.

12. Use of custom power device to improve power quality
• The concept of custom power is to use power electronic or static controllers in
the medium voltage distribution system aiming to supply reliable and high
quality power to sensitive users.
• The shunt connected devices are known as DSTATCOM.
• They are used to mitigate the majority the power system disturbances such as
voltage dips,sags,flicker unbalance and harmonics.
• For lower voltage sags the load voltage magnitude can be corrected by injecting
only reactive power into the system and for higher voltage sags both reactive
and active power are required to voltage magnitude correction.
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Department of Electrical & Electronics Engineering

13. DSTATCOM
 Distribution Static Synchronous Compensator(DSTATCOM) is
a shunt connected voltage source converter which has been used
in distribution networks to compensate the bus voltage so as to
provide improved power factor and active power control.
 DSTATCOM aim is to provide voltage regulation at the load
point and mitigate the voltage sag generated when the load is
increased.
 It operates in a similar manner as the STATCOM, with the active
power flow controlled by the angle between the AC system and
AC output converter voltages and the reactive power flow
controlled by the difference between the magnitudes of these
voltages.
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Department of Electrical & Electronics Engineering

14. STATCOM WORKING
 The load is connected to the grid and imagine the load is RL
load ,the load will draw the current from the grid which is
reactive in nature.
 The current will lag the voltage by some angle.
 The STATCOM is connected to the load and it is producing
the reactive power which is equal to the reactive power
consumed by the load.The current leads the voltage by 90℃.
 When the reactive power is injected to the grid,the net
reactive power taken from the grid becomes zero.So the grid
power will be active in nature.
 The other method is by connecting the RC load,the
STATCOM will absorb the reactive power instead of
generating it.
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15. MATLAB MODEL
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16. MATLAB MODEL
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Inverter circuit

17. WAVEFORMS
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18. Advantages
• Reduces heat
• Reduces vibrations
• Reduces noise in AC motors
• Improve equipment lifespan
• Increases operational efficiency
• Ensure the safety of electrical installation
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Department of Electrical & Electronics Engineering

19. Disadvantages
• Low efficiency when the load power is low
• Bulky and heavy dc inductor
• Low efficiency near nominal operating point
• It cannot be used in multiulevel operation
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Thank you