Matrix Converter based Direct Torque Control of Induction Motor

PSG COLLEGE OF TECHNOLOGY
ME – Power Electronics & Drives
Dept. of EEE
Matrix Converter Based Direct
Torque Control Of Induction
Motor
By:Neehar N.L.N
Guide:Mrs.P.Sweety Jose

Dept. of EEE
 The direct torque control (DTC) scheme for a matrix-
converter-fed induction motor drive system is a high
performance motor control scheme with fast torque
and flux responses. By selecting appropriate
switching patterns, the advantages of DTC and
benefits of matrix converters can be combined to
achieve a satisfactory servo drive.
Matrix Converter based DTC
ABSTRACT
NEEHAR NLN [12MQ36] 16/07/2013 2

Dept. of EEE
 Over the years, there have been many advancements
in the field of induction motor control.
 The main disadvantage of scalar control is poor
dynamic response or sluggish response which is
due to the inherent coupling effect between Torque
and flux components.
 This led to development of vector control wherein
the torque and flux components are decoupled so that
both can be controlled independently.
INTRODUCTION
NEEHAR NLN [12MQ36] 16/07/2013 3

Dept. of EEE
Direct Torque Control(DTC):
NEEHAR NLN [12MQ36] 16/07/2013 4

Dept. of EEE
Comparison property DTC FOC
Dynamic response to torque Very fast Fast
Coordinates reference frame alpha, beta (stator) d, q (rotor)
Low speed (< 5% of nominal) behavior
Requires speed sensor for continuous
braking
Good with position or speed sensor
Controlled variables torque & stator flux
rotor flux, torque current iq & rotor flux
current id vector components
Steady-state torque/current/flux ripple &
distortion
Low (requires high quality current
sensors)
Low
Parameter sensitivity, sensorless Stator resistance d, q inductances, rotor resistance
Parameter sensitivity, closed-loop
d, q inductances, flux (near zero speed
only)
d, q inductances, rotor resistance
Rotor position measurement Not required Required (either sensor or estimation)
Current control Not required Required
PWM modulator Not required Required
Coordinate transformations Not required Required
Switching frequency Varies widely around average frequency Constant
Switching losses
Lower (requires high quality current
sensors)
Low
Audible noise spread spectrum sizzling noise constant frequency whistling noise
Control tuning loops speed (PID control)
speed (PID control), rotor flux control (PI),
id and iq current controls (PI)
Complexity/processing requirements Lower Higher
Typical control cycle time 10-30 microseconds 100-500 microseconds
NEEHAR NLN [12MQ36] 16/07/2013 5Matrix Converter based DTC

Dept. of EEE
Desired features in
frequency changers:
 Simple and compact power circuit.
 Sinusoidal input and output currents.
 Operation with unity power factor for any load.

Dept. of EEE
Matrix Converter:
 It is a forced commutated converter which uses an
array of bidirectional switches as the main power
elements to create a variable output voltage system
with unrestricted frequency.
 It has an array of mxn bidirectional switches
connecting m-phase source voltage source to a n-
phase load.
 Converter of 3x3 switches has the highest practical
interest because it connects a three-phase voltage
source with three-phase load, typically a motor.

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Circuit of matrix converter:

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Block diagram:

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Losses comparison:

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Bidirectional switches:

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Commutation circuit:

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Mathematical Model:

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State table:

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Direct method:

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Indirect approach:

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Rectifier states:

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Inverter states:

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Maximum output-input ratio:

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Space vector modulation
Output voltage vectors:

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Simulink Model:

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Simulation Results:
Output Voltage and Current waveforms

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MC based DTC:
2 HP, 400 V, 50 Hz Squirrel Cage Induction Motor with following parameters:
Stator Resistance and Inductance: 5 Ohms and 0.03230 H
Rotor Resistance and Inductance: 4.861 Ohms and 0.03230 H
Mutual Inductance : 0.4088 H

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Switching table:

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Simulation Results:
Load Current:

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Speed waveform:

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References:
 Electric Motor Drives by Vedam Subramaniam.
 Fundamentals of Electrical Drives by Gopal.K.Dubey.
 High power converters and AC Drives-BinWu,IEEE Press.
 Matrix Converters: A technological review-P.W.Wheeler,
J.Rodriguez,J. Clare, L.Empringham and A.Weinstein.IEEE
Transactions on Industrial Electronics,Vol. 49, No. 2,April
2002.
 Direct Torque Control of Matrix Converter Fed Induction
Motor Drive: A Review-R.A.Gupta,Virendra Sangtani, Ajay
Kumar Bansal.Proc. Of Intl. Conf. on Advances in
Computer,Electronics and Electrical Engineering,2012.

Dept. of EEE
Contd.
 Alesina A. and Venturini M.G.B.,”Analysis and design of
Optimum Amplitude nine-switch direct AC-AC Converters”
,IEEE Transactions on Power Electronics Vol. 4. NO.1.,january
1989,pp101-112.
 Modeling,Analysis and simulation of matrix
converters,J.Rodriguez,E.Silva,R.Burgos,F.Blaabjerk-
Universidad Tecnica Federico Santa Mari,Valparaiso,Chile.
 Modelling,Simulation and Analysis of Matrix Converter using
Matlab and Simulink-Hulusi Karaca and Ramazan Akkaya-
International Journal of Modeling and Optimization,Vol.2,No.
3,June 2012.

Dept. of EEE
Thank You

Matrix Converter based Direct Torque Control of Induction Motor

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