Kudzora Voltage muSistimu dzeMasimba
Kudzora voltage mumagetsi ibasa rekuchengetedza mazinga evoltage panzvimbo dzakasiyana-siyana munetwork—kubva pakugadzirwa, kutapurirana, kugoverwa, uye kunyange mutengi—mukati memiganhu inogamuchirika. Voltage yakaderera zvakanyanya (undervoltage) kana yakakwira zvakanyanya (overvoltage) inogona kuderedza mhando yemagetsi, kuwedzera kurasikirwa, kukurumidzisa kukwegura kwemidziyo, uye kutokonzera kukuvara kwesystem. Nekuti mitoro yemagetsi inogara ichichinja-chinja, kudzora voltage ndeimwe yemabasa akakosha mukushanda kwemagetsi emazuva ano.
Sei Voltage Ichifanira Kudzorwa?
Zvakanaka kuti vatengi vagamuchire voltage iri pedyo ne nominal value (semuenzaniso, 220/380 V padivi rakaderera) pasina kutsauka kukuru. Mumamiriro ezvinhu chaiwo, kusiyana kwemutoro, nzvimbo ye conductor, uye network configuration zvinokonzera kudzikira kwe voltage mu tambo. Sezvo mutoro uchiwedzera, current inowedzera, nokudaro zvichiwedzera kudzikira kwe voltage mu tambo impedance. Kusiyana neizvi, pasi pemitoro yakareruka kana kana simba re reactive rakawandisa rikaiswa, voltage inogona kuwedzera.
Kukanganiswa kwemagetsi asina kuenzana kwakapararira zvikuru. Semuenzaniso, ma induction motors anodhonza magetsi akawanda kana magetsi akadzikira kuti arambe aine torque, zvichiita kuti apise zvakanyanya uye zvigone kukurumidzisa kutadza kushanda. Mumasystem emwenje, magetsi mashoma anodzima marambi, nepo magetsi akawanda achipfupisa hupenyu hwawo. Midziyo yemagetsi inonetsa inodawo magetsi akagadzikana kuti ishande nemazvo. Kune zvishandiso, kutsauka kwemagetsi kunogona kuwedzera kurasikirwa kwemagetsi, kuderedza kushanda zvakanaka, uye kuwedzera zviratidzo zvemhando yemagetsi.
Pfungwa Dzekutanga: Simba Rinoshanda uye Mbiri Yemagetsi
Chinhu chikuru chekudzora voltage musystem yemagetsi ndechekutarisira simba rekuita (VAR). Kazhinji, kufamba kwesimba rekuita (reactive power flow) kunokanganisa zvakanyanya mazinga emagetsi, kunyanya muma network ane reactance-dominant impedance (senge mitsetse yekutumira). Kana system isina simba rekuita (reactive power), voltage inowanzo kudzikira. Kana system iine simba rekuita (reactive power) rakawandisa, voltage inowanzo kukwira.
Hukama uhwu hunowanzotsanangurwa neV-Q curve: shanduko mukuisa VAR kana kunyudzwa mubhazi zvinochinja voltage yebhazi. Nokudaro, vazhinji vanogadzirisa voltage vari kushanda vanoshanda sevanodzora VAR, kungave nekugadzira, kunyudzwa, kana kudzora kupararira kwavo munetwork.
Mitemo yeVoltage neMiganhu
Mitemo yehunyanzvi inowanzo taura kushivirira kwemagetsi chaiwo panzvimbo dzekutumira vatengi. Munzira dzakawanda dzekugovera, shanduko dzinobvumirwa dzinotangira pa ±5% kusvika ±10% yemutengo wezita, zvichienderana neyakajairwa uye chikamu chemutengi. Munzira dzekutumira, miganhu yemagetsi pamabhazi makuru inodzorwawo zvakanyanya nekuti inokanganisa kugadzikana kwekushanda uye kuchengetedzeka.
Kuwedzera kune steady-state values, vashandi vanocherechedzawo zviitiko zve transient voltage zvakaita sekudzika (kudonha kwevoltage kwenguva pfupi), kuzvimba (kuwedzera kwenguva pfupi), uye kudzima. Kunyange zvazvo chinyorwa chino chichinyanya kutaura nezve steady-state voltage regulation, zvishandiso zve fast voltage regulation zvinogonawo kubatsira kuderedza matambudziko aya anochinja-chinja.
