svpwm 2 sem

8/13/2019 SVPWM 2 Sem

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Submitted by:

Shaik Afsar Ali (1604-09-734-017)Mohd Atifuddin Ansari (1604-09-734-018)Azad (1604-09-734-034)

8/13/2019 SVPWM 2 Sem


Sinusoidal PWM has been a very populartechnique used in AC motor control.

This relatively unsophisticated methodemploys a triangular carrier wavemodulated by a sine wave and the pointsof intersection determine the switchingpoints of the power devices in the inverter.

However, this method is unable to makefull use of the inverter’s supply voltageand the asymmetrical nature of the PWMswitching characteristics producesrelatively high harmonic distortion in the

supply.

8/13/2019 SVPWM 2 Sem


Space Vector PWM SVPWM) is a more

sophisticated technique for generating afundamental sine wave that provides a highervoltage to the motor and lower total harmonicdistortion (THD).

It is also compatible for use in vector control

(Field orientation) of AC motors. The project shall be made using a

programmed microcontroller of 8051 familyduly interfaced to 3 phase inverter with 6 no.sMOSFETs from DC derived from a singlephase, 50 Hz supply.

The load shall be a star connected threephase 50 Hz, 440volt, 0.5 to 1 HP motor.Alternatively a star lamp load can be used to

view the waveform only.

8/13/2019 SVPWM 2 Sem


8/13/2019 SVPWM 2 Sem


The 230V AC supply is first stepped down to12V AC using a step down transformer.

This is then converted to DC using bridgerectifier.

The AC ripples is filtered out by using acapacitor and given to the input pin ofvoltage regulator 7805.

At output pin of this regulator we get aconstant 5V DC which is used for MC andother ICs in this project.

8/13/2019 SVPWM 2 Sem


Opto coupler is a 6 pin IC. It is a

combination of 1 LED and a transistor. Pin 6 of transistor is not generally used

and when light falls on the Base-Emitter

junction then it switches and pin5 goes to zero.

If input of the diode is zero and other end of diodeis GND then the output is one.

When logic zero is given as input then the lightdoesn’t fall on transistor so it doesn’t conductwhich gives logic zero as output.

When logic 1 is given as input then light falls ontransistor so that it conducts, that makes transistorswitched ON and it forms short circuit this makesthe output is logic zero as collector of transistor

is connected to ground.

8/13/2019 SVPWM 2 Sem


FEATURES Floating channel designed for bootstrap

operation Fully operational to +600V Tolerant to negative transient voltage

dV/dt immune Gate drive supply range from 10 to 20V 3.3V, 5V, and 15V logic input

compatible

Matched propagation delay for bothchannels

Outputs in phase with inputs (IR2101)or out of phase with inputs (IR2102)

8/13/2019 SVPWM 2 Sem


DESCRIPTION

The IR2101(S)/IR2102(S) are high voltage,high speed power MOSFET and IGBT driverswith independent high and low sidereferenced output channels.

The output drivers feature a high pulsecurrent buffer stage designed for minimumdriver cross-conduction.

8/13/2019 SVPWM 2 Sem


8/13/2019 SVPWM 2 Sem


Definition :Space vector representation of a three-phase quantities xa(t),xb(t) and xc(t) with space distribution of 120o apart is given by:

x – can be a voltage, current or flux and does not necessarily has to besinusoidal

a = e j2/3 = cos(2/3) + j sin(2/3)a2 = e j4/3 = cos(4/3) + j sin(4/3)

)t(xa)t(ax)t(x32x c

2ba

Space Vector Modulation

8/13/2019 SVPWM 2 Sem


8/13/2019 SVPWM 2 Sem


The eight inverter voltage vectors (V0 to V7)

8/13/2019 SVPWM 2 Sem


The eight combinations, phase voltages and output line to linevoltages

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8/13/2019 SVPWM 2 Sem


Step 1. Determine Vd, Vq, Vref , andangle ()

Step 2. Determine time duration T1,T2, T0

Step 3. Determine the switching timeof each transistor (S1 to S6)

8/13/2019 SVPWM 2 Sem


Fig: Voltage Space Vector and its components in (d, q)

