Oxford Engg PPT

7/29/2019 Oxford Engg PPT

1/47

Introduction Global share of PV increased

by 165% from 2010

Potential for tremendous

increase in Indias contribution Favorable national and state

policies

Introduction

Importance of Front-

End Converters

Conventional boost

converter

Methods to obtain

high gain (>10)

Multi-level DC-DC

Boost Converter

Interleaved Voltage

Multiplier Cell (VMC)

based Boost Converter

Summary

1

Power Converters for

PV Applications

Dr.M.Prabhakar,

VIT University,

Chennai.


2/47

Importance of Front-End

Converters Incremental losses due to use of

transformer.

Bulky and more device count.

Chances of compromise in output

power quality. Excessive voltage and current

stresses on power switches due to

presence of only one stage.

2

Introduction


End Converters

Conventional boost

converter

Methods to obtain

high gain (>10)

Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary


PV Applications

Dr.M.Prabhakar,

VIT University,

Chennai.


3/47

Voltage gain = 1/(1-D)

1V/2V, 1W, 10kHz Boost

converter is simulated

L1, C1, designed using standard

equations

3

Introduction


End Converters

Conventional boost

converter

Methods to obtain

high gain (>10)

Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary


PV Applications

Dr.M.Prabhakar,

VIT University,

Chennai.


4/47

4

Introduction


End Converters

Conventional boost

converter

Methods to obtain

high gain (>10)

Multi-level DC-DC

Boost Converter

Interleaved VoltageMultiplier Cell (VMC)


Summary


PV Applications

Dr.M.Prabhakar,

VIT University,

Chennai.

Average output close to designed

value


5/47

5

Introduction


End Converters

Conventional boost

converter

Methods to obtain

high gain (>10)

Multi-level DC-DC

Boost Converter



Summary


PV Applications

Dr.M.Prabhakar,

VIT University,

Chennai.

Peak device voltage stress 1.5times output


6/47

6

Introduction


End Converters

Conventional boost

converter

Methods to obtainhigh gain (>10)

Multi-level DC-DC

Boost Converter



Summary


PV Applications

Dr.M.Prabhakar,

VIT University,

Chennai.

As power (double), outputgets ( half)


7/47

7

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter



Summary


PV Applications

Dr.M.Prabhakar,

VIT University,

Chennai.

Power loss across the switch is veryhigh


8/47

8

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter



Summary


PV Applications

Dr.M.Prabhakar,VIT University,

Chennai.

Higher voltage stress on the

switch

Higher power loss in the

switch

High gain, high power

applications - Low turn on and turn off time

chances for diode reverseproblem


9/47

9

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter



Summary


PV Applications


Chennai.

Multilevel/Cascaded Converters

Interleaved boost converter

Voltage multiplier CellCoupled Inductor, Fly back

Voltage Doubler

Switched Capacitor

Active Clamped Circuit


10/47

10

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter



Summary


PV Applications


Chennai.


11/47

11

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter



Summary


PV Applications


Chennai.

Design Details

Voltage Gain =

Specifications:

Input=12V

Output=230V

Power=200W Inductance=700H

Capacitance=100F

Switching Frequency=50kHz

1

N

D


12/47

12

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter



Summary


PV Applications


Chennai.


13/47

13

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter



Summary


PV Applications


Chennai.


14/47

14

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter



Summary


PV Applications


Chennai.


15/47

15

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter



Summary


PV Applications


Chennai.


16/47

16

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter



Summary


PV Applications


Chennai.


17/47

17

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter



Summary


PV Applications


Chennai.


18/47

18

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter



Summary


PV Applications


Chennai.


19/47

19

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter



Summary


PV Applications


Chennai.

Voltage Multiplier Cell (VMC)


20/47

20

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter



Summary


PV Applications


Chennai.

