A new topology for quasi-z-source inverter

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1 pp.: A new opology or qua-z-ource nerer Negar Mrkazeman, Ebrahm Babae Elecrcal Engneerng Deparmen, Shabear Branch, Ilamc Azad Unery, Shabear, Iran, Emal:negarmrkazeman@auhab.ac.r Elecrcal and Compuer Engneerng, Unery o Tabrz, Tabrz, Iran, Emal:e-babae@abrzu.ac.r Abrac In h paper, a new crcu propoed or ep-up Z-ource nerer baed on QZSI (qua-z-ource nerer). The propoed opology nher all adanage o he conenonal opology. The propoed opology n comparon wh conenonal opology reduce he (Shoo-hrough) duy cycle by oer 5% a he ame olage boo acor. Theorecal analy o he propoed qzsi n he and non- operang mode decrbed. Then n order o how he perormance o he propoed ZSI, he mulaon reul on PSCAD oware are ued. Keyword: Z-ource nerer; qua-z-ource nerer; Shoo-hrough IAUCTB-IJSEE Scence. All rgh reered. Inroducon The Z-ource conerer employ a unque mpedance nework o couple he conerer man crcu o he power ource. The Z-ource conerer oercome he lmaon o he conenonal olage ource and curren ource conerer and prode a new power coneron concep. In [], he ep-up dc/dc conerer amly wh a cacaded qzs-nework ha been preened. Preened crcu n [], could be dered by addng o one dode, one nducor, and wo capacor o he conenonal qzsi and nher all adanage o he conenonal opology uch a boo and buck coneron n a ngle age, connuou npu curren, and mproed relably. Moreoer, a compared o he conenonal qzsi, reduce he duy cycle by oer % a he ame olage boo acor. Due o he decreaed duy cycle, he alue o nducor and capacor o he preened qzsi n [] could alo be decreaed. On he oher hand, or he ame componen rang and olage and curren ree, h crcu wll enure a hgher olage boo acor han wh conenonal opologe. The preened qzsi n [] can be appled o almo all dc/ac, ac/dc, ac/ac and dc/dc power coneron cheme. To urher decreae he duy cycle a he ame olage boo acor, he number o age o he qzs-nework could be ncreaed. In [], he man crcu o he Z-ource nerer or hree-phae Z-ype nerer ha been preened. Th nerer ha wo deren operang mode ncludng ae and non- ae. In [], he man crcu o he Z-ource nerer and he operaon prncple hae been decrbed n deal. Smple boo conrol mehod ued or conrollng qzsi []. To mproe he perormance o he conenonal ZSI, n [] eeral opologe hae been deeloped. Thee nerer are mlar o he Z-ource nerer preened n preou work, bu hae eeral adanage, ncludng n ome combnaon, lower componen coun and mpled conrol raege. The qzsi opologe, lke he ZSI, are well ued or yem whch requre a large range o gan, or a large gan, uch a moor conroller and renewable energy applcaon.. Propoed opology In h paper a new opology or ep-up Z- ource nerer propoed baed on qzi. Th cacaded rucure nher all adanage o he conenonal opology. The propoed opology n

