dsp controlled inverter fed

8/9/2019 Dsp Controlled Inverter Fed

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DSP CONTROLLDSP CONTROLL

INDUCTION INDUCTION

``

D INVERTER FEDD INVERTER FED

OTOR DRIVE OTOR DRIVE



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



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.



Variable volt

frequency

ge &variable

operation



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:



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.



PULSE WIDTH MOD

Single pulse width mod Multiple pulse width m

Sinusoidal pulse width

Phase displacement co

ULATED INVERTERS

ulationodulation

odulation

trol



SPACE VECTOR MODULATION



SWITICHIN PATTERN



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



DSP ARC ITECTURE



DSP CONTROLLED INV

MOTOR BLO

RTER FED INDUCTION

K DIAGRAM



OPEN LOOP CONFIGURAT

INDUCTION MOTOR DRIVE

ALGO

ION OF DSP CONTROLLED

(BASED ON SPACE VECTOR

ITHM)



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



ANY Q RIES ?



THANK YOU

dsp controlled inverter fed

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