Voltage gain =

Specifications:

Vin= 12 V, Vout = 100 V

Output Power = 100 WFrequency = 50 kHz

Duty Cycle = 0.75N = 1

1

1

N

D

+


21/47

21

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter



Summary


PV Applications


Chennai.


22/47

22

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary


PV Applications


Chennai.


23/47

23

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary


PV Applications


Chennai.


24/47

24

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary


PV Applications


Chennai.


25/47

25

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary


PV Applications


Chennai.


26/47

26

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary


PV Applications


Chennai.


27/47

27

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary


PV Applications


Chennai.


28/47

28

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary


PV Applications


Chennai.

Element Loss in wattsExisting Proposed

Switch

conduction 1.58 0.814

Turn-on 0.435 0.470

Turn-off 0.625 1.8Diodes 3.6 1.016

Inductor 1 0.6

Total 7.24 4.7


29/47

29

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary


PV Applications


Chennai.


30/47

30

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary


PV Applications


Chennai.

Interleaved Boost Converter with

VMC


31/47

31

Introduction


End Converters

Conventional boost

converter

Methods to obtain

high gain (>10)

Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary


PV Applications


Chennai.

Voltage gain

Specifications:

Vin= 12 V, Vout = 230 V

Output Power = 350 W

Frequency = 100 kHz

Duty Cycle = 0.5


32/47

32

Introduction


End Converters

Conventional boost

converter

Methods to obtain

high gain (>10)

Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary


PV Applications


Chennai.


33/47

f


34/47

34

Introduction


End Converters

Conventional boost

converter

Methods to obtain

high gain (>10)

Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary


PV Applications


Chennai.

N=3,

D=0.6842

N=4,D=0.5789

P C f


35/47

35

Introduction


End Converters

Conventional boost

converter

Methods to obtain

high gain (>10)

Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary


PV Applications


Chennai.

P C t f


36/47

36

Introduction


End Converters

Conventional boost

converter

Methods to obtain

high gain (>10)

Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary


PV Applications


Chennai.



37/47

37

Introduction


End Converters

Conventional boost

converter

Methods to obtain

high gain (>10)

Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary


PV Applications


Chennai.

Inferences

High gain (>10) can be achieved

by suitably designing coupled

inductor and VMC Switch stress is very less

Limitation on duty cycle and

no. of turns (N)

For high power application

(>1kW), design has to besuitably changed



38/47

38

Introduction


End Converters

Conventional boost

converter

Methods to obtain

high gain (>10)

Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary


PV Applications


Chennai.

Coupled Inductor Based Boost

Converter

Power Converters for D i


39/47

39

Introduction


End Converters

Conventional boost

converter

Methods to obtain

high gain (>10)

Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary


PV Applications


Chennai. 2

1

nn

D

++

Design

Voltage gain is given by

where n = no. of turns

Specifications

Vin = 12 V, Vout= 200 V

Output Power = 200 W, n = 3

Switching Frequency = 50kHz



40/47

40

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary


PV Applications


Chennai.



41/47

41

Introduction


End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary


PV Applications


Chennai.



42/47

42

Introduction

Importance of Front-End Converters

Conventional boost

converter


Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary


PV Applications


Chennai.



43/47

43

Introduction


Conventional boost

converter


Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary


PV Applications


Chennai.


44/47



45/47

45

Introduction


Conventional boost

converter


Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary

PV Applications


Chennai.

Power Converters for Summary


46/47

46

Introduction


Conventional boost

converter


Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary

PV Applications


Chennai.

Summary

Number of levels in a multi-levelboost converter can be increased

No. of VMC units can be

increased to achieve higheroutput power

Turns ratio of coupled inductor

can be adjusted judiciously Hybrid topologies (combination

of one or more) may besynthesized



47/47

47

Introduction


Conventional boost

converter


Multi-level DC-DC

Boost Converter

Interleaved Voltage



Summary

PV Applications


Chennai.

Thank You

Oxford Engg PPT

Documents