Dsp Controlled Inverter Fed
Transcript of Dsp Controlled Inverter Fed
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DSP CONTROLLDSP CONTROLL
INDUCTION INDUCTION
``
D INVERTER FEDD INVERTER FED
OTOR DRIVE OTOR DRIVE
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ABSTABSTA Complete production unit consists pri
electric motor ,an energy transmitting de
Availability of self commutating power seGTO have allowed the development of vafor industrial and traction application.
VVVF control of induction motor can be o
controlled by mens of DSP processor T
TMS320F240 is capable of executing of 2meets the requirement of an enhanced m
Presently , IGBT is the most preferred swinverter from few KW to several MW.
High clock speed and advanced architectControl algorithm and minimization of cachieving high dynamic performance.
R
ACTRACTarily of three basic components: an
ice and the driven machine.
miconductor devices like,IGBT andiable speed induction motor drives
btained form a voltage source inverter
S320F240.
million instruction per second andtor control system.
itching device for voltage source
ure helps in executing complex motor ontrol loop delays and thereby helps in
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PROJECT
Study of VVVF operation
Operation of pulse widtsource inverter
Space vector algorithm.
Real time control prograpulse pattern by TMS32vector control algorithm
Testing of inverter fed in
I
NVOLVES
of drive
modulated voltage
m for generation of PWMF240 (based on space.
duction motor drive.
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Variable volt
frequency
ge &variable
operation
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VVVF o
1. when the frequency and hence also the
voltages are low, the voltage drop across
the stator resistance cannot be neglected
2. At frequency higher than the rated value
the constant v/f principal is to be violated.3. Hence the stator flux is maintained
constant, independent of the change in
supply frequency, the torque developed
depends on the slip speed only.
eration:
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INVE
Inverters used in VVVF operatio
1. Six step inverter: A step is defined
to the next thyris360degree, each
six-step inverter.
2.Pulse width modulation inverters:
TERS
:
as a change in the firing from one thyristor
or in a proper sequence. For one cycle of step would be of 60degree interval for a
PWM techniques are characterised by
constant amplitude pulses . The width of
these pulses is modulated to obtainobtain inverter output voltage control to
reduce its harmonics.
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PULSE WIDTH MOD
Single pulse width mod Multiple pulse width m
Sinusoidal pulse width
Phase displacement co
ULATED INVERTERS
ulationodulation
odulation
trol
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SPACE VECTOR MODULATION
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SWITICHIN PATTERN
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Switching
Sector number On-
1 8-1-2 8-3-
3 8-3-
4 8-5-
5 8-5-
6 8-1-
sequence
equence Off-sequence
2-7 7-2-1-82-7 7-2-1-8
4-7 7-4-3-8
4-7 7-4-5-8
6-7 7-6-5-8
6-7 7-6-1-8
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DSP ARC ITECTURE
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DSP CONTROLLED INV
MOTOR BLO
RTER FED INDUCTION
K DIAGRAM
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OPEN LOOP CONFIGURAT
INDUCTION MOTOR DRIVE
ALGO
ION OF DSP CONTROLLED
(BASED ON SPACE VECTOR
ITHM)
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CONC
The DSP controller TMS320F2a DSP architecture with the opcontroller in a single chip soluWith the DSP controller an int
possible to reduce the overallreliability of the drive system.
USION
0 combines the performance of timized peripherals of micro-ion of an induction motor .lligent control approach is
system cost and to improve the
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ANY Q RIES ?
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THANK YOU