Dynamic Voltage Restorer (DVR) Through MATLAB Simulation

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1 Dynmi Voltge Restorer (DVR Through MTL Simultion Mr. Sushnt S. Snnse, Ms.lkThkur Dept. of eletril Engg, SSSIST, Sehore ssoite Professor, Dept. of eletril Engg, SSSIST, Sehore strt - Eletriity exellene hs eome n inresing hllenge to utilities n ustomers. Voltge sg/swell is the most not unusul type of energy exellent isturne within the istriution eie. Voltge sgs/swells rise oth insie the trnsmission n istriution network n the tehniues use for the reimursement re speifi. This pper presents n erifies the use of ynmi oltge restorer (DVR to efen sensitie hunres from the onseuenes of oltge sg/swell on the istriution feeer. DVR is one of the ustom strength eies tht re use s n effetie solution for the protetion of sensitie msses towrs oltge isturnes in power istriution mhine. For mitigtion of oltge sg/swell y using DVR it's miles importnt for the DVR ontrol gget to stumle on the strt n en of oltge sg/swell n to eie the sg/swell lue n ny relte segment shift. The DVR, whih is use in series with touhy lo, must e ple of reply uikly to oltge sg/swell if en users of sensitie eie re to reel in no oltge sgs/swell. The DQO theory is use for the etetion of sgs/swells, wheres the mnipulte of the oltge supply inerter (VSI is one with the help of Sinusoil Pulse With Moultion (SPWM The simultion ws omplete with the help of SIMULIK & MTLn the effets he een etermine to e in orne with ie. Keywors: Dynmi Voltge Restorer (DVR, --o theory, Sinusoil Pulse With Moultion (SPWM, Voltge sg/swell. I. ITRODUTIO From preious few yers euse of the prolifertion n eelopment of oltge-sensitie lo euipment in inustries there's rious impt on helth fility euipment, utomti mnufturing strins, p enters whih ens up egrtion of energy exellent. While "eletriity high-ulity" is hny time perio for plenty, it's fr the plesnt of the oltge in ple of eletriity or moern-y tht is in relity esrie with the i of the term in []. Voltge stisftory prolems insie the shpe of oltge sgs, oltge hrmonis, n oltge swells n purpose extreme tehniue isruptions, resulting in st monetry n/or t losses [], Voltge sg is short-term lower within the rms oltge (% 9% of the nominl oltge on the power freueny of length from.5 yles to one minute [4]. Voltge sg is ommonly ue to rief-iruit fults, whih inlues single-line-to-groun fult in power system n with the i of the strtup of inution motors of huge sores [4] [6]. Voltge swell is efine s short urtion rise in r.m.s oltge from. p.u. to oe for the urtion of.5 yles to one minute. [7]. The priniple moties for oltge swells re swithing ig pitors or the elimintion of lrge msses [8] Figure.Voltge reution stnrs of IEEE St. ll rights Resere 84

2 Interntionl Journl of Moern Trens in Engineering n Reserh (IJMTER Volume, Issue, [Deemer 5] ISS (Online: ; ISS (Print:9-86 Dynmi oltge restorer (DVR is n eletriity eletroni onerter-primrily se tool, esigne to protet ritil los from elier fet oltge isturnes. Through inserting oltge of esire importne n phse perspetie, it restores the uren-sie oltge to e lne, sinusoil n nominl lue, een when the supply oltge is unlne or istorte. further, the DVR ompenstes for oth stey-ntion n ynmi oltge est troules, n is le to prouing or soking up tie n retie strength t its terminls [], [4]. II. THE OEPT OF THE DVR I THE DISTRIUTIO SYSTEM.. DVR opertion n omponents DVR is eie whih opertes when the soure oltge is unlne or istorte. DVR restores the lo-sie oltge to the esire mplitue y injeting oltge of reuire mgnitue. In other wors we n sy tht the min funtion of the DVR is to regulte the weform of lo oltge when ny sg or swell ours, the esire lue of reuire oltge will e injete to the lo point. Following eution explins the si priniple of DVR. Soure Voltge + DVR Voltge = Lo Voltge ( Detet suggests the onfigurtion of the DVR long with n inerter, series or injetion trnsformer, inerter mnipulte eie n energy storge. The primry hrteristi of DVR is the protetion of touhy lo from ny isturnes oming from network. The primry omponents of the DVR re summrize uner... Injetion trnsformers In -segment eie, either single-setion trnsformer units or one phse trnsformer unit n e use for oltge injetion purpose (Zhn et l.,... pitor nk DVR hs ig D pitor to mke ertin stiff D oltge input to inerter..4. Inerter Voltge soure inerter (VSI of low oltge n high urrent with step up injetion trnsformer is use to trnsform storge into shpe (Ri et l., Pssie filters To trnsform the inerte PWM weform right into sinusoil weform Pssie filters re use. Tht is omplishe with the i of eliminting the unesirle hrmoni ities generte VSI moement. etter orers hrmoni omponents istort the ompenste output oltge (Zhn et l.,..6. Grge unit Its miles hrgele for power storge in D shpe. Flywheels, tteries, superonuting mgneti power storge (SMES n wesome pitors my e use s power storge eies. It elements the rel strength reuirements of the system whilst DVR is use for ompenstion (nei et l., 6. The si onept of DVR is to injet the lking oltge yles into the system i series injetion trnsformer eh time oltge sgs re present within the eie supply ll rights Resere 85

