This document presents a project on controlling the speed of a three-phase induction motor using space vector pulse width modulation (SVPWM). It discusses the aims of developing a simulation and prototype model for V/f speed control. It describes different PWM techniques and speed control methods for induction motors. It also explains the concepts of space vector modulation including voltage vectors, reference vectors, sector selection, and duty cycle calculation. The hardware and software implementation are outlined, including the inverter design, gate driver circuit, and MATLAB simulation model. Test results demonstrate varying the motor speed by adjusting the voltage and frequency while maintaining a constant V/f ratio.
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Speed control of IM using Space Vector Modulation
1. “V/f Speed Control of Three Phase Induction
Motor by using Space Vector Modulation”
Presented By
Mr. Jamadar A. L.
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2. Introduction
Aims and Objectives
Different Types of PWM Techniques
Speed Controlling Methods of Induction Motor
Space Vector Pulse Width Modulation Technique
Hardware Implementation
Software Implementation
Result
Conclusion
References
Outline of Presentation
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3. Introduction
The control of electric power
Three major requirements and limitations of three phase
inverter
Three phase inverter operated with space vector modulation
(SVM) Technique has
Utilization of DC link voltage and output voltage
Efficiency
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4. Aims and Objectives
The aim of this project is to develop a simulation and prototype
model of V/f Speed Control Of Three Phase Induction Motor
By Using Space Vector Modulation
The most essential Objectives are as follows.
1. To evaluate conventional experimental technique from the
point of views in Industrial Surroundings.
2. To develop necessary interface & hardware so as to
accumulate variety of test & measurement procedure.
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5. Different Types Of PWM Techniques
The most common method
Different forms of modulation:
Trapezoidal modulation
Staircase modulation
Stepped modulation
Third harmonic injected PWM
Space Vector Modulation (Present work)
Disadvantage of modulation as compare to SVM
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6. Speed Controlling Methods Of
Induction Motor
The induction motor fulfils the requirement of substantially
constant speed drive. Many motor applications require multiple
speeds or adjustable speed ranges. To achieve these
requirements the following techniques are used.
1. Rotor resistance control.
2. Stator voltage control.
3. Variable f, constant V control.
4. V/F control.
5. Slip energy recovery scheme.
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7. Space Vector Pulse Width Modulation
Technique
Three-leg Voltage Source Inverter:
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9. Voltage Space Vectors:
Considering topology 1 of Fig.4, we can see that the line
voltages Vab, Vbc, and Vca are given by
Vab = Vg
Vbc = 0
Vca = -Vg
Fig.: Topology 1-V1 (pnn) of a voltage
source inverter.
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11. Considering the last two topologies of Fig. 4 which are
repeated in Fig.8 for the sake of convenience we see that the
output line voltages generated by this topology are given by,
Vab = 0
Vbc = 0
Vca = 0
Fig.: Zero output voltage topologies
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16. Time Duration:
T1 and T2 is then given by:
Where,
Fig.: Space vector diagram for Sector 1 (a) described with the duty cycle for
each vector (b) described with it switching states 16/36
17. Switching States Corresponding Voltage Vectors
a b c Vector Magnitude Angle
0 0 0 V0
0 0
1 1 1 V7
1 0 0 V1 (2/3) 𝑉Dc 0
1 1 0 V2 (2/3) 𝑉DC π/3
0 1 0 V3 (2/3) 𝑉DC 2π/3
0 1 1 V4 (2/3) 𝑉DC π
0 0 1 V5 (2/3) 𝑉DC 4π/3
1 0 1 V6 (2/3) 𝑉DC 5π/3
Table: All switching states and its corresponding voltage vectors
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20. Major parts of blocks:
Control Circuit Blocks:
Microcontroller.
Isolator.
MOSFET Driver Circuit.
Power Circuit Blocks:
Rectifier.
Voltage Source Inverter.
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21. Three phase inverter design:
Fig.: Three phase inverter
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32. Fig.: Electromagnetic Torque and Speed
Sr. No.
Voltage
(V) in
volt
Frequenc
y (f) in
Hz
V/f Ratio
Speed (N)
in rpm
1. 400 50 8 1470
2. 300 40 7.5 1143
3. 200 25 8 698
Table: Observation Table 32/36
33. Conclusion
This project is presented to employing the inverter using space
vector pulse width modulation (SVPWM) to drive three phase
induction motor and controlling the speed of induction motor.
Speed control of three phase induction motor using space
vector pulse width modulation technique (SVPWM) is
simulated by MATLAB. As we observe that controlling the
speed of three phase induction motor by using space vector
pulse width modulation is easy to operate.
As three phase voltage decreases which is applied to the stator
of induction motor then the frequency also decreases in same
manner to maintain constant V/f ratio. The motor speed varies
as voltage and frequency varies but V/f ratio remains constant.
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34. References
[1] Programable laboratory invertor and space vector pwmIng. Pavel GAJDŮŠEK, Doctoral
Degree Programme (2) Dept. of Electrical Power Engineering, FEEC, VUT E-mail:
xgajdu02@stud.feec.vutbr.cz Supervised by: Prof. Jiří Skalický
[2] SVPWM Based Speed Control of Induction Motor Drive with Using V/F Control Based 3-
Level Inverter 1Srinivasa Rao Maturu* and 2Avinash Vujji VSRD-IJEECE, Vol. 2 (7), 2012,
421-437.
[3] A Space Vector Modulation Control Algorithm for VSI Multi-Level Converters A. Cataliotti, F.
Genduso, G. Ricco Galluzzo Dipartimento di Ingegneria eletrica Università degli Studi di
Palermo: acataliotti@ieee.org; genduso@diepa.unipa.it; ricco@diepa.unipa.it
[4] Modelling and simulation of a multilevel inverter using space vector modulation technique
ayse kocalmis1 sed at sünter
[5] IEEE transactions on industrial electronics, vol. 57, no. 7, july 2010 2473 Conventional Space-
Vector Modulation Techniques Versus the Single-Phase Modulator for Multilevel Converters
[6] Optimised Space Vector Switching Sequences for Multilevel Inverters B. P. McGrath*, D.G.
Holmes* and T. A. Lipo**
[7] 2 Space vector modulation for three-leg voltage source inverters
[8] IEEE transactions on industrial electronics, vol. 49, no. 1, February 2002 Relationship between
Space-Vector Modulation and Three-Phase Carrier-Based PWM: A Comprehensive Analysis
Keliang Zhou and Danwei Wang, Member, IEEE
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