The document describes the operation of a 3-phase inverter that generates 3-phase AC voltage from a DC source using switches in both 180 degree and 120 degree conduction modes. In the 180 degree mode, each switch is closed for 180 degrees before the next switch closes. In the 120 degree mode, each switch is closed for 120 degrees. Tables show the switch states and resulting phase and line voltages for each 60 degree period. While the output waveforms are not pure sine waves, they approximate the desired 3-phase voltages. The inverter circuit provides a simple example for understanding 3-phase inverter operation.
Inverter is a device which convert a DC input supply voltage into symmetric AC voltage of desired magnitude and frequency at the output side. It is also know as DC-AC converter.
Ideal and practical inverter have sinusoidal and no-sinusoidal waveforms at output respectively.
If the input dc is a voltage source, the inverter is called a Voltage Source Inverter (VSI). One can similarly think of a Current Source Inverter (CSI), where the input to the circuit is a current source. The VSI circuit has direct control over ‘output (ac) voltage’ whereas the CSI directly controls ‘output (ac) current.
Inverter is a device which convert a DC input supply voltage into symmetric AC voltage of desired magnitude and frequency at the output side. It is also know as DC-AC converter.
Ideal and practical inverter have sinusoidal and no-sinusoidal waveforms at output respectively.
If the input dc is a voltage source, the inverter is called a Voltage Source Inverter (VSI). One can similarly think of a Current Source Inverter (CSI), where the input to the circuit is a current source. The VSI circuit has direct control over ‘output (ac) voltage’ whereas the CSI directly controls ‘output (ac) current.
Inverter is a device which convert a DC input supply voltage into symmetric AC voltage of desired magnitude and frequency at the output side. It is also know as DC-AC converter.
Ideal and practical inverter have sinusoidal and no-sinusoidal waveforms at output respectively.
If the input dc is a voltage source, the inverter is called a Voltage Source Inverter (VSI). One can similarly think of a Current Source Inverter (CSI), where the input to the circuit is a current source. The VSI circuit has direct control over ‘output (ac) voltage’ whereas the CSI directly controls ‘output (ac) current.
Inverter is a device which convert a DC input supply voltage into symmetric AC voltage of desired magnitude and frequency at the output side. It is also know as DC-AC converter.
Ideal and practical inverter have sinusoidal and no-sinusoidal waveforms at output respectively.
If the input dc is a voltage source, the inverter is called a Voltage Source Inverter (VSI). One can similarly think of a Current Source Inverter (CSI), where the input to the circuit is a current source. The VSI circuit has direct control over ‘output (ac) voltage’ whereas the CSI directly controls ‘output (ac) current.
The inverter is a static device. It can convert one form of electrical power into other forms of electrical power. But it cannot generate electrical power. Hence the inverter is a converter, not a generator.
As we have discussed that out of various triggering methods to turn the SCR, gate triggering is the most efficient and reliable method. Most of the control applications use this type of triggering because the desired instant of SCR turning is possible with gate triggering method.
These slides provide an elementary description of Power Electronics and its application domains. It also shows the different power devices and converters.
Chopper basically uses a Thyristor for high power applications. The process of turning off a conducting Thyristor is known as commutation. Here Thyristor is turned off by a current pulse that is why it is called a Current Commutated Chopper.
Part of Lecture series on EE321N, Power Electronics-I delivered by me during Fifth Semester of B.Tech. Electrical Engg., 2012
Z H College of Engg. & Technology, Aligarh Muslim University, Aligarh
Please comment and feel free to ask anything related. Thanks!
The inverter is a static device. It can convert one form of electrical power into other forms of electrical power. But it cannot generate electrical power. Hence the inverter is a converter, not a generator.
As we have discussed that out of various triggering methods to turn the SCR, gate triggering is the most efficient and reliable method. Most of the control applications use this type of triggering because the desired instant of SCR turning is possible with gate triggering method.
These slides provide an elementary description of Power Electronics and its application domains. It also shows the different power devices and converters.
Chopper basically uses a Thyristor for high power applications. The process of turning off a conducting Thyristor is known as commutation. Here Thyristor is turned off by a current pulse that is why it is called a Current Commutated Chopper.
