Close Loop Control of Induction Motor Using Z-Source Inverter
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This paper presents a new closed loop control method for induction motors using a z-source inverter, employing field oriented control (FOC) to enhance performance. It discusses the advantages of z-source inverters over traditional inverters and details the implementation of the indirect field-oriented control method in MATLAB simulations. The results show efficient speed control, achieving a stable speed of 160 r/s while highlighting the potential for future applications in various induction motor ratings.
![IJSRD - International Journal for Scientific Research & Development| Vol. 3, Issue 10, 2015 | ISSN (online): 2321-0613
All rights reserved by www.ijsrd.com 260
Close Loop Control of Induction Motor Using Z-Source Inverter
Vijay joshi1
Prof. Jitendra Singh Shakya2
1,2
Samrat Ashok Technological Institue, Vidisha (M.P)
Abstract— In this paper a new closed loop control of
induction motor fed by a Z – source inverter based on the
vector control or field oriented control strategy is presented.
Induction motor is supplied by Z – source inverter, in the Z
– source inverter the term Z denotes impedance which
means a combination of L & C element which are cross
connected. The Z-source inverter consists of a unique
impedance network (or circuit) to couple the inverter main
circuit to the power supply, hence providing great features
that cannot be observed in the conventional voltage-source
inverter and current-source inverters in which capacitor and
inductor are used, respectively.In the field oriented control
method or vector control method speed of the induction
motor, torque & 3 phase stator current is given to the field
oriented controller and gate pulses for the inverter is
generated to obtain the desired operation of the induction
motor.
Key words: FOC method, Z-source inverter, MATLAB
simulation
I. INTRODUCTION
The main aim of this paper is the close loop control of
Induction Motor by field oriented control (FOC) method
using Z-source inverter.
In this paper indirect field-oriented control (IFOC)
method has been used to carry out the control the induction
motor because of its simplicity. The close loop control of
induction motor is carried out with the help of MATLAB
SIMULATION[1].
II. Z-SOURCE INVERTER
Z-Source Inverters are used to overcome the limitations and
barriers of traditional Voltage Source Inverters and Current
Source Inverters[2]. Fig. 1 shows the Z source inverter
circuit diagram[5]. It consists of a unique impedance
network to link the inverter main circuit to the power
supply, load, or additional converter circuit, for providing
unique features that cannot be observed in the conventional
Voltage Source and Current Source Inverters in which a
capacitor and inductor are employed respectively. A split-
inductor L1 and L2 and capacitors C1 and C2 are cross
connected or connected in X shape is used to offer an
impedance source (Z-Source) pairing the inverter to the DC
supply, load, or additional converter. The DC supply or load
may be either a voltage source or a current source or it may
be the load. Therefore, the DC supply can be a battery,
diode rectifier, thyristor converter, an inductor, a capacitor,
or a arrangement of those. Switches employed in the
converter can be a arrangement of switching devices and
diodes like the antiparallel combination or the series
combination etc. The inductance L1 and L2 can be used as a
a split inductor or two separate inductors.
A. Circuit Diagram of Z-Source Inverter:
Fig. 1: Z- source inverter circuit diagram
III. FIELD ORIENTED CONTROL
This type of control is achieved,[4] Firstly, by converting
AC motor dynamics into dq synchronous frame under
certain conditions. Secondly, by aligning the flux of the
machine to the reference frame. Depending upon the
alignment of flux, the system categorized into two different
schemes.If the reference frame is aligned to the stator field
then it is called as stator field oriented control and if it is to
the rotor flux then referred as rotor field oriented scheme.
The decoupled control can be achieved by rotor
field oriented control like in separately excited DC machine.
However, calculation of the rotor flux is carried in two
different ways.
Direct Field Oriented Control (DFOC)
Indirect Field Oriented Control (IFOC)
A. Direct Field Oriented Control (DFOC)
If flux is measured directly by using sensors then it is called
Direct Field Oriented Control (DFOC). In direct field
oriented scheme, the rotor flux measures from hall effect
sensors. The installation of flux sensors is difficult due to
limitations of air gap space, armature reaction, noise, etc.