3 Interntionl Journl of Moern Trens in Engineering n Reserh (IJMTER Volume, Issue, [Deemer 5] ISS (Online: ; ISS (Print:9-86 Figure. onentionl iruit onfigurtion III. I-PHSE OMPESTIO METHOD The inoultion oltge is in phse with the soure oltge. When the soure oltge roplets ue to sgging glithes in the network, the inoultion oltge shpe y the Voltge Soure Inerter (VSI will injet the missing oltge se on the rop oltge sle. This tehniue n e shown in Figure. Figure. In-Phse ompenstion tehniue The phsor figure to show the sle n ngle of oltge inoulte y the DVR ( inj is shown in Fig.4. inj is the etor ltertion mi Pr e Sgn Sg. The min rwk of this proeure is tht it neessittes higher pity energy storge eie inj Pr esg Sg.. (.. Pre-sg metho In this metho, there is ltertion etween Vpre-sg n the sg oltge (Vsg. The inoultion oltge will inoulte the ltertion oltge etween them s shown in Figure 4. Figure 4. Pre-sg ompenstion tehniue IV. -- TRSFORMTIO Diret urture trnsformtion lso referre to s Prk s trnsformtion is mthemtil trnsformtion use to simplify the elution of three-segment iruits. In the se of lne ll rights Resere 86

4 Interntionl Journl of Moern Trens in Engineering n Reserh (IJMTER Volume, Issue, [Deemer 5] ISS (Online: ; ISS ll rights Resere 87 setion iruits, softwre of the -- trnsformtion reues the portions to D portions. Simplifie lultions n then e omplete on these imginry D portions efore ppering the inerse remoel to reoer the rel three-setion results. The pproh gies the sg intensity t with egin n stop instnes. The untities re expresse s the on the spot spe etors [7]. First off onert the oltge from -- referene frme to -- referene with the i of using following eution. T.. ( os( os(.. (4 Where, T is the trnsformtion mtrix,,, re instntneous supply oltge of setion, n respetiely n,, re -xis, -xis, zero-xis element of referene frme respetiely. The thet (θ is esrie i the perspetie etween segments to the -xis [7]. oe eution efines the trnsformtion from oltges,, to sttionry frme. In this trnsformtion, setion is ligne to the -xis this is in urture with the -xis. The ontrol is se on the ontrst of oltge referene n the mesure terminl oltge. The oltge sgs is etete while the elier oltge rops eneth 9% of the referene oltge. oth the oltges nee to e onerte to frme n the ifferene in oltge in - frme offers injete oltge in ientil frme of referene. Then the - frme signl to e trnsforme to frme of referene the usge of inerse trnsformtion gien s follows: T. (5 o os( os(. (6 These inoulte oltge in frme of orienttion t s the ontroller signl for the oltge soure inerter. The pulses to the swithes re proue using sinusoil PWM tehniue (SPWM. V. SIMULTIO RESULTS MTL simultion is omplishe to fin out the oerll performne of DVR for repyment of oltge sg using - ie. three-φ eletriity gget with the prmeters gien in tle is simulte the usge of sim power mhine lok set. n RL lo is onsiere for the he look t. oltge supply inerter is esigne the usge of MOSFET s the swithing eies n D oltge for the inerter lulte s 8V.

5 Vsoure Interntionl Journl of Moern Trens in Engineering n Reserh (IJMTER Volume, Issue, [Deemer 5] ISS (Online: ; ISS (Print:9-86 TLE. System prmeter n onstnt le Prmeter Soure oltge per phse D us Voltge Filter Inutne Vle V 8V.7µH Filter pitne 6µF Lo Resistne Lo Inutne 4 Ω 6mH Figure 5. Shows the - trnsformtion in MTL/SIMULIK for genertion of referene oltge. powergui Disrete, Ts = 5e-5 s Sope Progrmmle Voltge Soure V-I Mesurement V I V-I Mesurement V I RL Lo Progrmmle Voltge Soure V-I Mesurement V I Sope _to_ sin_os _to_ Extrte omponent _to_ Sutrt Sope sin_os Disrete -phse PLL Fre sin_os Ref. ompensting oltge V(pu wt Sin_os Figure 6. Simulink igrm showing genertion of referene oltge using - theory Three phse progrmmle oltge soure hs een use for reting 5% oltge sg for the urtion of.s n strt time of sg is.5s n en time is o.5s s shown in Fig time in se. ( ( Figure 7. ( soure oltge with sg, ( shows n ll rights Resere 88

