Power quality improvement using unified power quality conditioner | Power Inverter | Ac Power

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Volume -1 ,Issue -2, Feb-2017
    ISSN (Online) No: INTERNATIONAL JOURNAL OF RESEARCHREVIEW IN ENGINEERING AND MANAGEMENT(IJRREM) POWER QUALITY IMPROVEMENT USING UNIFIED POWER QUALITY CONDITIONER  DHILNA T PG Scholar, Department of EEE,Adhiyamaan College of Engineering,Hosur - 63! #, $amilnadu, %ndia& dhilna1992! ail#$% NARAYANAPPA#S  Professor  & Department of EEE,Adhiyamaan College of Engineering,Hosur - 63! #, $amilnadu, %ndia& na'a(an)'a*a+al! ail#$% A,-.'a$. 'or economic operation of po(er system the le)el of po(er *uality should +e properly maintained& $his paper deals (ith a nified Po(er uality   Conditioner .PC/ for current and )oltage pertur+ations compensation   in a po(er distri+utionnet(or0& $he system proposes P% controller for series in)erter and hysteresis currentcontroller for shunt in)erter& $he performance of PC is implemented in1A$2A4Simulin0 and simulations results are o+tained   depicting the po(er *ualityimpro)ement in the   system&  Keywords  - Custom Power Device, voltage sag, voltage swell, Total harmonicdistortion ,UPQC  I# INTRODUCTION   $he gro(ing use of po(er electronic e*uipment has made us to focus on po(er *uality& 5o(adays, due to proliferation of )oltage-sensiti)e load e*uipment inindustrial sector industrial processes are much more affected (ith the degradation inthe *uality of po(er supply& oltage sag is )ery ha7ardous to control4digitale*uipment in process industry& A PC is a Custom Po(er De)ice .CPD/ used as themost cost effecti)e acti)e solution for )oltage sag mitigation as (ell as current related pertur+ations& In [1] the author presents a simplifed control algorithm o athree-phase Series Active Power Filter as Power Qualit!onditioner SAPF# compensates suppl voltage un$alance andharmonics in such a wa that the do not reach the load endresulting in low %&' at the load voltage( %he series APF is reali)edusing a three phase* three leg voltage source inverter ( In [+] International ,ournal o esearch eview in .ngineering and /anagement I,./# 0olume -1* Issue -+* Fe$ -+12 Page 3o4 56-7Page    ISSN (Online) No: INTERNATIONAL JOURNAL OF RESEARCHREVIEW IN ENGINEERING AND MANAGEMENT(IJRREM) authors descri$es the 'namic 0oltage estorer '0#* its unctions*confgurations* components* operating modes* voltage in8ectionmethods and closed-loop control o the '0 output voltage alongwith the device capa$ilities and limitations( In [5] discusses thevarious control algorithms o 'S%A%!9/( %he manner in which thepower :ualit issues are mitigated $ the converter are alsoe;plored(   In [6] proposed reactive power control theor or three-phase sstems with or without neutral wire* and it is valid or $othstead state and transients( In [<] the authors also e;plained the phsical meaning o instantaneous reactive power and proposed instantaneous reactivepower compensator comprising switching device without energstorage was proposed(   %n [=] authors suggests a new controlmethod to compensate the power :ualit pro$lems through a three-phase >nifed Power Qualit !onditioner >PQ!# under non-idealmains voltage and un$alanced load conditions( %he perormance o proposed control sstem was anal)ed( %he proposed >PQ! sstemcan improve the power :ualit at the Point o !ommon !oupling P!!# on power distri$ution sstem under non-ideal mains voltageand un$alanced load conditions( In [2] authors modelled a >PQ! or$oth active and reactive power compensation using di?erent controlstrategies( %he $ehaviour o >PQ! has $een anal)ed with suddenswitching o -@ loads* and -! loads as well as occurrences o di?erent shunt aults( %he control scheme has $een devised using PIcontroller in >PQ! or real and reactive power control* and operationin case o switching and aults in transmission sstems(   In this proposed sstem* >PQ! consists o two voltage-sourceinverters with a common dc lin designed in three phase our-wireconfgurations( 9ne inverter is controlled as a varia$le voltagesource in the series Active Power Filter ( %he other inverter iscontrolled as a varia$le