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The 27-Level Multilevel Inverterfor Solar PV Applications

Presentation by,

T.Anan!u"ar.

M# $P#%& ' I (ear

120/10/2015

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CONTENTS

• Introduction

• Modeling of Multi level Inverters

• 27 Stage Multilevel Inverter Proposed System

• Woring principle of !"p# 27 level Inverter 

• S$itc#ing Mode of operation

• S$itc#ing Tec#ni%ue Multi &evel Inverter 

• Inverter Efficiency

• Conclusions

• 'eferences

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()ST'(CT

• Several advantages compared to t#eir

conventional counterparts*

• Provides Stepped (C voltage $ave form $it#

lesser #armonics

• )y increasing Step levels t#e filter

components are reduced

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INT'O+,CTION

• Multilevel inverters are used in #ig# po$er

applications *

• Increasing t#e num-er of +C voltage Sources at

different range

•  Need of filters is reduced -y increasing t#e voltage

level

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• Eac# solar array provides different +C voltage

levels*

• In #ig# po$er applications. Cascaded inverter

can easily interface $it# Solar P/ module and

fuel cells

• 0ull -ridge modules #aving t#e relations#ip of

1v. !v. v3**!s"1v for +C lin /oltage

Continued3

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SIN4&E P5(SE M,&TI&E/E& 5"

)'I+4E IN/E'TE' 

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MO+E&IN4 O0 M,&TI &E/E&

IN/E'TE'S

• 0or eac# full -ridge inverter t#e output voltage

/oi 6 /dc S1i"S2i8 

/oi " Output /oltage

  /dc " Input /oltage

  S1i and S2i " upper s$itc# of 

  eac# inverter 20/10/2015 7

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• 0or eac# full -ridge inverter t#e output Current

Idci 6 Ia S1i"S2i8

 

Io " Output current

  Idci " Current at eac# cell

 

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27 ST(4E M,&TI&E/E& IN/E'TE'

P'OPOSE+ S9STEM

• T#e inverter uses a standard t#ree"leg and an

5"-ridge $it# its +C source

• It #as t#ree voltage sources as an input to t#e

t#ree 5")ridges

• Eac# 5"-ridge #as a Semiconductor s$itc#es

lie I4)T or MOS0ET

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Continued3

• T$o semiconductors are s$itc#ed for one #alf

cycles

• T#e s$itc#ing for one positive cycle is as S1.

S: and S;. S< and S. S12

• Connecting t#e modules in series increase t#e

level to o-tain sinusoidal $aveform

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27 &evel Multilevel Inverter P/ Panel (rray

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WO'=IN4 P'INCIP&E O0 !"P5 27

&E/E& IN/E'TE' 

• T#e inverter uses a standard t#ree"leg inverter 

• 5"-ridge $it# its +C source in series $it# eac# p#ase leg

• Output voltage >1 !v8 of t#is first leg is goes to ON state

• 0or a negative #alf cycle t#is leg is connected in series$it# a full 5"-ridge

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Single p#ase of t#e 27 level Multilevel

inverter 

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SWITC5IN4 MO+E O0 OPE'(TION

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SWITC5IN4 TEC5NI?,E M,&TI

&E/E& IN/E'TE' 

• Several inds of modulation control met#ods

are t#ere

1* Traditional pulse $idt# modulation

2* Space vector PWM

!* 5armonic optimi@ation:* (ctive #armonic elimination

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Continued3

• Sinusoidal pulse $idt# modulation SPWM8

s$itc#ing sc#eme is used

• 0ourier series eApansion of t#e fundamental

fre%uency

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O,TP,T W(/E0O'M

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IN/E'TE' E00ICIENC9

• Cascaded #y-rid inverter efficiency is #ig#er

for t#e applications

• S$itc#ing losses are -igger t#an a

conventional inverter

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SE&ECTION O0 /O&T(4E SO,'CES

(N+ ST(4ES

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CONC&,SIONS

• 5armonics $as !B in EAisting system

• +ramatically reduces t#e lo$er order #armonics of

!rd. ;t#. ,p to 1!t#

• Total 5armonics +istortion of !*B:

• ProDect can -e eAtended up to <1"level multilevel

inverter *

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'E0E'ENCES

• [1] K. M. Rahman, N. R. Patel, T. G. Wa!, ". M. Na#a$h%ma, &.'a%((h%,an! &.'e$(%m)%n%, *+l%(at%-n - !%e(t!%e heel m-t- - el (ell ele(t%( an! h)%!ele(t%( eh%(le -l$%-n $$tem, Tan$. n!.+l., -l. 42, n-. 5, . 11851192, e/(t. 2006.

• [2] ". . :a% an! &. ;. Pen#, *Mlt%leel (-nete$ + ne )ee! - -e (-nete$, Tan$ n!. +l., -l. 32, n-. 3, . 3644, Ma/"n.1996.

• [3] :. M. T-l)et, &. ;. Pen#, T. G. <a)etle,*Mlt%leel (-nete$ - la#e ele(t%(!%e$, Tan$a(t%-n$ -n n!$t +l%(at%-n$, -l.35, n-.1, "an /&e). 1999, .3644.

• [4] ". . :a% an! &. ;. Pen#, *Mlt%leel (-nete$ + ne )ee! - -e (-nete$, Tan$a(t%-n$ -n n!$t +l%(at%-n$, -l. 31, n-.3, Ma./"ne 1997, . 509517.

• [5] ". R-!=#e>, ". :a%, an! &. Pen#, *Mlt%leel %nete$? a $e - t--l-#%e$,(-nt-l$ an! al%(at%-n$, Tan$a(t%-n$ -n n!$t +l%(at%-n$, -l. 49, n-. 4,

+#. 2002, . 724738.• [6] . n-!a, +. ma!%, *PM)a$e! m-!el%n# - +t- m-t%e -e $$tem$?

(-nent%-nal, ele(t%(, an! h)%! ele(t%( eh%(le$ Tan$a(t%-n$ -n @eh%(la Te(hn-l-#, -l. 53, %$$e 2, 2004,. 390395.

• [7] A.;h-n#, B.>%ne(%, :. M. T-l)et, ". N. 'h%a$$-n, *n!(t- le$$ A'+' (a$(a!e!<B%!#e mlt%leel )--$t %nete - le(t%(/h)%! ele(t%( eh%(le al%(at%-n$, n!$t +l%(at%-n$ '-neen(e, et. 2007, . 603608.

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T#an 9ou

2220/10/2015