Part of Lecture series on EE321N, Power Electronics-I delivered by me during Fifth Semester of B.Tech. Electrical Engg., 2012
Z H College of Engg. & Technology, Aligarh Muslim University, Aligarh
Please comment and feel free to ask anything related. Thanks!
This presentation describes the Voltage Source Inverter (VSI) - Six Step Switching - Pole voltages and its control - Frequency control of line voltages
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Modeling and Simulation of SVPWM Based ApplicationIJAPEJOURNAL
Recent developments in power electronics and semiconductor technology have lead to widespread use of power electronic converters in the power electronic systems. A number of Pulse width modulation (PWM) schemes are used to obtain variable voltage and frequency supply from a three-phase voltage source inverter. Among the different PWM techniques proposed for voltage fed inverters, the sinusoidal PWM technique has been popularly accepted. But there is an increasing trend of using space vector PWM (SVPWM) because of their easier digital realization, reduced harmonics, reduced switching losses and better dc bus utilization. This project focuses on step by step development of SVPWM technique. Simulation results are obtained using MATLAB/Simulink software for effectiveness of the study.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Study of sinusoidal and space vector pulse width modulation techniques for a ...eSAT Journals
Abstract
This paper compares and evaluates the performance of Sinusoidal Pulse Width Modulation (SPWM) and Space Vector Pulse Width
Modulation (SVPWM) techniques for a three-level inverter by cascading two two-level inverters. In this topology, four power
semiconductor switches are used per phase and a total of twelve switches are required. The simulation study shows that SVPWM is
superior to SPWM in the aspects of better DC-bus utilization and offering better spectral performance.
Index Terms: space vector modulation, multi-level inverters, sine-triangle modulation, and cascaded inverter
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Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
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Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
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Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
4. Three Phase Inverter- 180 Degree
Conduction Mode
• let’s start switching sequence by closing the switch S1 in the first segment
of the ideal circuit and let’s name the start as 00. Since the selected time
of conduction is 1800 the switch S1 will be closed from 0º to 1800.
5. • But after 1200of the first phase, the second phase will also have a positive
cycle as seen in the three-phase voltage graph, so switch S3 will be closed
after S1. This S3 will also be kept closed for another 1800. So S3 will be
closed from 1200 to 3000 and it will be open only after 3000.
6.
7.
8. Step1: (for 0-60) S1, S4&S5 are closed while the remaining three switches are
open. In such a case, the simplified circuit can be as shown below.
So for 0 to 60: Vao = Vco= Vs/3 ; Vbo = -2Vs/3
By using these we can derive the line voltages as:
Vab = Vao – V bo = Vs
Vbc = Vbo – Vco = -Vs
Vca = Vco – Vao = 0
9. Step2: (for 60 to 120) S1, S4&S6 are closed while the remaining three
switches are open. In such a case, the simplified circuit can be as shown
below.
So for 60 to 120: Vbo = Vco= -Vs/3 ; Vao = 2Vs/3
By using these we can derive the line voltages as:
Vab = Vao – Vbo = Vs
Vbc = Vbo – Vco = 0
Vca = Vco – Vao = -Vs
10. Step3: (for 120 to 180) S1, S3&S6 are closed while the remaining three
switches are open. In such a case, the simplified circuit can be drawn as
below.
So for 120 to 180: Vao = Vbo= Vs/3 ; Vco = -2Vs/3
By using these we can derive the line voltages as:
Vab = Vao – Vbo = 0
Vbc = Vbo – Vco = Vs
Vca = Vco – Vao = -Vs
11. Similarly, we can derive the phase voltages and line voltages for
the next steps in the sequence. And it can be shown as the figure
given below:
Time
Period
Switches
in On
State
Vao Vbo Vco Vab Vbc Vca
0 – 60 S1, S4, S5 Vs/3 -2Vs/3 Vs/3 Vs -Vs 0
60 – 120 S1, S4, S6 2Vs/3 -Vs/3 -Vs/3 Vs 0 -Vs
120 – 180 S1,S3,S6 Vs/3 Vs/3 -2Vs/3 0 Vs -Vs
180 – 240 S2,S3,S6 -Vs/3 2Vs/3 -Vs/3 -Vs Vs 0
240 – 300 S2, S3,S5 -2Vs/3 Vs/3 Vs/3 -Vs 0 Vs
300 – 360 S2,S4,S5 -Vs/3 -Vs/3 2Vs/3 0 -Vs Vs
15. The 120º mode is similar to 180º at all aspects except the closing time of each switch is reduced
to 120, which were 180 before. As usual, let’s start switching sequence by closing the switch S1 in
the first segment and be the start number to 0º. Since the selected time of conduction is 120º
the switch S1 will be opened after 120º, so the S1 was closed from 0º to 120º.