• Coordinate transformation: abc to d-q

8/13/2019 SVPWM 2 Sem



Reference voltage is sampled at regular interval, T

Within sampling period, vref is synthesized using adjacent vectorsand zero vectors

100V1

110V2

If T is sampling period,

V1 is applied for T1,

TT1V 1

V2 is applied for T2

T

T2V

2Zero voltage is applied forthe rest of the samplingperiod,

T0 = T T1 T2

Sector 1

8/13/2019 SVPWM 2 Sem



Reference voltage is sampled at regular interval, T

If T is sampling period,

V1 is applied for T1,

V2 is applied for T2

Zero voltage is applied forthe rest of the samplingperiod,

T0 = T T1 T2 T T

Vref is sampled Vref is sampled

V1

T1

V2

T2 T0/2

V0

T0/2

V7

va

vb

vc

Within sampling period, vref is synthesized using adjacent vectorsand zero vectors

8/13/2019 SVPWM 2 Sem



They are calculated based on volt-second integral of vref

dtvdtvdtvdtv

T

1dtv

T

1 721o T

07

T

02

T

01

T

00

T

0ref

772211ooref TvTvTvTvTv

0TT)60sin j60(cosV3

2TV3

20TTv 72

ood1doref

2

oo

d1dref T)60sin j60(cosV3

2TV

3

2Tv

How do we calculate T1, T2, T0 and T7?

8/13/2019 SVPWM 2 Sem



2

oo


2TV

3

2Tv

7,021 TTTT

100V1

110

V2

Sector 1

sin jcosvv ref ref

q

d

8/13/2019 SVPWM 2 Sem



Solving for T1, T2 and T0,7 gives:

sinT

3

1cos

3

Tm

2

3T1

sinmTT2

2

oo


2TV3

2Tv

2d1dref TV3

1TV

3

2cosvT

2dref TV3

1sinvT

where

3V

vm

d

ref

8/13/2019 SVPWM 2 Sem


Switching time duration at Sector 1

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Switching time duration at any Sector

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(a) Sector 1. (b) Sector 2.

(c) Sector 3. (d) Sector 4.

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(e) Sector 5. (f) Sector 6.

FIG: SPACE VECTOR PWM SWITCHING PATTERNS AT EACH

SECTOR

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SWITCHING TIME TABLE AT EACH SECTOR

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COMPONENT NAME QUANTITY Resistors 330R 1

10K 14

1K 6 2.2K 1 470R 6 33K 2 15K 4 47R 18 100R/2W 6 Capacitors 470uF/35V 2 10uF/63V 5 2.2uF/63V 3 33pF Ceramic 2 0.1uF (104) Ceramic 4 0.1uF/1000V 7 0.1uF (104)/400V 1 100uF/400V 4

8/13/2019 SVPWM 2 Sem


COMPONENT NAME QUANTITY Integrated Circuits 7805 1 AT89S52 1 MCT2E 6 IR2101 3 IC Bases 40 Pin BASE 1

06 Pin BASE 6 08 Pin BASE 3 Transistors IRF730 6 Diodes 1N4007 13 1N5408 4 1N4148 6 BA159 6 16V ZENER DIODE 6 RED-LED 4

COMPONENT NAME QUANTITY

8/13/2019 SVPWM 2 Sem


COMPONENT NAME QUANTITY

Miscellaneous

CRYSTAL 11.0592MHz 1

TRANSFORMER 0-12V 2

POWER CORD 1

HEAT SINK 1

SCREW NUT FOR HEAT SINK 1

MALE BERGE 2-PIN 2

FEMALE BERGE 2-PIN 2

2-PIN PUSH BUTTON 1

MALE RELIMET 8-PIN 2

MALE RELIMET 3-PIN 2

FEMALE RELEMENT TWO SIDED 3-PIN 1

FEMALE RELEMENT TWO SIDED 8-PIN 1

FUSE CARRIER 2FUSE ___ AMP 2

PCB CONNECTOR 3-PIN 4

100W BULB 1

100W BULB HOLDER 1

THREE PHASE MOTOR 1AC CONNECTOR 2-PIN 1

8/13/2019 SVPWM 2 Sem


svpwm 2 sem

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