Yuav Ua Li Cas Siab -voltage Series Reactors daws qhov teeb meem Harmonic Pollution hauv Rail Transit Fais Fab Systems?

Nyob rau hauv kev thauj mus los ntawm kev siv hluav taws xob hluav taws xob, high voltage series reactor thiab capacitor banks bank tsim cov ntxaij lim dej kom zoo daws teeb meem kev sib raug zoo. Lub ntsiab mechanism thiab kev siv cov ntsiab lus yog raws li nram no:
I. Qhov chaw thiab kev phom sij ntawm cov pa phem
Harmonics nyob rau hauv rail transit fais fab mov systems feem ntau yog muab los ntawm rectifier units (xws li 24-pulse rectifier nyob rau hauv traction substations). Txawm hais tias ntau yam - cov txheej txheem mem tes tuaj yeem txo qis kev sib haum xeeb, hauv kev xyaum tseem yuav muaj 5, 7 thiab 11 tus yam ntxwv sib haum xeeb, nrog rau cov yam ntxwv tsis sib haum xeeb tshwm sim los ntawm asymmetry ntawm daim phiaj fais fab. Harmonics tuaj yeem ua rau:
Capacitor overheating thiab puas: harmonic tam sim no nce capacitor poob thiab accelerates rwb thaiv tsev laus.
Harmonic amplification thiab resonance: Capacitors thiab grid inductive reactance tuaj yeem tsim cov kab hluav taws xob resonant uas ua kom muaj kev sib haum xeeb tshwj xeeb thiab ua rau muaj kev nyab xeeb ntawm cov khoom siv.
Relay tiv thaiv tsis ua haujlwm: Kev cuam tshuam ntawm kev sib raug zoo tuaj yeem ua rau muaj kev tiv thaiv sib txawv, kev tiv thaiv kev deb, thiab lwm yam, thiab cuam tshuam rau kev ruaj ntseg.
ii. Txoj Cai Ua Haujlwm ntawm High-Voltage Series Reactors
High voltage series reactor suppresses harmonics raws li hauv qab no:
Hloov cov yam ntxwv impedance ntawm lub system: thaum nyob rau hauv series nrog ib tug capacitor, lub LC lim ceg yog tsim. Nws impedance yog induced ntawm ib tug tshwj xeeb harmonic zaus, tiv thaiv harmonic tam sim no ntws mus rau hauv lub capacitor bank.
Piv txwv li, rau 5 harmonics (250Hz), lub capacitor ceg yog inductive rau 5 harmonics thaum lub resistivity raug xaiv ntawm 6% kom tsis txhob resonance.
Inrush tam sim no: Thaum lub capacitor txuas nrog lub hwj chim, qhov inductance ntawm lub reactor inhibits tam sim no inrush tam sim no, tiv thaiv lub switching ntaus ntawv thiab lub capacitor nws tus kheej.
Frequency Division Filtering: los ntawm kev kho tus nqi reactance (piv txwv li, 4.5%, 6%, 12%), cov harmonics tseem ceeb xws li peb thiab tsib theem tuaj yeem lim tawm. Piv txwv li:
6% reactance tus nqi: Siv tau zoo ntawm 5 harmonics thaum tiv thaiv 3 harmonics amplification.
12% reactance tus nqi: Haum rau hnyav peb -theem kev sib kis kab mob sib kis, xws li substations nrog loj ib zaug -theem nonlinear loads.
III. Tej kev siv ntawm rail transit
Piv txwv li, ib tug metro 110kV substation:
Txheej Txheem Txheej Txheem: Ob lub tsev txhab nyiaj tshiab 2400kvar capacitor tau teeb tsa nrog cov reactors series (144kvar) nrog 6% reactivity npaum li cas.
Tom qab kev debugging, tag nrho voltage distortion tus nqi ntawm 10kV busbar mus txog 4.33% (4% saum toj kawg nkaus qhov txwv), ntawm qhov thib peb harmonic distortion tus nqi yog 3.77%% (3.2% saum toj no qhov txwv).
Kev tsom xam teeb meem: Thawj qhov kev xaiv tus nqi reactance tsis suav tag nrho rau hauv tus account lub hauv paus kev sib haum xeeb, ua rau peb qhov kev sib haum xeeb.
Kev suav qhia tias lub peev xwm capacitor nyob ze rau 5.1% ntawm lub busbar luv luv - Circuit Court muaj peev xwm nyob rau hauv 6% reactance, thiab nws yog ib qho yooj yim los ua kom sib npaug resonance.
Optimization Measures: tus nqi reactance hloov mus rau 12% thiab cov harmonic impedance recalculation:
Qhov thib peb harmonic voltage amplification tus nqi yog txo mus rau 0.50, uas ua tau raws li tus qauv.
Qhov no zam qhov kev pheej hmoo ntawm resonance thiab txwv cov excitation inrush.
IV. INTRODUCTION Technical Parameters and Selection Principles
Reactance Ratio Xaiv:
3rd Harmonic Predominant: Xaiv qhov 12% reactance piv los pab kom lub capacitor ceg kom paub qhov thib peb harmonic.
5th Harmonic Predominant: Xaiv 6% reactance piv rau qhov sib npaug pom kev ua tau zoo thiab tus nqi.
General Scenarios: A 4.5% reactance ratio tuaj yeem tswj kev sib haum xeeb ntawm qhov loj ntawm 5 thiab siab dua.
Rated Voltage thiab muaj peev xwm:
Qhov ntsuas hluav taws xob yuav tsum ua raws li qhov system voltage (piv txwv li . 10kV, 35kV).
Rated peev yog xam los ntawm kev sib npaug ntawm qhov muaj peev xwm los ntawm qhov sib piv reactance (xws li . 144 kW=2,400 kW x 6%).
Cov qauv thiab cov ntaub ntawv: Epoxy- cov coils tau siv zog thiab cov tub ntxhais tuaj yeem tuaj yeem ua kom ntseeg tau tias qhov kub thiab txias tsis tshua muaj suab nrov.
Silicone roj hmab vibration roj hmab damping ncoo yog tsim rau compact qhov chaw ntawm kev tsheb ciav hlau.
V. Kev nqis tes ua thiab kev coj ua hauv kev lag luam
Harmonic Mitigation Effectiveness: Tom qab kho tus nqi reactance, qhov thib peb harmonic distortion tus nqi subway substation txo los ntawm 3.77% mus rau 2.8% thiab tag nrho cov distortion tus nqi txo mus rau 3.9%, mus txog GB / T 14549-1993 tus qauv.
Capacitor tsis ua hauj lwm tus nqi txo los ntawm 80%, ncua kev pab cuam lub neej ntawm cov cuab yeej.
Kev Lag Luam trends: Dynamic them nyiaj ua ke nrog Active power filters (APF) daws qhov kev sib tw ntawm kev sib raug zoo ntawm kev sib raug zoo.
Kev soj ntsuam kev txawj ntse tuaj yeem taug qab kev sib haum xeeb hloov hauv lub sijhawm tiag tiag thiab ua kom zoo dua reactor parameter hloov cov tswv yim.