2 comparon wh conenonal opology reduce he (Shoo-hrough) duy cycle by oer 5% a he ame olage boo acor. Accordng o he Fg., he propoed crcu dered by he addng o one dode, one nducor and wo capacor o he preened qzsi n []. The nerer a he oupu o ZSI can be ngle-phae or hree-phae. In Fg., he ngle-phae nerer ued. The propoed opology n comparon wh he preened crcu n [], reduce he duy cycle by oer 5% a he ame olage boo acor. Due o he decreaed duy cycle, he alue o nducor and capacor o he propoed opology could alo be decreaed. On he oher hand, or he ame componen rang and olage and curren ree, he propoed opology can generae a hgher olage boo acor han he conenonal opologe. In order o analyze he propoed rucure n and non- mode uppoed ha all o he crcu elemen uch a dode, capacor and nducor are deal. One o he SPWM conrol mehod or Z- ource nerer, mple boo conrol mehod. Fg. how he modulaon, he drer gnal or he our wche, and he gnal o mple boo conrol mehod. I we ue wo rgh lne and n n conenonal SPWM conrol mehod, mple boo conrol mehod obaned. In h mehod, wo ragh lne ( p and n ) are employed o realze he duy rao ( D ) []. The r one ( p ) equal o he peak alue o he nuodal reerence olage whle he oher one ( n ) he negae o he r one. Wheneer he rangular carrer gnal hgher han he poe ragh lne or lower han he negae ragh lne, he nerer wll operae n. Oherwe work a a conenonal PWM nerer []. D D D Fr Sage C C D D C D Fg.. Propoed qua Z-ource nerer gure C C C D Second Sage C D D Thrd Sage C C dc dc p S S S S A c, A r Generaon o PSM gnal wh hoo-hrough ae durng zero ae. Crcu analy o he propoed qzsi The equalen crcu o propoed opology durng non- and mode are hown n Fg.. Wh h explanaon ha, n non- ae he nerer brdge een by dc de equal o a curren ource and dode conduc and he olage ncreae epwe rom zero o maxmum ( ). Bu n he ae, he nerer brdge een by dc de equal o hor crcu and dode do no conduc and he nerer brdge npu olage ( dc ) and energy ored n capacor ranerred o he nducor. By applyng K o crcu or Fg. (a) we hae: C C C C C d c C dc () () () () By applyng K o crcu or Fg. (b) we hae: C C S S S S C C5 A c a b (5) () (7) (8) p n

3 T 5 (a) (b) Fg.. Equalen cheme o he propoed qzsi (a) non- ae (b) ae In eady ae, he aerage alue o olage acro nducor equal o zero. In oher word: T T d D ( ) D C (9) d D ( C C D C C () d D ( C C D C C () d D ( D C () Smplyng (9) and () and conderng () o (), we oban a below: D C () D D D C D C C D D D D D C C C D D C D C C D C D C C C C C D C C C D D C dc () (5) dc C C5 D D D D () (7) D C (8) D Conderng (), (7) and (8), he maxmum amoun o dc-lnk olage ( ) obaned a below: d c,max (9) D olage acro he nducor a and non- ae can be obaned conderng he equaon o olage acro he capacor. I approed ha olage acro he nducor a non- and ae are he ame. Thu we hae: () T Conderng (5) o (8), we hae: D () D Suppong curren rpple and conung o and T ( perod) rom () and () n aboe equaon, he amoun o obaned a ()..I () T T D ().I T D () Fnally conung o I rom (5) n aboe, he amoun o nducance o propoed qzsi calculaed a (): P I (5) D D ().P D P he raed power and he requency o qzsi. By applyng KC or Fg. (a), he ollowng equaon can be obaned: C I I (7) I (8) C d c I C I (9) I () C d c I I C () By applyng KC or Fg. (b), we hae: I I () C