Due to these limitations the rotor flux is calculated indirectly
from stator currents that are measured using current sensors.
using the stator flux and currents ,and the second is from
slip information
IV. MATLAB SIMULATION OF CLOSED LOOP CONTROL OF
INDUCTION MOTOR:](https://image.slidesharecdn.com/ijsrdv3i100012-160107094046/85/Close-Loop-Control-of-Induction-Motor-Using-Z-Source-Inverter-1-320.jpg)
![Close Loop Control of Induction Motor Using Z-Source Inverter
(IJSRD/Vol. 3/Issue 10/2015/062)
All rights reserved by www.ijsrd.com 261
Fig. 2: Simulink model of closed loop control of induction motor
The rotor flux angle can be measured by integrating the
synchronous speed which is shown in eq.(1)
θ = = (1)
= slip speed in r/s
= rotor speed in r/s
From = we find id
s
which is used to generate
rotor flux
Where = rotor flux along d axis, = mutual
inductance, = stator current along d axis, =
rotor time constant stator current along q axis is
proportional to the slip. The two currents , are to be
used for the control of Induction machine[10].
V. SIMULATION RESULTS
The speed evaluated by field oriented control method or
vector control method is 160 r/s.When the motor starts its
speed increases gradually from zero speed and finally settles
down to a constant speed ie. 160 r/s speed /time graph
A. Torque Versus Time](https://image.slidesharecdn.com/ijsrdv3i100012-160107094046/85/Close-Loop-Control-of-Induction-Motor-Using-Z-Source-Inverter-2-320.jpg)
![Close Loop Control of Induction Motor Using Z-Source Inverter
(IJSRD/Vol. 3/Issue 10/2015/062)
All rights reserved by www.ijsrd.com 262
B. Stator Current /Time Graph
VI. CONCLUSION
Fast response of vector control compared to scalar control
make it better than other method of speed control of
induction motor, by using this method we achieve maximum
response in minimum time.
The vector control method or the d-q axes model
leads to a simpler analysis of an induction motor. A d-q axes
model with the d-axis aligned along the synchronously
rotating rotor frame, leads to the decoupled analysis where
the torque and the flux components can be independently
controlled just like in case of a dc motor.
Speed can be controlled by varying parameters of
motor, load torque, load limit value.
VII. FUTURE SCOPE
A new closed loop control of induction motor fed by a Z –
source inverter based on the vector control or field oriented
control strategy can be applied to the induction motors of
different ratings of desired application. A hardware model of
this proposed scheme can be implemented
REFERENCES
[1] Omar Ellabban, Joeri Van Mierlo and Philippe Lataire
„‟A new Closed Loop Speed Control of Induction
Motor Fed by A High Performance Z-Source Inverter‟‟
2010 IEEE Electrical Power & Energy Conference
978-1-4244-8188-0/10
[2] Fang Zheng Peng, “Z-Source Inverter”, IEEE
Transaction Industrial Application. Vol.-39, No.-2,
Page: 504-510, 2003
[3] Hiren M. Patel, Pankit T. Shah, Hemangini V. Patel
“Field Oriented Control of Induction Motor using
Matlab Simulink” Volume -01, Issue – 02, Nov. 10 to
Oct.11
[4] Sandeep Goyat , Rajesh Kr. Ahuja “Speed control of
induction motor using vector or field oriented control”
International Journal of Advances in Engineering &
Technology, July 2012
[5] Mohit Tyagi, Atul Kushwaha, Shubra Goel, Amit
Kumar, Manoj Saini„‟ Modelling and Simulation of
PWM based Z source inverter using Matlab/Simulink‟‟
IJEEE, Vol. No.6, Issue No. 02, July-Dec., 2014
[6] Habeeb Fatima, Dr. S. Tara Kalyani “Performance
Analysis of Z – source Inverter for Speed Control of
Induction Motor using Wind Energy Conversion
System” IJERT Vol.3 Issue 8 August- 2014 .