current source in the shunt Active PowerFilter ( %he series APF compensates or voltage suppldistur$ances (%he shunt APF converter compensates or load currentdistortions and reactive power* and perorm the dc lin voltageregulation( $he series capacitor ena+les reduction in DC-lin0 )oltage re*uirementof the shunt acti)e filter and simultaneously compensating the reacti)e po(er re*uired +y the load, so as to maintain unity po(er factor, (ithout compromising its performance& $he simulation studies are carried out using 1A$2A and detailedresults are presented in the paper& II# PROPOSED SYSTEM CONFIGURATION International ,ournal o esearch eview in .ngineering and /anagement I,./# 0olume -1* Issue -+* Fe$ -+12 Page 3o4 56-7Page    ISSN (Online) No: INTERNATIONAL JOURNAL OF RESEARCHREVIEW IN ENGINEERING AND MANAGEMENT(IJRREM) $he PC is a hy+rid AP' (hich can mitigate )oltage and current related po(er *uality pro+lems simultaneously . PC consists of 8 %G$ +ased S%, one shunt and one seriescascaded +y a common dc +us& $he shunt in)erter is connected in parallel (ith the load&  %heoutput current o shunt converter is ad8usted using a dnamic hsteresis$and $ controlling the status o the semiconductor switches such thatoutput current ollows the reerence signal and remains in apredetermined hsteresis $and( $he series in)erter is connected in series withA! line through a series transormer and acts as a voltage source tomitigate voltage distortions $ in9ecting suita+le )oltage (hene)er the supply)oltage undergoes sag ( !ontrol o the series inverter output is perormed $ using pulse (idth modulation .P:1/ techni*ues in generating the in9ected )oltage& $husPC impro)es the po(er *uality +y pre)enting load current harmonics and +y correctinginput po(er factor& Fig(1 shows sstem $loc diagram o a three-phase >PQ!( Fi!#1 S(-./ ,l%$0 dia!'a AC%n.'%l S(-./ 3%' S/'i/- In4/'./' A simple control methodolog o Pulse Bidth /odulation PB/ #isdeveloped to control the series inverter control ( %he seriescomponent o >PQ! is controlled to in8ect the appropriate voltage$etween the point o common coupling P!!# and load* such thatthe load voltages $ecome $alanced* distortion ree and have thedesired magnitude( %he series flter is controlled such that it in8ectsvoltages  v dvra ,  v dvrb , v dvrc  # *which cancel out the distortionspresent in the suppl voltages  v sa    ,  v sb ,v sc  # thus maing thevoltages at the load terminal  v la *  v lb ,v lc # perectl $alanced andsinusoidal with the desired amplitude( %o generate in8ected voltages*suppl voltage signals are compared with the distorted sourcevoltage and these signals are then given to the PB/ controller ( %heoutput o the PB/ controller controls the si; switches o the 0SI o  International ,ournal o esearch eview in .ngineering and /anagement I,./# 0olume -1* Issue -+* Fe$ -+12 Page 3o4 56-7Page    ISSN (Online) No: INTERNATIONAL JOURNAL OF RESEARCHREVIEW IN ENGINEERING AND MANAGEMENT(IJRREM) the series inverter and generates the switching signals such thatthe voltage at the load $ecomes the desired sinusoidal reerencevoltage( (B)Contol S! te# $o S%&nt In'ete &steresis current controller is used to generate PB/ signal oroperation o 0SI( %he instantaneous reactive power p-:# theor isused in order to generate reerence signal or shunt APF( In thistheor* the instantaneous three-phase currents and voltages aretransormed to  α  −  β  - coordinates as shown in e:uation 1# and +# [ v 0 v α  v  β ]  ; √ 23   [  1 √  21 √  21 √  21  − 12 − 120  √  32 − √  32 ] [ V  sa V  sb V  sc ]  .!/ [ i 0 i α  i  β ]  ; √ 23   [  1 √  21 √  21 √  21  − 12 − 120  √  32 − √  32 ] [ i la i lb i lc ]  .8/ [  p 0  pq  ]  ; [ v 0  0 00  v α   v  β 0  − v  β  v α  ] [ i α  i  β i 0 ]  .3/ [ i cα  ¿ i c β ¿ ]  ; v (¿¿ α  2 + v  β 2 ) [ v α   − v  β v  β  v α   ] [ −ˇ  p +  p loss −ˇ q  ] 1 ¿  .</  %he $asic implementation o hsteresis control is $ased on derivingthe switching signals rom the comparison o the current error with a International ,ournal o esearch eview in .ngineering and /anagement I,./# 0olume -1* Issue -+* Fe$ -+12 Page 3o4 56-7Page
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