4 C I () I () C I (5) C In he eady ae, he aerage alue o curren hrough capacor zero. Neglecng he rpple o lowng curren n nducor, we hae: d D ( I ) D I I ) C d D ( I ) D I I C d D ( I ) D I I C d D ( I ) D I I C d D ( I ) D I I C d D ( I ) D I I C () (7) (8) (9) () () Conderng ()-(), or ae he ollowng equaon or capacor curren obaned: () C C C C Accordng o (7) o (), or non- ae he ollowng equaon are obaned: () C () C C (5) C5 C In order o oban he alue o capacance C C, C, C, C, 5 C and accordng o () T and ubung rom equaon (), we hae: () C C C T P C. C (7) D T Fnally accordng o (), or ae and ubung rom (9) he ollowng reul obaned: PD C C C C. d c, max P D ( ).5 D (8) Accordng o (9), he olage gan declared a below: dc,max B (9) D Conderng he aboe equaon, we can how he duy cycle o ae : B D (5) B The duy cycle or preened opology n [] gen by: B D (5) B For ame olage gan or preened opology n [] and propoed opology, we hae: B B (5) B B Conderng he aboe equaon, een ha duy cycle o ae or propoed qzsi abou.5 le han he duy cycle o ae or preened qzsi n []. In order o calculae he alue o nducor o propoed rucure, noe ha he alue o nducance n preened qzsi n [] obaned a below: D D (5).P D Conderng () relaed o nducor o propoed rucure dded o (5) relaed o nducor o preened qzsi n []. Then ubue o alue relaed o propoed rucure duy cycle and alue o duy cycle relaed o preened qzsi n [], we oban: D D.P D.78 (5) D D.P D Noe ha n aboe equaon, npu olage, raed power and operang requency condered he ame or each wo rucure. I obouly known ha n propoed qzsi he alue o nducor wll be.% le han preened qzsi n []. In order o calculae he alue o capacor n propoed rucure, noe ha he alue o capacance n preened qzsi n [] obaned a below: C P ( ) (55).5 D D Conderng (8) relaed o capacor o propoed rucure dded o (55) relaed o

5 7 capacor o preened qzsi n []. Then ubue o alue relaed o propoed rucure duy cycle and alue o duy cycle relaed o preened qzsi n [], we oban: P D ( ) D.5.75 (5) P D ( ) D.5 Noe ha n aboe equaon, npu olage, raed power and operang requency condered he ame or each wo rucure. I obouly known ha n propoed qzsi he alue o capacor wll be 5% le han preened qzsi n []. The waeorm o olage and curren or propoed qzsi hown n Fg. or D.5. I o be noed ha n Fg., A he carrer wae, A he reerence nuodal wae, poe r ragh lne ( ) equal o maxmum o reerence p nuodal wae and negae ragh lne ( n ) equal o mnmum o reerence nuodal wae. Alo T and T non are wchng perod o ae and non- ae a a complee wchng cycle repecely.in Fg. 5, ae duy cycle hown a a uncon o he olage boo acor or preened one age and wo age qzsi alo or propoed qzsi. The duy cycle o he propoed qzsi and poe npu olage hould neer exceed oneourh o he wchng perod, whle n he conenonal opologe,, n heory, poble o ue he duy cycle alue up o one-hal (or ngle-age) and one-hrd (or wo-age). Praccally, no adable o operae a hgh duy cycle alue becaue wll caue hgh power loe n he componen, whch could erouly reduce he conerer ecency. c A c, A r D D D D D D D D D D D D C C C A c A r p n C I D. One Sage I Two Sage Thrd Sage dc I.5..5 T ( D ) T non B T D T Fg.. Shoo-hrough duy cycle a a uncon o he olage boo acor or deren ype o qzs-nework Fg.. olage and curren waeorm o propoed qzsi or D.5