Nzira dzeKudzora Voltage neMidziyo
Kudzora voltage kunoitwa pamatanho akasiyana-siyana, uchishandisa musanganiswa wezvishandiso zvinotevera.
1) Sisitimu yeKusimudzira Jenareta (Automatic Voltage Regulator/AVR)
Pachigadzirwa chemagetsi, AVR inodzora simba rekuburitsa magetsi rejenareta rinopindirana kuti ridzore voltage yayo. Nekuwedzera kuburitsa magetsi, jenareta inogona kupa simba rinoita basa rakawanda, nokudaro ichiwedzera voltage yesystem. Nekuderedza kuburitsa magetsi, jenareta inotora maVAR uye inoderedza voltage. Mhinduro yeAVR inokurumidza uye inoshanda senzira huru yekudzivirira mukuchengetedza voltage pachigadzirwa chemagetsi netambo dzemagetsi dziri pedyo.
Zvisinei, mashandiro ejenareta anoganhurirwa nekakombama kekugona kushanda kane chekuita nemiganhu yekupisa ye stator/rotor uye miganhu yekugadzikana. Saka, kudzorwa kwemagetsi hakufanirwe kumanikidza jenareta kushanda kupfuura miganhu yayo yakachengeteka.
2) Transformer ine On-Load Tap Changer (OLTC)
Mumasisitimu ekutumira nekuparadzira, matransformer eOLTC anobvumira shanduko muhuwandu hwekutenderera uku transformer ichiramba ichishanda. Nekuchinja pombi, voltage yechipiri inogona kukwidzwa kana kuderedzwa kuti voltage irambe iripo pane imwe feeder kana bhazi.
MaOLTC anoshanda zvikuru pakubhadhara mitoro yezuva nezuva, asi mhinduro yawo haisi yekukurumidzira semidziyo yemagetsi ine simba. Uyezve, kuchinja-chinja pombi nguva nenguva kunogona kukurumidzisa kupera kwemuchina pamagetsi anochinja pombi. Nokudaro, vanodzora veOLTC vanowanzova ne "deadband" uye kunonoka kwenguva kudzivirira "kuvhima" panguva yekuchinja kudiki.
3) Shunt Capacitors uye Shunt Reactors
Ma capacitor e shunt anoiswa mu network kuti ape simba re reactive remunharaunda, nokudaro zvichideredza reactive current inofanira kuyerera kubva kure. Mugumisiro wacho kudzikira kwe voltage, kudzikira kwe IR kurasikirwa, uye kuwedzera kwe load-end voltage. Ma capacitor anowanzo shandiswa mu distribution (capacitor banks) uye transmission.
Kusiyana neizvi, ma "shunt reactors" anoshandiswa kupinza simba rakawandisa re "reactive", semuenzaniso pamitsetse mirefu, ine mutoro wakareruka inosangana ne "Ferranti effect" (kuwedzera kwemagetsi ekugamuchira). Ma "reactors" anobatsira kuchengetedza kuwedzera kwemagetsi mukati memiganhu.
Ma capacitor nema reactor zvinogona kugadziriswa kana kushandurwa uchishandisa ma circuit breaker anodzorwa otomatiki zvichienderana ne voltage, power factor, kana schedule.
4) SVC neSTATCOM (Inochinjika uye Inokurumidza)
Mumasystem emazuva ano, zvishandiso zveFACTS zvakaita seSVCs (Static VAR Compensators) uye STATCOMs (Static Synchronous Compensators) zvinopa muripo weVAR unokurumidza uye unoenderera mberi. MaSVCs anoshandisa thyristors kudzora reactance inoshanda, nepo maSTATCOMs achishandisa voltage source inverter (VSC) kupinza reactive current inodzorwa.
Chinhu chikuru chinobatsira pakushandisa mudziyo uyu ndechekuti unopindura nekukurumidza, izvo zvinobatsira zvikuru pakutsungirira kudonha kwemagetsi kamwe kamwe, kugadzirisa kugadzikana kwemagetsi, uye kubatsira sisitimu kugadzirisa matambudziko kana kuchinja kwemutoro mukuru.
5) Kudzora Voltage muDistribution: Kudzora Voltage uye Kudzora Mutoro
Muma network ekugovera magetsi ari pakati nepakati, ma voltage regulators (autotransformers ane tap changers) anowanzoiswa pakati pema feeder kuti vachengetedze voltage yevatengi pakupera kwe network. Pamusoro pezvo, kugadzirisa network uye kugovera mutoro pakati pema feeder zvinogonawo kubatsira kuvandudza voltage profile.
