MATHEMATICAL MODEL OF THYRISTOR INVERTER INCLUDING A SERIES-PARALLEL RESONANT CIRCUIT
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1 78 Avance n Elecrcal an Elecronc Engneerng MATHEMATIA MODE OF THYRISTOR INVERTER INUDING A SERIESPARAE RESONANT IRUIT M. uf, E. Szycha Faculy of Tranpor, Techncal Unvery of Raom, Polan ul. Malczewkego 9, 66 Raom, el.: , mal: m.luf@pr.raom.pl, e.zycha@pr.raom.pl Summary The arcle preen a mahemacal moel of hyror nverer nclung a ereparallel reonan crcu wh he a of ae varable meho. Maple proceure are ue o compue curren an volage waveform n he nverer.. INTRODUTION Reonan hyror nverer are apple n nucon heang, welng, elecrc heang, an oher area where heang procee are ule whch occur effecvely n broa frequency range. Degn of he nverer nclue a reonan crcu ha overloa a he nverer wchng frequency [, ]. Volage a loa of reonan nverer nuoal n naure where he nverer operang frequency range from everal hunre o a ozen houan Herz. Th arcle wll preen a mahemacal moel of he nverer reonan crcu wh he a of operaor ae varable meho by mean of Maple ofware proceure.. DESIGN OF THE INVERTER The man crcu of he nverer how n Fgure [, ]. Inucance an reance R repreen loa of he nverer. apacance a parallel capacor o compenae reacve power. apacance conue a ere capacor ha parcpae n ocllaon of upply curren. The preence of affec he curren naure of ource upplyng nonconnuou curren. The choke alo help o rerc / of upply curren conuce by hyror an o reuce ynamc loe acro hyror.. MATHEMATIA ANAYSIS OF THE INVERTER'S OPERATION Mahemacal analy of elecromagnec phenomena n he nverer nvolve magnue whch are funcon of me : curren (, ( an volage u u (, u u ( (Fg.. Parameer of elemen ue n he converer' analy conform wh parameer of mulaon moel elemen a ae n Table. Table. Parameer of he nverer elemen Parameer R E Un [mh] [] [µf] [V] Parameer S f Un [µf] [mh] [Hz] 5.9 Four me nerval are nguhe n he nverer operaon cycle []. The mahemacal analy of curren an volage of he nverer reonan crcu preene on he ba of he operaor meho [5]. The meho mple ha en conon of each nerval become nal conon of he ubequen nerval. Mahemacal ecrpon of he nverer operaon n each of he nerval uner analy compre yem of lnear egree fferenal equaon nclung he four magnue pecfe before, egnae a ae varable x ( a. Fg.. The man crcu of he reonan nverer The auhor aume ha he nverer operae n he range of naural commuaon []. Thyror T, T an T, T are alernaely wche on a frequency f n me nerval T/. The conucance angle of a hyror par λ (λ < π. (Fg.. ( x (, ( x (, u ( x (, u ( x (, ( The yem of four fferenal equaon ha ecrbe operaon of he nverer n he k h me nerval can be preene a a marx: Xk Ak Xk B U ( where:
2 Mahemacal moel of hyror nverer nclung a ere 79 xk( xk( Xk( xk ( xk( ( k ( k ( k u ( ( k u ( ae vecor of he yem n k h me nerval (k,,, where: xk ( ae varable n he yem, Ak yem marx for k h me nerval, B conrol marx, U( ( npu funcon. Afer aplace ranformaon of (, he ranform Xk Xk( of he ( reul: [ ] X k k Xk( B ( marx nvere o k, Xk( nal conon vecor for k h me nerval (value of varable xk ( a he ar of k h nerval. Deermnan of k a characerc polynomal Mk ek of he ranform (. Roo of Mk have eenal mpac on he crcu ynamc. The oluon of ( he ae vecor Xk [ Xk( ] he orgnal ranform (. Table ummare facor n he fferenal equaon ha ecrbe he nverer ynamc n four conecuve me nerval. They epen on parameer of he crcu uner analy, preene n Table. where: k [ I Ak] Table. Facor n he fferenal equaon ha ecrbe he nverer operaon n four me nerval R a g E b R h c k In he analy of he nverer operaon, value of componen of he nal conon vecor X ( for he fr me nerval are eermne on he ba of waveform obane n mulaon eng of he nverer wh he a of Smplorer ofware []. Fnal conon of each nerval become nal conon of he ubequen nerval. Fg.. urren an volage waveform n he nverer obane from mulaon; operang frequency fhz, oupu power PkW ( k (k ( k (k ( k Value of { A, B,, D, E } n he ae varable expreon xk ( of he ae vecor X k( for k h me nerval were eermne wh he help of Maple ofware. Inerval In he fr me nerval:, (Fg. T an T conuc. The reonan crcu for he fr nerval hown n fgure. Fg.. Reonan crcu n he fr me nerval, The crcu n Fgure ecrbe n he fferenal equaon ( a k,
