Cement plant case

Ruzivo rwekutanga rwevashandisi
Fekitari yesimende inogadzira kongiri yekuvaka yakasiyana-siyana.Iyo kambani ine 3 mitsara yekugadzira.Iyo switching power supply inoshandisa inverter drive motors, 2000KVA2, 630KVA transformer, uye yega yega transformer ine capacitor compensation cabinet padivi pekumanikidza.Iyo dhizaini yemagetsi system dhizaini ndeiyi inotevera:

Data chaiyo yekushandisa
Simba rekubuda kweiyo soft starter ye2000KVA transformer i1720KVA, avhareji simba chinhu PF=0.83, kushanda parizvino i2500A, simba iri 530KVA630KVA transformer, avhareji simba chinhu PF=0.87, uye kushanda ikozvino 770A.Iyo reactive simba rekubhadhara kabati pasi peshanduko yega yega kazhinji ine nzendo dzemagetsi, capacitor mafuta kuvuza, uye control panel inoratidza ruzivo rusingatenderi mashandiro asina kujairika.Naizvozvo, iyo yakazara simba chinhu ingori 0.84, uye reactive simba chirango chinenge 20,000 muna Ndira.Uye kugadzira mutsara mota uye zvinyoro zvinotanga dzimwe nguva zvinogona kukanganisa kugadzira.

Simba System Situation Analysis
Mutoro mukuru weiyo inoshandura ballast ndeye 6 single-pulse ballasts.Iyo ballast midziyo inogadzira huwandu hukuru hwepulse ikozvino mubasa rekushandura AC kuita DC.Iyo yakajairika pulse ikozvino sosi uye inoiswa mune yemagetsi grid.Harmonic currents inokonzeresa pulsed yazvino yekushanda voltage kune iyo hunhu impedance yegidhi remagetsi, zvichikonzera kurasikirwa kwemagetsi ekushanda uye zvazvino, zvichiisa mungozi kunaka uye kuchengetedzwa kwekushanda kwekuchinja magetsi, kuwedzera kurasikirwa kwemutsara uye kutsauka kwekushanda kwemagetsi, uye kukonzera kukanganisa iyo grid yemagetsi uye zvidyarwa zvemagetsi ivo pachavo Kufurira.
Iyo program controller komputa interface (PLC) inonzwa kune harmonic kukanganisa kweiyo inoshanda voltage yekuchinja magetsi.Zvinowanzo taurwa kuti iyo yakazara pulse ikozvino inoshanda voltage furemu kurasikirwa (THD) isingasviki 5%, uye yega pulse ikozvino inoshanda voltage kugadzirwa kana kushanda, zvichiita kuti pave netsaona huru yemhosva yekugadzira.
Kana iyo reactive power compensation capacitor bank yaiswa mukushanda, nekuti iyo pulse yazvino hunhu impedance yebhangi capacitor idiki, huwandu hukuru hwepulse ikozvino hunounzwa mukuumbwa kwecapacitor, uye huwandu hwazvino hunowedzera nekukurumidza, huchikanganisa hupenyu hwayo hwesevhisi. .Kune rumwe rutivi, apo pulse current capacitor ye capacitor bank yakaenzana neakaenzana pulse current inductor ye software software, kuwedzera kweharmonic current (2-10 times) kuchaita kuti capacitor iwedzere kupisa uye kuiparadza, uye iyo pulse current ichaita kuti kuwanda kwesimba rekubuda richinje.Iyo sinusoidal waveform yabuda mufuremu, zvichiita kuti isaha-zino-rakapinza wave wave, uye inokonzeresa kuburitswa kwechidimbu cheiyo insulating layer zvinhu, nekudaro ichimhanyisa kukwidziridzwa kweiyo insulating layer zvinhu, uye kukonzeresa kukuvadza kune capacitor.Naizvozvo, iyo capacitor reactive power compensation cabinet haigone kushandiswa kuinverter simba remuripo, uye sefa ine pulse current suppression function inofanirwa kusarudzirwa low-voltage reactive power compensation.

Sefa reactive simba muripo wekurapa chirongwa
Zvinangwa zveutongi
Dhizaini yemafirita muripo wemidziyo inosangana nezvinodiwa zveharmonic kudzvinyirira uye reactive simba kudzvinyirira manejimendi.
Pasi peiyo 0.4KV sisitimu yekushandisa modhi, mushure meiyo sefa yekubhadhara midziyo yaiswa mukushanda, iyo pulse ikozvino inodzvinyirirwa, uye mwedzi wepakati simba chinhu chiri kutenderera 0.92.
High-order harmonic resonance, resonance overvoltage, uye overcurrent inokonzerwa nekubatanidza kune sefa muripo webazi redunhu hazvizoitiki.
Dhizaini Inotevera Mitemo
Hunhu hwesimba Public grid harmonics GB/T14519-1993
Simba remhando Voltage fluctuation uye flicker GB12326-2000
General tekinoroji mamiriro eyakaderera-voltage reactive simba muripo mudziyo GB/T 15576-1995
Low-voltage reactive power compensation device JB/T 7115-1993
Reactive simba muripo wehunyanzvi mamiriro JB/T9663-1999 "Low-voltage reactive power automatic compensation controller" kubva kune yakakwira-order harmonic yazvino muganhu kukosha kwe low-voltage simba uye zvemagetsi midziyo GB/T17625.7-1998
Electrotechnical mazwi Simba capacitors GB/T 2900.16-1996
Low voltage shunt capacitor GB/T 3983.1-1989
Reactor GB10229-88
Reactor IEC 289-88
Low-voltage reactive power compensation controller order tekinoroji mamiriro DL/T597-1996
Low-voltage magetsi enclosure giredhi yekudzivirira GB5013.1-1997
Yakaderera-voltage yakakwana switchgear uye kudzora midziyo GB7251.1-1997

