sample paper_icpces 2010

8/10/2019 Sample Paper_ICPCES 2010

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Control of Three-level Active Power Filter

Using Modified Hysteresis Control Method1

Name of Author AMember IEEEand!

Name of Author " StudentMember IEEE,1#e$tt% of &lectrical &ngg% MNN'T Allaha(ad-!11))* 'ndia

!#e$tt% of &lectronics and Commn% &ngg% MNN'T Allaha(ad-!11))* 'ndia

+&mail, authoramnnit%ac%in%com author(gmail%com.%

Abstract-- 'n this $a$er a modified hysteresis controller (ased shunt active $ower filter is

$ro$osed% The voltage source converter +/0C. is o$erated using the $ro$osed modified

hysteresis current control method% The method $rovides fied switching fre2uency o$eration andthree-level P3M out$ut% The $ro$osed controller is yield the im$roved result as com$ared to the

conventional hysteresis control% The calculation of active $ower filter ratings and $ower loss

estimation has (een shown% The $erformance of the $ro$osed shunt active $ower filter isillustrated through the com$ensation of a distri(ution system using P0CA#4&MT#C simulation

studies%

Index Terms5Active $ower filter modified hysteresis controller switching fre2uency voltagesource inverter%

'% 'NT67#UCT'7N

6ecently there has (een increased use of shunt active $ower filters 819-8!9% Many methods are(ased on the P' controller tuned at the fre2uency to (e com$ensated% The use of $ro$ortional $lus

resonant controller $rovides the easy means to analy:e the dynamic $erformance of the current

control loo$% The use of hysteresis current control method has (een attem$ted for the two-levelcurrent control 8;9-89%

'n this $a$er the control of three-level shunt active $ower filter is $ro$osed using modifiedhysteresis current controller% The /0C is o$erated using hysteresis current control method% The

method $rovides varia(le switching fre2uency o$eration of the semiconductor switches of the

/0C% The uni$olar modulation of the control function $rovides the three-level P3M out$ut 8?9%This shifts the s$ectrum of the P3M out$ut to the twice the switching fre2uency 8@9% This

$rovides the unity $ower factor with (alanced source current and im$roved TH# +total harmonic

distortion.% 't is shown that the overall $erformance of the shunt com$ensated distri(ution systemcan (e $redicted using the linear analysis% The $erformance of the $ro$osed controller is

illustrated through the ;-$hase com$ensation of the distri(ution system using P0CA#4&MT#C

simulator%


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''% CA66'&6"A0TH6&&-&/&M7#UAT'7N

The three-level inverter out$ut is o(tained following the uni$olar P3M of the control function

as follows 8?9%

1) If err B vtri then Sw1is on and vAO D Vdc4!

elseif err Evtri then Sw*is on and vAO Vdc4!

0imilarly for other $hase leg ofH-(ridge

2) If err Bvtri then Sw;is on and vO D Vdc4!

elseif err Evtri then Sw2is on and vO Vdc4!

where err +iref is!. is the error function o(tained from reference shunt current is irefand the

actual shunt current is is!"

Fig%1 0hunt active $ower filter Fig%Two H-"ridge inverter

Fig%; Three-level modulation of H-(ridge inverter


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'''% M7#'F'HG0T&6&0'0C7NT67&6

For the reference shunt current is!refgenerated using the suita(le reference current generation

algorithm the hysteresis current controller follows the following control law%

u+t. D 1 f#r is!+t.E is!ref+t. +!D$. or e+t.B D +!D$. +1a.

u+t.% 1 f#r is!+t.B is!ref+t. D +!D$. or e+t.E +!D$. +1(.

u+t.% ) f#r is!+t.B is!ref+t. D $and is!+t.E is!ref+t. $ or $Ee+t.E D$ +1c.

where err +iref is!. is the error function o(tained from reference shunt current is irefand theactual shunt current is is!"The sym(ol 7I re$resents the mid $oint of the dc voltage Vdc% This

modulation method significantly reduces the ri$$les in control function% The detail will follow in

the full $a$er%

'/% 6 &0UT0AN##'0CU00'7N0

0witching dynamics of the single-$hase H-(ridge /0' is verified using P0CA#4&M#TC

simulation studies% The $arameters of the system are given in Ta(le '% The load considered isnonlinear and it is assumed that it draws the $redetermined fundamental and harmonic fre2uency

content% The load is assumed to draw the following current%

Ta(le '

0ystem $arameters for single-$hase distri(ution system and com$ensator%

Parameters Numerical value

0ource voltage vs !))%) / +rms.

