This dissertation presents research on using an active filter to improve power quality by reducing harmonics from nonlinear loads. The document outlines the objectives, methodology, literature review on active filtering techniques, and simulations of power systems with and without an active filter. Simulation results show the active filter significantly reduces total harmonic distortion at the point of common coupling from 30.34% to 4.54%, demonstrating its effectiveness in mitigating power quality issues caused by nonlinear loads.
Shikrapur Call Girls Most Awaited Fun 6297143586 High Profiles young Beautie...
Prateek PPT.pptx
1. Dissertation Presentation
Guided by:
Prof. Usha Verma
Submitted by:
Prateek Singh
0822EE19MT09
Swami Vivekanand College of Engineering, Indore (M.P.), India
Electrical & Electronics Engineering Department
“Significant of Active Filter in power system to improve the power
quality by Reduction of Harmonics using Nonlinear Load”
1
2. Contents
1) Introduction
2) Literature Survey
3) Objectives
4) Methodology
5) Shunt Active Filter
6) Active Power Filter Functional Design
7) Active Power Filter Design Functional Block Diagram
8) Basic concept of active power filter
9) Implementation & Simulation
10) Simulation Model for nonlinear unbalanced load without filter
11) Simulation Model for nonlinear unbalanced load with filter
12) RESULT & DISCUSSION
13) Conclusion
2
3. General Introduction
The controlling of electricity and flow of power is not easy
when working on large or small scale. Resistor load is a
linear and easy to work in power system, but most of the
device is non-linear and this device is complicated for
power transmission and it is controlling.
This nonlinear component creates a distortion in form of
voltage, current and frequency and this distortion is called
harmonic.This harmonic is most of the presence in
frequency and decreasing the magnitude of the output
signal. In power system, this harmonic has an input signal
and creates a distorted output signal.
3
4. Cont.
In a macro power electronic, due to the requirement of
electricity in many schools, home, police station, and
other largest building consider as load, at that place the
power is provided as per use.
All these places are considered non-linear or non-ideal
load that means it generates a harmonic. Because of the
loads, these harmonies will add into the current line and
increase the distortion to the "chain". This problem
will be solved using rectification of power in varies
way.
4
5. Literature Survey
5
This chapter discusses about previous research work of different
active filters. This paper gives some survey about different views of
different authors.
Daouda Abdourahimoun et. Al [1] presents a study on the behavior
of harmonic distortion rate in current generated by linear, nonlinear
and mixed loads in offices at Niamey, Niger. Using an electric
analyzer (CA8220), a study on the behavior of harmonic distortion
rate in current generated by linear, nonlinear and mixed appliances
was conducted.
Irfan Ali et. Al [2], Presents the aim of this work which is to design
shunt active filter to mitigate and alleviate the harmonics and
reactive power issues with controller based on different theories
under unbalanced and distorted regimes
6. 6
N. Raveendra et. Al [3] this paper deals with the elimination of
harmonics at PCC in the presence of non-linear type of loads. This
paper introduces the simulation modeling of five-level
DSTATCOM for harmonic elimination. Matlab/Simulink modeling
was done for the system without DSTATCOM and its harmonic
contents were shown.
Pallavi B.Endait [4], this paper presents the harmonics analysis and
compensation which occurred in the electrical system. We use the
electrical signal analysis based on FFT technique in order to
calculate harmonics that occurred in the electrical system.
Ajay Kumar et. Al [5], This paper presents a literature review of
active power filters based on objectives, configurations, circuit
topology, converter type, supply system and control strategies.
7. Objectives
7
The main aim of this research work is to enhance the power
quality using Active Filters. In this thesis three phase three wire
voltage source Shunt Active Filter has been implemented. It
mainly deals with improvement of major power quality issues like
harmonic elimination,
reactive power compensation,
power factor correction and load balancing due to nonlinear load.
The thesis provides a complete framework for the analysis of
power quality issues.
8. METHODOLOGY
8
This chapter will describe the method that will be used for this
project in order to achieve the desired objectives. In this project, it’s
divided into various parts. For mitigating the problem of power
quality two approaches are considered.
The first one is load conditioning, that decides the load equipment
is less sensitive in the distributed network and suggest performing
an operation in under significant distortion.
The second solution to power quality problem is to install the
desired system that counteracts or suppress the power system
disturbance. Shunt active filter is full filling this power issue
problem in presence of an unbalanced load.
9. Classifications of Active Power Filter
9
According to terminology used the active filter is divided into two
categories which are voltage source active filter and current source
active filter. In current source APF inductor use as energy store
device and in voltage source active filter capacitor is used. If
compare in both active filters than VSAFs is lighter, less expensive
and controlling is easier as compare to CSAFs.
1) Voltage Source Active Filters (VSAFs)
2) Connections of Active Power Filter
3) Shunt Active Power Filter
4) Series Active Power Filter
10. Active Power Filter Functional Design
10
The functional design of active power filter is shown in
figure-10, in this block diagram the APF is a combination of
a digital and analog component. These components are work
together and eliminate harmonic distortion which is
produced due to non-linear loads.
In SPAFs consists analog component, such component is
active power filter, MOSFET gate drivers, PWM generator,
duty cycle algorithm, and non-linear loads
11. Shunt Active Filter
11
For the design shunt active filter of in any equipment first we
necessary to understand the system requirement. In shunt active filter
four major components is used, that components are input source,
active power filter, control system and non-linear load.
The input source needs to be an AC signal, which is meant to
simulate the signal found in a power system. If the necessary three-
phase AC input voltage is less than the wall outlet voltage of 850
volts, then a variance could be used to scale down the voltage to a
more reasonable level for testing purposes.
13. Basic concept of active power filter
13
The basic principle of shunt active filter in presence of the non-linear
load is equipment is shown in figure. The basic principle of shunt
active filter is to correct non-sinusoidal waveform into the sinusoidal
waveform using adding injected current. It’s required that the injected
current give the proper magnitude and waveform in power equipment.
14. Non-linear Load
14
A three phase non-ideal or non-linear load as seen in Figure
consists of a full-bridge rectifier in parallel with a resistor.
15. IMPLEMENTATION AND SIMULATION
15
According to the motive of this thesis, the simulation was tested
on the power electronic network to reduce the harmonic on the
line side due to the load side. In this system, the reactive harmonic
is maintained on the line side using shunt active filter. This active
filter is feed between the load side and source side.
All process of the shunt type active filter for the mitigation of the
harmonic on the source side is done by MATLAB/Simulink
model. In figure-16 show the block representation of Simulink
model in the shunt type active filter.
22. Harmonic analysis
22
The total harmonic and fundamental line current are analysis; in case of shunt type
active filter in the presence or without SPF using FFT analysis.
FFT Analysis of supply current when unbalancing load presence without APF
23. FFT Analysis of supply current when unbalancing
load presence with APF
23
24. Conclusion
24
In the distribution system, during the power transmission, the power
electronic equipment leads to be increasing harmonic at load side
and distorted current in the input side of the system, due to this
distortion the line current is not drive load current into the load in a
proper manner. Many researchers have solved this power quality
issue using different approaches.
On this approaches shunt active power filter is one of them. It
compensates the effect of harmonic current in input side and drive
pure sinusoidal wave signal at load side. In this thesis, we study the
simulation of three-phase power filter and analysis harmonic on the
line side. Using our Shunt Active Power Filter, we have reduced the
THD remarkably from 30.34% to 4.54% on the simulated power
system