pfungwa yekugadzira
Zvinoenderana nemamiriro ezvinhu ekambani, iyo simba factor uye pulse ikozvino kudzvinyirira inotariswa mune sefa muripo weiyo inverter magetsi, uye iyo yekutadza kusefa muripo wemidziyo yakaiswa pa 0.4kV yepasi voltage padivi re transformer, iyo inogona kudzvinyirira. iyo pulse ikozvino uye inobhadhara kuvandudzwa kwesimba chinhu.
Mukushandura, ballast inogadzira 6K-1 advanced pulse currents zvinoenderana neFourier series yazvino kuyerera, uye yobva yagadzira 5 advanced pulse currents, imwe neimwe ingangoita 250Hz uye 7350Hz.Naizvozvo, kana uchigadzira reactive simba muripo wepakati ma frequency induction furnaces, zvinodikanwa kugadzira ma frequency akatenderedza 250Hz uye 350Hz kuve nechokwadi chekuti sefa yekubhadhara bazi rinokwanisa kudzvanya pulse currents, kudzosera mitoro inoshanda panguva imwe chete, uye kugadzirisa simba chinhu.

dhizaini basa
Iyo yakazara simba chinhu cheiyo paired inverter magetsi tambo ye2000kV AC transformer inobhadharwa kubva pa0.8 kusvika 0.95.Iyo sefa yemuripo wemidziyo inofanirwa kuve nevhoriyamu ye760kV, uye yoshandurwa otomatiki kuita 8 seti yemavhoriyamu, uye imwe seti inobatana nemubhadharo wemhepo padivi revoltage rezasi retransformer.Basa rekugadzirisa kirasi ndeye 45KVAR, iyo inogona kusangana nemhando dzakasiyana dzemagetsi emagetsi ekugadzira.Iyo yakazara simba chinhu cheiyo 630kV transformer paired converter mutsara yakabhadharwa, uye muripo wemuripo unobva pa0.8 kusvika 0.95.Iyo sefa yemuripo wemidziyo inofanirwa kuve ine 310kV vhoriyamu, iyo inoshandurwa otomatiki kuita mana seti mavhoriyamu, uye imwe seti inobatirana neanopopotera resistor pazasi voltage padivi retransformer kuti muripo.Basa rekugadzirisa kirasi ndeye 26KVAR, iyo inogona kusangana nemhando dzakasiyana dzemagetsi emagetsi ekugadzira.Iyo dhizaini dhizaini inovimbisa zvizere kuti iyo simba chinhu chinodarika 0.95.

Effect analysis mushure mekuiswa kwefirita muripo
Muna Chikunguru 2010, inverter yekusefa reactive simba rekubhadhara mudziyo yakaiswa uye yakaiswa mukushanda.Chishandiso chinoteedzera otomatiki shanduko yekuchinja kweiyo inverter, inodzvanya yakakwira-odha maharmonics munguva chaiyo, inotsiva reactive simba, uye inovandudza simba chinhu.mashoko sezvinotevera:

Mushure mesefa yekubhadhara mudziyo waiswa mukushandiswa, iyo simba factor inoshandura curve mushure mekunge sefa yekubhadhara mudziyo waiswa mukushandiswa ingangoita 0.97 (iyo yakasimudzwa chikamu chingangoita 0.8 kana mudziyo wemuripo wesefa wabviswa)

Rodha kushanda
Ikozvino inoshandiswa ne2000KVA transformers yakaderedzwa kubva ku2500A kusvika ku2120A, kudonha kwe15%;ikozvino inoshandiswa ne 630KVA transformers yakaderedzwa kubva ku770A kusvika ku620A, inodonha ye19%.Mushure memuripo,thepowerlossreductionvalueisWT=△Pd*(S1/S2)2*τ*[1-(cosφ1/cosφ2)2]=50×{(0.85×4500)/4500}2×0.4≈34(kw h) Muchikamu formula, Pd ndiko kurasikirwa-pfupi-kutenderera kurasikirwa kweshanduko, inova 50KW, uye kuchengetedza kwegore kwemari yemagetsi i34*20*30*10*0.7=142,800 yuan (zvichienderana nekushanda maawa makumi maviri pazuva, mazuva makumi matatu pamwedzi. , Mwedzi gumi pagore, 0.7 yuan pakWh).

simba factor situation
Iyo kambani yemagetsi engineering index yakawedzera kubva pa0.8 kusvika 0.95, uye mwedzi wega wega engineering indekisi yakaramba iri pa 0.96-0.98, ichikwira kubva kupfuura 20,000 yuan pamwedzi kusvika kupfuura 6,000-10,000 yuan pamwedzi.
Iyo yakaderera-voltage reactive simba muripo weiyo frequency kutendeuka sefa ine kugona kudzvanya pulse ikozvino uye kubhadhara reactive mutoro, kugadzirisa dambudziko reiyo reactive simba chirango, kuwedzera simba rekubuda kweshanduko, kuderedza kurasikirwa kwesimba rinoshanda muripo, kuwedzera goho, uye kuunza mabhenefiti kukambani Zviri pachena mabhenefiti ehupfumi agadzirwa, uye mutengi wepurojekiti yekudyara isingasviki gore rimwechete rekutora purojekiti mari.Naizvozvo, kambani inogutsikana zvakanyanya neiyo reactive simba muripo weiyo inverter sefa, uye ichaunza vamwe vatengi mune ramangwana.