0ystem fre2uencyf# =) H:%

Feeder im$edance&s

's

Negligi(le

0hunt im$edance&T'T !%) mH ;%)

#C linJ voltage Vdc ?))%) /

'n this $a$er load is taJen for simulation is the ;-$hase diode (ridge rectifier su$$lyingresistive and inductive load% The linear load connected is un(alanced% Three-$hase load current is

shown in Fig%* this constitutes the total TH# of ;;K% The maLor distorting harmonic com$onents

are th% The currents are also un(alanced%

Fig%* Three $hase load current Fig%< Com$ensated source currents


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The com$ensated (alanced source current using the $ro$osed controller is shown in Fig% TracJing of reference shunt current

The tracJing of the reference shunt current is shown in Fig%>% The reference is generated

using the algorithm given in 8=9-8>9% The algorithm also includes the method to control the dc

voltage across the dc-linJ ca$acitor%

/% C7NCU0'7N0

The results for the new controller are verified through simulations and e$eriments and it is

concluded that the source current (ecomes linear and also total harmonic distortion in sourcecurrent is im$roved to !%1K (y using this modified hysteresis controller%%

/'% ACN73&M&NT

N7T&, 't may (e noted that the content $resent in this $a$er is $urely a sam$le in nature% 'tmay (e only used for formatting the $a$er for the su(mission of digest to 'CPC&0 !)1)

scheduled to (e held on Nov% !@-#ec% )1 !)1) at MNN'T Allaha(ad% The resem(lance of this

$a$er should not (e made to any $u(lished or un$u(lished worJ%

6&F&6&NC&0

819 Oih-0heng ai eonard eslie Oeremy Ferrel Troy Nergaard Characteri:ation of H/-'"T

for High-Power inverter a$$licationsQ (#nf" 'ec" #f IEEEIAS, 2**+ vol%1 $$%;>>-;?!%8!9 O% Allmeling A control structure for fast harmonics com$ensation in active filtersQ IEEE

Trans" #wer Electr", vol%1@ no%! $$%9 A% hosh and % edwich oad Com$ensating #0TATC7M in weaJ AC systemsQ IEEE

Trans" #wer eliver/ vol% 1? No% * $$% 1;)!-1;)@ 7ct% !));%

8?9 N% Mohan T% M% Undeland and 3% P% 6o((ins #wer Electr#nics, (#nverters, A--licati#ns

and esi0nQ 0inga$ore Oohn 3iley S 0ons 'nc% 1@?@ Cha$ter =%

8@9 #% % Holmes and T% A% i$o ulse idt! M#dulati#n 3#r #wer (#nvertersQ A Oohn

3ieley S 0ons 'nc% '&&& $ress Piscataway NO !)); Cha$ter 11%


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81)9 0riJanthan 0% Mahesh % Mishra Constant fre2uency current control using a ram$

com$arison method for a #0TATC7M a$$lication%

8119 0% "ernet 6% Teichmann A% RuJer(erger P% 0teimer Com$arison of high $ower '"Tsand hard driven T7s for high $ower 'nvertersQ (#nf" r#c" AE(1445 vol-! $$%>11-

>1?%

81!9 uigi Malesani $aolo Tomasin P3M current control techni2ues of voltage sourceconverters A 0urveyQ (#nf" r#c" #f IE(O6748 vol%! $$% =>)-=>

sample paper_icpces 2010

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