Petrochemical plant case

Ruzivo rwekutanga rwevashandisi
A petrochemical plant inonyanya kugadzira zvigadzirwa zvegasi.Midziyo yemagetsi inoshandiswa nekambani inorodha mutyairi wemutyairi, uye dhizaini yekugovera ndeye 2500 kVA.Iyo dhizaini yemagetsi system dhizaini ndeiyi inotevera:

Data chaiyo yekushandisa
Simba rose reiyo frequency converter ye2500KVA transformer i1860KVA, avhareji simba chinhu PF = 0.8, uye kushanda ikozvino 2400-2700A.

Simba System Situation Analysis
Kiyi kune inverter simba rekupa mutoro weiyo rectifier inverter simba rekupa mutyairi, iyo ndeye discrete system mutoro.Zvishandiso zvinogadzira akawanda eharmonics panguva yekushanda, inova yakajairika harmonic sosi.Iyo harmonic yazvino yakaunzwa mugedhi remagetsi inokonzeresa harmonic yekushanda voltage pane hunhu impedance yegidhi remagetsi, zvichikonzera kushanduka kwemagetsi ekushanda uye ikozvino yegidhi remagetsi, zvichiisa mungozi kunaka uye kuchengetedzwa kwekushanda kweiyo magetsi system, kuwedzera kurasikirwa kwemutsara uye kukanganisa kwemagetsi ekushanda, uye kukonzera kukuvadza kwakakomba kune grid remagetsi uye zvidyarwa zvekugadzira.Midziyo yayo yemagetsi, kunyanya iyo yechinyakare reactive simba rekubhadhara kabati inokonzeresa mhedzisiro, uye zviri nyore kukonzera harmonic vibration, zvichikonzera kukanganisa kumidziyo yemagetsi senge capacitor makabati.Naizvozvo, yakaderera-voltage reactive simba rekubhadhara sefa ine harmonic kudzvinyirira basa inofanirwa kusarudzwa kudzvanya system harmonics, kubhadhara reactive mitoro, uye kunatsiridza simba chinhu.

Sefa reactive simba muripo wekurapa chirongwa
Zvinangwa zveutongi
Sefa muripo wemidziyo yakagadzirirwa kusangana nezvinodiwa zvekudzora kudzvinyirira kweharmonics uye reactive simba.
Pasi peiyo 0.4KV system yekushanda modhi, mushure mekunge sefa yemuripo wemidziyo yasiya fekitori, iyo harmonic kudzvinyirira iri pamusoro pe0.92 paavhareji pamwedzi simba chinhu.

Usakonzere harmonic resonance kana resonance overvoltage uye overcurrent nekuda kwekupinza sefa muripo webazi.
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 rekubhadhara tekinoroji 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.
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 simba muripo
Mudzori anoraira tekinoroji mamiriro DL/T597-1996
Low-voltage magetsi enclosure giredhi yekudzivirira GB5013.1-1997
Low-voltage switchgear uye controlgear magungano

Mazano ekugadzira
Zvinoenderana nemamiriro ezvinhu chaiwo ebhizinesi, kambani yedu inonyatso tarisa simba remutoro uye kudzvanywa kweharmonic mufirita isingaite muripo weiyo inverter, uye inoisa iyo sefa isingaite muripo mudziyo pa 0.4KV yakaderera-voltage padivi rebhizimusi rekushandura, iro inodzvinyirira iyo harmonics uye inotsiva kuwedzera kwesimba rinoshanda.simba chinhu.
Panguva yekushanda kwefrequency converter, ichaita 5 nguva dze250HZ, 7 nguva dze350HZ uye mamwe ma-harmonics epamusoro.Naizvozvo, pakugadzira iyo sefa isingashande muripo weiyo inverter, inofanirwa kuve nechokwadi chekuti sefa yekubhadhara bazi redunhu rinogona kudzvanya maharmonics uye kubhadhara risingashande simba rema frequency pamusoro pe250HZ uye 350HZ kuvandudza simba chinhu.

dhizaini basa
Iyo yakazara simba chinhu cheiyo inverter magetsi ekugadzira mutsara inofananidzwa neimwe 2500 kVA transformer inobhadharwa kubva 0.8 kusvika 0.92.Filtration mudziyo muripo wemidziyo inofanirwa kuiswa ine huwandu hwe900 kWh.Kugona kwemapoka gumi nerimwe echikamu-kutsemuka kunofananidzwa nemamhepo ari pazasi voltage padivi retransformer kuti ibatanidzwe uye ibviswe otomatiki.Iyo yemhando yekugadziridza kugona ndeye 45KVAR, iyo inogona kusangana neakasiyana emagetsi zvinodiwa zvevanyoro kutanga uye mitsara yekugadzira.Iyi mhando yedhizaini inovimbisa zvizere kuti iyo yakagadziriswa simba chinhu yakakwira kupfuura 0.95.

Effect analysis mushure mekuiswa kwefirita muripo
Muna Chikumi 2011, iyo inverter sefa reactive simba rekubhadhara mudziyo yakaiswa uye yakaiswa mukushanda.Chishandiso chacho chinongoteedzera shanduko yekuchinja kweiyo inverter, pakarepo inodzvanya iyo yakakwira-yakarongeka pulse ikozvino kubhadhara reactive mutoro, uye inovandudza simba chinhu.mashoko sezvinotevera:

Mushure mesefa yemuripo mudziyo waiswa mukushandiswa, iyo simba factor shanduko curve inenge 0.98 (iyo yakasimudzwa chikamu chingangoita 0.8 kana mudziyo wemuripo wesefa wabviswa)

Rodha kushanda
Iko kushanda ikozvino kwe2500KVA transformer yakaderedzwa kubva ku2700A kusvika ku2300A, uye chiyero chekuderedza i15%.Mushure mekubhadhara, kukosha kwekuderedza kurasikirwa kwesimba ndeyeWT=△Pd*(S1/S2)2*τ*[1-(cosφ1/cosφ2)2]=24×{(0.85×2000)/2000}2×0.4≈16 (kw h) Mune fomula, Pd ndiko kurasikirwa-pfupi-yedunhu kurasikirwa kweshanduro, iyo iri 24KW, uye kuchengetedza kwegore kwemari yemagetsi i16 * 20 * 30 * 10 * 0.7 * 2 = 134,000 yuan (zvichienderana nekushanda makumi maviri maawa pazuva, mazuva makumi matatu pamwedzi, uye mwedzi gumi pagore , 0,7 yuan pakWh).

simba factor situation
Iyo kambani yakakwana yemagetsi chinhu yakawedzera kubva ku0.8 kusvika 0.95 mwedzi uno, uye iyo simba chinhu ichachengetwa pa0.96-0.98 mumwedzi unotevera, uye mubairo uchawedzerwa ne5000-6000 yuan muna Ndira.
Kazhinji, iyo yakaderera-voltage reactive simba muripo weiyo yakapfava yekutanga sefa ine yakanakisa kugona kudzvanya pulse ikozvino uye kubhadhara reactive simba, kugadzirisa dambudziko re reactive simba chirango chekambani, kuwedzera kubuda kwevhoriyamu yetransformer, uye kuderedza. simba rinoshanda Kuwedzerwa kushandiswa kwechigadzirwa kwakawedzera kuburitsa, kwakaunza mabhenefiti ehupfumi kukambani, uye kudzoreredza mari yemutengi mukati megore rimwe.Naizvozvo, iyo yakapfava yekutanga sefa reactive simba muripo wakagadzirwa nekambani inogutsa kwazvo, uye inokwezva vatengi vazhinji mune ramangwana.