Kudivi revatengi vemaindasitiri, kushandiswa kwema capacitor ekugadzirisa simba, mafirita e harmonic, kana zvishandiso zve dynamic compensation zvinogona kuderedza zvinodiwa neVAR zvegrid uye kuchengetedza voltage yemukati mefekitari yakagadzikana.
6) Basa reSimba Rinodzokororwa uye MaInverter Emazuva Ano
Kubatanidzwa kwezviteshi zvemagetsi zvinodzokororwa zve inverter (PLTS, PLTB) kuri kuchinja nzira inodzorwa nayo magetsi. Ma inverter emazuva ano anogona kupa VAR (Volt-VAR) kutonga uye kunyange Volt-Watt regulation kudzivirira overvoltage pama feeder ane PV yakakwira kupinda. Zvisinei, kubatana pakati pe inverters, OLTCs, uye capacitors kwave kwakaoma kudzivirira kutenderera kwemitemo kana zviito zvinopesana.
Kurongeka Kwekudzora Voltage
Kudzora voltage hakusi kungoshandisa mudziyo mumwe chete, asi kuronga michina yakawanda panguva dzakasiyana:
– Inokurumidza (mamirisekonzi-masekonzi): jenareta AVR, SVC/STATCOM, inverter control.
– Pakati nepakati (masekondi–maminitsi): kuchinja kwe capacitor/reactor, kugadzirisa voltage setpoint.
– Zvishoma nezvishoma (maminitsi–maawa): OLTC transformers, network reconfiguration, reactive generation dispatch.
Munzvimbo yekudzora, vashandi vanoongorora voltage yebhazi, kuyerera kwesimba rinoita basa, uye mamiriro emidziyo. Zvidzidzo zvekuyerera kwemutoro zvinoshandiswa kuronga nekuongorora mamiriro ekushanda. Mumasisitimu makuru, zvirongwa zvekudzora otomatiki zvakaita seAutomatic Voltage Control (AVC) kana Volt/VAR Optimization (VVO) zvinobatsira kuchengetedza voltage uku zvichideredza kurasikirwa kwesimba.
Dambudziko: Kugadzikana kweVoltage uye Kudonha kweVoltage
Imwe yenjodzi dzakakomba ndeyekudonha kwemagetsi, mamiriro ezvinhu apo sisitimu haigone kuchengetedza magetsi nekuda kwekushaikwa kwekutsigira kunoshanda, kazhinji mushure mekukanganiswa kana panguva yekuremerwa kwakanyanya. Kudzikira kwemagetsi, mitoro inodhonza magetsi akawanda, kudiwa kweVAR kunowedzera, uye kudzikira kwemagetsi kunowedzera kuipa—zvichiumba kutenderera kunogona kutungamira kudzimwa kwemagetsi kwakapararira.
Kudzivirira izvi kunoda nzvimbo dzakakwana dzekuchengetedza simba, kuiswa kwema compensators akakodzera, dziviriro yakarongeka, uye kutarisa margins ekugadzikana kwemagetsi (semuenzaniso nePV curve uye QV curve analysis).
Mhedziso
Kudzora voltage musystem yemagetsi kusanganiswa kwemaitiro ehunyanzvi uye ekushanda kuchengetedza mhando uye kuvimbika kwemagetsi. Chinhu chikuru chematambudziko evoltage chakabatana zvakanyanya nekutonga kwesimba remagetsi, saka zvishandiso zvakasiyana-siyana - maAVR ejenareta, matransformer eOLTC, macapacitor/reactors, maSVC/STATCOM, ma distribution regulators, uye ma renewable energy inverters - zvinoshandiswa kugadzira voltage profile yakachengeteka. Nekubatana kwakanaka, system yemagetsi inogona kushanda zvakanaka, yakadzikama, uye kukwanisa kutarisana ne load dynamics nematambudziko ekubatanidzwa kwesimba rinodzokororwa.
Kana muchida, ndinogona kuwedzera dhayagiramu yekudzora kuyerera kweVolt/VAR, muenzaniso wekuverenga kudonha kwemagetsi, kana shanduro yakazara yedzidzo yechimiro chechinyorwa chine zvirevo uye bibliography.