6 8. Expermenal ercaon In conra o he preened oluon n [], he propoed qzsi, prode a reducon o 5% n he duy cycle a he ame npu olage boo acor. Depe he ncreae number o pae componen and her ummarzed alue, raed alue o he nducor and capacor o he propoed qzsi could alo be reduced n comparon wh he preened qzsi n []. For example, depe he 5% capacance reducon, he ummarzed capacance alue ( C C C C5 C ) requred or he propoed qzsi.5% hgher han ha o he preened qzsi n []. The ummarzed alue o he requred nducance ( ) wll alo be.5% hgher. From here, he eably o he propoed qzsi emerge. Conderng loe n he componen o he qzs-nework (olage drop n dode, ranor and nducor), 88 wa e a he dered dc-lnk olage, whch mean ha he woold boo o he npu olage wa requred. Moreoer, wa aed durng he expermen ha he propoed qzsi enure connuou npu curren n he operang mode. Accordng o equaon obaned or olage acro he nducor and capacor, heorecal reul are dcued alo propoed alue or nducance and capacance are calculaed o compare wh reul o mulaon. Then n order o how he perormance o propoed qzsi, he reul o mulaon are preened by PSCAD oware. Aumng and D.5 n () o (9) we oban he alue o olage acro he C 5 and maxmum dc-lnk olage ( ) a hown n able. Alo he alue o olage acro he nducor a non- ae are obaned ung () o () a ubung he calculaed alue o olage o capacor a a dened. Then mlarly he alue o olage acro he nducor a ae are obaned a hown n able ung and olage o capacor n (5) o (8). In order o calculae he alue o nducor n propoed rucure, accordng o (5) and denng 7.5 H or alue o nducor n wo age nerer, we oban 9. H a he alue o nducor or propoed qzsi. Smlarly accordng o (5) and denng F or alue o capacor o preened qzsi n [], we oban 8 F a he alue o capacor o propoed qzsi. The alue o oupu load, requency o reerence wae and requency o wchng ued n oware are a hown n able.. Concluon The propoed conguraon nher all adanage o he preened qzsi n []. Moreoer, he propoed qzsi reduced he duy cycle by oer 5% a he ame olage boo acor and componen ree a he preened qzsi n []. Moreoer, durng he expermen known ha he propoed opology, enure connuou npu curren n he operang mode, hu eaurng he reduced re o he npu olage ource. Depe he reduced duy cycle, he propoed qzsi, prode he demanded woold boo o he npu olage. The propoed opology prode a reducon o 5% n he duy cycle a he ame npu olage boo acor. I obouly known ha n propoed qzsi he alue o nducor and capacor wll be % and 5% le han conenonal rucure repecely. Depe he ncreae number o pae componen and her ummarzed alue, raed alue o he nducor and capacor o he propoed qzsi could alo be reduced n comparon wh he preened qzsi n []. For example, depe he 5% capacance reducon, he ummarzed capacance alue requred or he propoed qzsi ( C C C C5 C ).5% hgher han ha o he preened qzsi n []. The ummarzed alue o he requred nducance ( ) wll alo be.5% hgher. D Table.. Uable parameer or propoed qzsi or D.5 C C C C C C 5 Oupu load alue Frequency reerence Frequency wchng.5 8 F 9. H R 5 Hz khz mh Table.. Reul o heorecal and mulaon o he propoed qzsi C C C ( ) non ( ) Compuaonal reul Smulaon reul

7 9 (a) (g) (b) (h) (c) (d) () () () Fg. 5. Meaured waeorm o he propoed qzsi or D.5 (a) npu olage conerer (b) olage acro he capacor C (c) olage acro he capacor C (d) olage acro he capacor C (e) olage acro he capacor C () olage acro he capacor C 5 (g) olage acro he capacor C (h) olage acro he nducor () oupu olage conerer Reerence [] D.nnko, I. Roao, R. Srzeleck, and M. Adamowcz, Sep-up dc/dc conerer wh cacaded qua-z-ource nework, IEEE Tran. Ind. Elecron., ol. 59, no., pp. 77-7, Oc.. [] F.Z. Peng, Z-Source nerer, IEEE Tran. Ind. Appl., ol. 9, no., pp. 5-5, March/Aprl. [] F. Z. Peng, M. Shen, and Z. Qan, Maxmum boo conrol o he Z-Source nerer, n Proc. IEEE PESC, pp. 55-,. [] J. Anderon and F.Z. peng, Four qua-z-ource nerer, n Proc. PESC, Rhode, ol. 5, no. 9, pp. 7-79, June,8. [5] F.Z. Peng, Z-Source nerer or moor dre, n Proc. PESC, pp. 9-5,. [] F.Z. Peng, X. Yuan, X. Fang, and Z. Qan, Z-Source nerer or adjuable peed dre, IEEE Power Elecron. e., ol., no., pp. -5, June. [7] M. Shen, J. Wang, A. Joeph, F.Z. Peng,.M. Tolber, and D.J. Adam, Maxmum conan boo conrol o he Z- Source nerer, n Proc. IEEE IAS,. [8] Y., J Anderon, F.Z. Peng, and D. u, Qua-Z-ource

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