[7] Gopal K. Dubey, “Fundamental Of Electrical Drives”,
Narosa Publication House, Second Edition, 2011
[8] P. S. Bimbhra “ Power Electronics” Khanna Publishers
4th edition 2009
[9] P. S. Bimbhra “Generalized Theory of Electrical
Machine.](https://image.slidesharecdn.com/ijsrdv3i100012-160107094046/85/Close-Loop-Control-of-Induction-Motor-Using-Z-Source-Inverter-3-320.jpg)
Close Loop Control of Induction Motor Using Z-Source Inverter
- 1. IJSRD - International Journal for Scientific Research & Development| Vol. 3, Issue 10, 2015 | ISSN (online): 2321-0613 All rights reserved by www.ijsrd.com 260 Close Loop Control of Induction Motor Using Z-Source Inverter Vijay joshi1 Prof. Jitendra Singh Shakya2 1,2 Samrat Ashok Technological Institue, Vidisha (M.P) Abstract— In this paper a new closed loop control of induction motor fed by a Z – source inverter based on the vector control or field oriented control strategy is presented. Induction motor is supplied by Z – source inverter, in the Z – source inverter the term Z denotes impedance which means a combination of L & C element which are cross connected. The Z-source inverter consists of a unique impedance network (or circuit) to couple the inverter main circuit to the power supply, hence providing great features that cannot be observed in the conventional voltage-source inverter and current-source inverters in which capacitor and inductor are used, respectively.In the field oriented control method or vector control method speed of the induction motor, torque & 3 phase stator current is given to the field oriented controller and gate pulses for the inverter is generated to obtain the desired operation of the induction motor. Key words: FOC method, Z-source inverter, MATLAB simulation I. INTRODUCTION The main aim of this paper is the close loop control of Induction Motor by field oriented control (FOC) method using Z-source inverter. In this paper indirect field-oriented control (IFOC) method has been used to carry out the control the induction motor because of its simplicity. The close loop control of induction motor is carried out with the help of MATLAB SIMULATION[1]. II. Z-SOURCE INVERTER Z-Source Inverters are used to overcome the limitations and barriers of traditional Voltage Source Inverters and Current Source Inverters[2]. Fig. 1 shows the Z source inverter circuit diagram[5]. It consists of a unique impedance network to link the inverter main circuit to the power supply, load, or additional converter circuit, for providing unique features that cannot be observed in the conventional Voltage Source and Current Source Inverters in which a capacitor and inductor are employed respectively. A split- inductor L1 and L2 and capacitors C1 and C2 are cross connected or connected in X shape is used to offer an impedance source (Z-Source) pairing the inverter to the DC supply, load, or additional converter. The DC supply or load may be either a voltage source or a current source or it may be the load. Therefore, the DC supply can be a battery, diode rectifier, thyristor converter, an inductor, a capacitor, or a arrangement of those. Switches employed in the converter can be a arrangement of switching devices and diodes like the antiparallel combination or the series combination etc. The inductance L1 and L2 can be used as a a split inductor or two separate inductors. A. Circuit Diagram of Z-Source Inverter: Fig. 1: Z- source inverter circuit diagram III. FIELD ORIENTED CONTROL This type of control is achieved,[4] Firstly, by converting AC motor dynamics into dq synchronous frame under certain conditions. Secondly, by aligning the flux of the machine to the reference frame. Depending upon the alignment of flux, the system categorized into two different schemes.If the reference frame is aligned to the stator field then it is called as stator field oriented control and if it is to the rotor flux then referred as rotor field oriented scheme. The decoupled control can be achieved by rotor field oriented control like in separately excited DC machine. However, calculation of