16. Now after 120º of the first phase, the second phase will also have a positive
cycle as mentioned before, so switch S3 will be closed after S1. This S3 will
also be kept closed for another 120º. So S3 will be closed from 120º to 240º.
17. Similarly, the third phase also has a positive cycle after 120º of the second phase
positive cycle so the switch S5 will be closed after 120º of S3 closing. Once the switch
is closed, it will be kept closed for coming 120º before being opened and with that,
the switch S5 will be closed from 240º to 360º
18. This cycle of symmetrical switching will be continued for achieving the desired three-
phase voltage. If we fill in the beginning and ending switching sequence in the above
table we will have a complete switching pattern for 120º conduction mode as below.
19. From the above table we can understand that:
From 0-60: S1&S4 are closed while remaining switches are opened.
From 60-120: S1 &S6 are closed while remaining switches are opened.
From 120-180: S3&S6 is closed while remaining switches are opened.
From 180-240: S2&S3 are closed while remaining switches are opened
From 240-300: S2&S5 are closed while remaining switches are opened
From 300-360: S4&S5 are closed while remaining switches are opened
And this sequence of steps goes on like that. Now let us draw the
simplified circuit for each step to better understand the current flow
and voltage parameters of the 3 Phase Inverter circuit.
20. Step1: (for 0-60) S1, S4 are closed while the remaining four switches are
open. In such a case, the simplified circuit can be shown as below.
So for 0 to 60: Vao = Vs/2, Vco= 0 ; Vbo = -Vs/2
By using these we can derive the line voltages as:
Vab = Vao – Vbo = Vs
Vbc = Vbo – Vco = -Vs/2
Vca = Vco – Vao = -Vs/2
21. Step2: (for 60 to 120) S1 &S6 are closed while the remaining
switches are open. In such a case, the simplified circuit can be
shown as below.
So for 60 to 120: Vbo =0, Vco= -Vs/2 & Vao = Vs/2
By using these we can derive the line voltages as:
Vab = Vao – Vbo = Vs/2
Vbc = Vbo – Vco = Vs/2
Vca = Vco – Vao = -Vs
22. Step3: (for 120 to 180) S3&S6 are closed while the remaining switches are
open. In such a case, the simplified circuit can be shown as below.
So for 120 to 180: Vao =0, Vbo= Vs/2 & Vco = -Vs/2
By using these we can derive the line voltages as:
Vab = Vao – V bo = -Vs/2
Vbc = Vbo – Vco = Vs
Vca = Vco – Vao = -Vs/2
23. Similarly, we can derive the phase voltages and line voltages for
the next steps in the sequence. And it can be shown as the figure
given below:
Time
Period
Switches
in On
State
Va0 Vb0 Vc0 Vab Vbc Vca
0 – 60 S1, S4, S5 Vs/2 -Vs/2 0 Vs -Vs/2 -Vs/2
60 – 120 S1, S4, S6 Vs/2 0 -Vs/2 Vs/2 Vs/2 -Vs
120 – 180 S1,S3,S6 0 Vs/2 -Vs/2 -Vs/2 Vs -Vs/2
180 – 240 S2,S3,S6 -Vs/2 Vs/2 0 -Vs Vs/2 Vs/2
240 – 300 S2, S3,S5 -Vs/2 0 Vs/2 -Vs/2 -Vs/2 Vs
300 – 360 S2,S4,S5 0 -Vs/2 Vs/2 Vs/2 -Vs Vs/2
26. Conclusion
• It can be seen in the output graphs of both 180o and
120o switching cases that we have achieved an
alternating three-phase voltage at the three output
terminals.
• Although the output waveform is not a pure sine wave,
it did resemble the three-phase voltage waveform.
• This is a simple ideal circuit and approximated
waveform for understanding 3 phase inverter working.
• You can design a working model based on this theory
using thyristors, switching, control, and protection
circuitry.