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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)
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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.
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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.
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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.
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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.
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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)
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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.
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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
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The eight inverter voltage vectors (V0 to V7)
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The eight combinations, phase voltages and output line to linevoltages
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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)
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Fig: Voltage Space Vector and its components in (d, q)
• Coordinate transformation: abc to d-q
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Space Vector Modulation
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
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Space Vector Modulation
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
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Space Vector Modulation
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?
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Space Vector Modulation
2
oo
d1dref T)60sin j60(cosV3
2TV
3
2Tv
7,021 TTTT
100V1
110
V2
Sector 1
sin jcosvv ref ref
q
d
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Space Vector Modulation
Solving for T1, T2 and T0,7 gives:
sinT
3
1cos
3
Tm
2
3T1
sinmTT2
2
oo
d1dref T)60sin j60(cosV3
2TV3
2Tv
2d1dref TV3
1TV
3
2cosvT
2dref TV3
1sinvT
where
3V
vm
d
ref
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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
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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
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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
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