the rotor flux is carried in two different ways. Direct Field Oriented Control (DFOC) Indirect Field Oriented Control (IFOC) A. Direct Field Oriented Control (DFOC) If flux is measured directly by using sensors then it is called Direct Field Oriented Control (DFOC). In direct field oriented scheme, the rotor flux measures from hall effect sensors. The installation of flux sensors is difficult due to limitations of air gap space, armature reaction, noise, etc. Due to these limitations the rotor flux is calculated indirectly from stator currents that are measured using current sensors. using the stator flux and currents ,and the second is from slip information IV. MATLAB SIMULATION OF CLOSED LOOP CONTROL OF INDUCTION MOTOR:
- 2. Close Loop Control of Induction Motor Using Z-Source Inverter (IJSRD/Vol. 3/Issue 10/2015/062) All rights reserved by www.ijsrd.com 261 Fig. 2: Simulink model of closed loop control of induction motor The rotor flux angle can be measured by integrating the synchronous speed which is shown in eq.(1) θ = = (1) = slip speed in r/s = rotor speed in r/s From = we find id s which is used to generate rotor flux Where = rotor flux along d axis, = mutual inductance, = stator current along d axis, = rotor time constant stator current along q axis is proportional to the slip. The two currents , are to be used for the control of Induction machine[10]. V. SIMULATION RESULTS The speed evaluated by field oriented control method or vector control method is 160 r/s.When the motor starts its speed increases gradually from zero speed and finally settles down to a constant speed ie. 160 r/s speed /time graph A. Torque Versus Time
- 3. Close Loop Control of Induction Motor Using Z-Source Inverter (IJSRD/Vol. 3/Issue 10/2015/062) All rights reserved by www.ijsrd.com 262 B. Stator Current /Time Graph VI. CONCLUSION Fast response of vector control compared to scalar control make it better than other method of speed control of induction motor, by using this method we achieve maximum response in minimum time. The vector control method or the d-q axes model leads to a simpler analysis of an induction motor. A d-q axes model with the d-axis aligned along the synchronously rotating rotor frame, leads to the decoupled analysis where the torque and the flux components can be independently controlled just like in case of a dc motor. Speed can be controlled by varying parameters of motor, load torque, load limit value. VII. FUTURE SCOPE A new closed loop control of induction motor fed by a Z – source inverter based on the vector control or field oriented control strategy can be applied to the induction motors of different ratings of desired application. A hardware model of this proposed scheme can be implemented REFERENCES [1] Omar Ellabban, Joeri Van Mierlo and Philippe Lataire „‟A new Closed Loop Speed Control of Induction Motor Fed by A High Performance Z-Source Inverter‟‟ 2010 IEEE Electrical Power & Energy Conference 978-1-4244-8188-0/10 [2] Fang Zheng Peng, “Z-Source Inverter”, IEEE Transaction Industrial Application. Vol.-39, No.-2, Page: 504-510, 2003 [3] Hiren M. Patel, Pankit T. Shah, Hemangini V. Patel “Field Oriented Control of Induction Motor using Matlab Simulink” Volume -01, Issue – 02, Nov. 10 to Oct.11 [4] Sandeep Goyat , Rajesh Kr. Ahuja “Speed control of induction motor using vector or field oriented control” International Journal of Advances in Engineering & Technology, July 2012 [5] Mohit Tyagi, Atul Kushwaha, Shubra Goel, Amit Kumar, Manoj Saini„‟ Modelling and Simulation of PWM based Z source inverter using Matlab/Simulink‟‟ IJEEE, Vol. No.6, Issue No. 02, July-Dec., 2014 [6] Habeeb Fatima, Dr. S. Tara Kalyani “Performance Analysis of Z – source Inverter for Speed Control of Induction Motor using Wind Energy Conversion System” IJERT Vol.3 Issue 8 August- 2014 . [7] Gopal K. Dubey, “Fundamental Of Electrical Drives”, Narosa Publication House, Second Edition, 2011 [8] P. S. Bimbhra “ Power Electronics” Khanna Publishers 4th edition 2009 [9] P. S. Bimbhra “Generalized Theory of Electrical Machine.