6 Out Out Out Out4 Out5 Out6 onn onn onn Vinjet Interntionl Journl of Moern Trens in Engineering n Reserh (IJMTER Volume, Issue, [Deemer 5] ISS (Online: ; ISS (Print:9-86 The injetion oltge is generte y eluting the referene oltge in - oy with - referene frme oltge of the tul strength gget oltge. The ifferene in these oltges is to e injete through the oltge soure inerter. This oltge will t euse the referene ompensting oltge for the inerter. this is shown in Fig time in se. Figure 8. shows Referene oltge Figure 9. Voltge to e injete sine tringulr PWM pproh is use to generte pulses to the swithes of three setion inerter. The output of the three segment inerter is tthe in series with the trnsmission line with the help of series trnsformers s shown in Fig. 9 PLL lok is use to synhronize the supply oltge n the injete oltge VSI with SPWM ontrol ontinuous V I injetion trnsformer V I Progrmmle Voltge Soure V-I Mesurement V-I Mesurement RL Lo Progrmmle Voltge Soure Fre V (pu wt Sin_os -phse PLL V I V-I Mesurement [] Goto sin_os [] _to_ Goto [] Goto Sutrt sin_os sin_os _to to_ Figure. Simulink igrm showing the DVR in the istriution system Figure. Three phse lo oltge VI. OLUSIO This pper hs propose n moele the Dynmi Voltge Restorer (DVR se on sinusoil PWM metho using MTL/SIMULIK. The referene oltge generte se totlly on - referene onept. the primry lessings of this DVR is low prie n it s ontrol is simple. The DVR n mitigte long perio sg itionlly. The liity of propose pproh is epte y using results to the simulte in MTL/SIMULIK. REFEREES [] Roger. Dugn, Mrk F. MGrnghn, Sury Sntoso, H. Wyne ety, Eletril Power Systems Qulity, hpter & pp. -, Seon Eition, Tt MGrw-Hill, 4. [] M. H. J ollen, Unerstning Power Qulity Prolems, Voltge Sgs n Interruption, Pistwy, J: IEEE Press, ll rights Resere 89

7 Interntionl Journl of Moern Trens in Engineering n Reserh (IJMTER Volume, Issue, [Deemer 5] ISS (Online: ; ISS (Print:9-86 [] Siny George n Viek grwl DSP se ontrol lgorithm for Series tie Filter for Optimize ompenstion uner on-sinusoil n Unlne Voltge onitions IEEE trnstion on Power Deliery, ol., issue, Jnury 7, pp. -. [4] Siny George n Viek grwl Optimum ontrol of Seletie n Totl Hrmoni Distortion in urrent n Voltge uner on-sinusoil onitions IEEE trnstion on Power Deliery, ol., issue, pril 8, pp [5] In K.P. Ross, MIEE, Omnierter In. oltge sgs: n explntion - uses, effets n orretion -prt I oemer/ Deemer 7 [6] IEEE Stnrs or (995, IEEE St , IEEE Reommene Prtie for Monitoring Eletri Power Qulity. IEEE In. ew York. [7] S.S. hoi, J. D. Li n D.M. Vilthgmuw, generlize oltge ompenstion strtegy for mitigting the impts of oltge sgs/swells, IEEE Trns. on Power Deliery, ol., no., pp.89-97, July [8] Fwzi L Jower Moeling n Simultion of Dynmi Vltge Restorer (DVR se on Hysteresis Vltge ontrol in The r nnul onferene of the IEEE Inustril Eletronis Soiety (IEO [9] hngjing Zhn, Vign Kumrn Rmhrmurthy, tputhrjh ihols Jenkins, "Dynmi Voltge Restorer se on Voltge-Spe Vetor PWM ontrol," IEEE Trns. Inuistril pplitions, ol. 7, o.6 pp , oemer/deemer in Pro. [] Sriplli Rjesh, Mhesh K. Mishr, n Srihr K, Design n Simultion of Dynmi Voltge Restorer (DVR Using Sinusoil Pulse With Moultion (SPWM 6th TIOL POWER SYSTEMS OFEREE, 5th-7th DEEMER, [] H.P.Tiwri, pitor Rting Seletion for Voltge Sg ompenstion in DVR System Interntionl Journl of Innotion, Mngement n Tehnology, Vol., o.,ugust ISS: ll rights Resere 9