3 8 Avance n Elecrcal an Elecronc Engneerng where: x ( a b x X, c c A, g B x ( h h x k (5 Tranform of he oluon o X( become ( for k. In he even, he characerc polynomal M ( become: a ( hc kc hb ac( h k hkbc M (6 Takng no accoun value of {a, b, c, h, k} n Table, M ( (6 become: ( m n ( p ( M q (7 where: m 66. 6, n , p 8., q 8.5. Value of ( roo were calculae ung relevan proceure of Maple. The vecor of nal conon X ( a k : x ( 88 x ( X ( (8 x ( 67 x ( Takng no accoun he nal conon (8, he ranform of X ( n he fr me nerval : x x X x ( (9 ( M x where: 88 67b 88 hc kc bhc bhg 67bkc hbg hcb ( ( 587c g ( 88hc 587ca ag 67 ( 88h 67a ( hg 67kc hc 88 ahg 67akc hca a khc ( kg hc hb 67kc ( 88khc kag 67kca ahc khbg.. The nal me, uraon of p he fr me nerval k.6 x ( are aume. Waveform of x n he fr me nerval, are preene n Fgure, 5, 6, 7. x e ( ( m ( ( e ( A co( n B n( n ( p ( ( co ( q ( D n ( q ( Fg.. Inerval he waveform of varable x curren ( a, x e x ( ( m ( ( e ( A co( n B n( n ( p ( ( co ( q ( D n ( q e ( Fg. 5. Inerval he waveform of varable x ( curren a, ( ( m ( ( u e ( A co( n B n( n ( p ( ( co ( q ( D n ( q ( By eermnng orgnal of x n he vecor (9, yem ae varable x x ( are expree for he me nerval,, (.67,
4 Mahemacal moel of hyror nverer nclung a ere 8 Fg.8. Reonan crcu n he econ me nerval, The crcu n Fg.8 ecrbe n he yem of fferenal equaon ( a k, where: x Fg. 6. Inerval he waveform of varable x ( volage u a, ( ( m ( ( u e ( A co( n B n( n ( p ( ( ( ( co( q D n( q E e Fg. 7. Inerval he waveform of varable x ( volage u a, ( En value x (.6 k of X( varable for he fr nerval become nal value of hee varable n he econ me nerval: Inerval x ( 595 k (.5 X ( x k X ( ( k x ( 755 k x ( 89 k The econ me nerval, (Fg. ar when T, T are off an connue unl T, T are on. The reonan crcu wche off he upply volage llurae n Fgure 8. In he econ me nerval, upply curren ( (Fg.. x a b x X, A, B x h x (5 Tranform of he oluon o (6 ha he form of ( a k. M : haracerc polynomal ( ( a hb M (6 Takng no accoun roo of (6, he characerc M can be preene: polynomal ( ( g M ( r (7 where: g , r Takng no accoun he value of nal conon vecor ( for k, ranform of X( n he econ me nerval reul: b ( g r x,5 x X x ( h 755a x ( g r 89 By eermnng he orgnal of ranform x x ( of (8, he yem [ ] ae varable x x ( are expree for he me nerval, (.,.559. The waveform of varable, x x n he econ me nerval are preene n Fgure 9,,,. ( ( g ( ( e ( A co( r B n( x r (9
5 8 Avance n Elecrcal an Elecronc Engneerng Fg. 9. Inerval he waveform of varable x ( curren a, ( x.5 ( Fg.. Inerval he waveform of varable x ( volage u a, ke n he prevou me nerval, he en value x (.8 k of X( varable for he econ nerval become he nal value of he ame varable n he hr me nerval. In he hr me nerval, (Fg., T an T are on. The reonan crcu for he hr nerval hown n Fgure. In h cae, me waveform are preene lke n he fr nerval, wh he nal conon of he hr nerval aume en value of varable n he econ operang nerval of he nverer. Fg.. Inerval he waveform of varable x ( curren a, ( ( g ( ( u e ( A co( r B n( x r ( Fg.. Reonan crcu n he hr me nerval of he nverer The fourh operang nerval, (Fg. begn when T, T are off an connue unl T, T are on. The reonan crcu, wche off he upply volage, funcon lke n he econ nerval an llurae n Fgure 8. Fg.. Inerval he waveform of varable x ( volage u a, ( x u 89 (. ONUSION The arcle ha preene a mahemacal moel of elecromagnec phenomena ha occur urng able operaon of hyror nverer nclung a ereparallel reonan crcu. Phenomena of curren commuaon among he crcu elemen are exclue from h analycal meho. alculaon reul have he form of curren an volage waveform n he crcu whch are connuou a bounare of me nerval n he nverer operaon cycle. Analycal reul how conformy wh reul of he yem mulaon eng. The preene mahemacal epenence enable o analye he yem envy o varaon of parameer. However, hey are hghly complex.
6 Mahemacal moel of hyror nverer nclung a ere 8 REFERENES [] KÁOR G., ŠPÁNIK P., DUDRÍK J., UFT M., SZYHTA E.: Prncple of operaon of hreelevel phae hf conrolle converer, KTU Journal of Elecronc an Elecrcal Engneerng, T7 Elecronc, 8. Nr (8, Kauna huana, pp. 697 (ISSN 95 [] KAZIMIERZUK M.K., ZARKOWSKI D.: Reonan Power onverer, A Wley Inerence Publcaon. John Wley an Son. Inc. New York, Torono, Sngapore 995 [] RODA M.R., REVANKAR G.N.: VolageFe Dconnuou urren Moe HghFrequency Inverer for Inucon Heang, IEEE Tranacon on Inural Elecronc an onrol Inrumenaon, vol. IEI5 978 [] SZYHTA E.: Thyror nverer wh ereparallel reonan crcu, Archve of Elecrcal Engneerng, VO.IV No., /5, pp. 5 [5] UFT,., SZYHTA, E.: ZVS D/D,,, 7, cc.786, 7,
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