Isiteshi sokuguqula i-HVDC

Isiteshi esincane, indawo lapho i-voltage ishintshwa khona.Ukuze udlulisele amandla kagesi akhiqizwa isikhungo samandla endaweni ekude, i-voltage kufanele

kwandiswe futhi kushintshwe ku-voltage ephezulu, bese i-voltage kufanele yehliswe njengoba kudingeka eduze nomsebenzisi.Lo msebenzi wokwenyuka nokwehla kwamandla kagesi

igcwaliswe yisiteshi esincane.Imishini eyinhloko yesiteshi esincane yi-switch kanye ne-transformer.

Ngokwesilinganiso, ezincane zibizwa ngokuthi iziteshi.Isiteshi esincane sikhulu kunesiteshi esincane.

Isiteshi esincane: ngokuvamile isiteshi esincane esehlayo esinezinga likagesi elingaphansi kuka-110KV;Isiteshi esincane: kufaka phakathi iziteshi “zokwenyukela phansi kanye nezokwehla” ze

amazinga kagesi ahlukahlukene.

I-Substation iyindawo yamandla ohlelweni lwamandla eguqula i-voltage, yamukele futhi isabalalise amandla kagesi, elawula ukuqondiswa kwamandla

ukugeleza nokulungisa i-voltage.Ixhuma igridi yamandla kuwo wonke amazinga kagesi nge-transformer yayo.

I-substation inqubo yokuguqulwa kwezinga le-voltage ye-AC (i-voltage ephezulu - i-voltage ephansi; i-voltage ephansi - i-voltage ephezulu);Isiteshi sokuguqula yi-

ukuguqulwa phakathi kwe-AC ne-DC (AC kuya ku-DC; DC kuya ku-AC).

Isiteshi sokulungisa kabusha kanye nesiteshi sokuguqula i-HVDC sibizwa ngokuthi iziteshi zokuguqula;Isiteshi esilungisa kabusha siguqula amandla e-AC sibe amandla e-DC

okukhiphayo, futhi i-inverter station iguqula amandla e-DC abuyele emandleni e-AC.Isiteshi sokuguqula i-back-to-back ukuhlanganisa isiteshi sokulungisa kabusha kanye ne-inverter

esiteshini sokudluliswa kwe-HVDC esiteshini esisodwa sokuguqula, bese uqedela inqubo yokuguqula i-AC ibe yi-DC bese kuba i-DC iye ku-AC endaweni efanayo.

Izinzuzo zesiteshi sokuguqulela

1. Uma udlulisela amandla afanayo, izindleko zolayini ziphansi: Imigqa yokudlulisa phezulu kwe-AC ngokuvamile isebenzisa amakhondatha angu-3, ​​kuyilapho i-DC idinga kuphela u-1 (isigxobo esisodwa) noma 2.

(double pole) amakhondaktha.Ngakho-ke, ukudluliswa kwe-DC kungasindisa izinto eziningi zokudlulisela, kodwa futhi kunciphise izindleko eziningi zokuhamba nezokufaka.

2. Ukulahlekelwa kwamandla asebenzayo aphansi kolayini: ngenxa yokuthi kusetshenziswa i-conductor eyodwa noma ezimbili kulayini ongaphezulu we-DC, ukulahleka kwamandla asebenzayo kuncane futhi “kunomthamo wesikhala”

umphumela.Ukulahleka kwayo kwe-corona kanye nokuphazamiseka komsakazo kuncane kunolayini ongaphezulu we-AC.

3. Ifanele ukudluliselwa kwamanzi ngaphansi kwamanzi: ngaphansi kwezimo ezifanayo zezinsimbi ezingezona ezoni kanye nezinto zokuvikela, i-voltage evumelekile yokusebenza ngaphansi kwe-DC

cishe izikhathi ezi-3 ngaphezu kwalokho ngaphansi kwe-AC.Amandla adluliswa intambo yekhebula le-DC enama-cores ama-2 makhulu kakhulu kunalawo adluliswa ulayini wekhebula le-AC no-3.

ama-cores.Ngesikhathi sokusebenza, akukho ukulahlekelwa kokungeniswa kazibuthe.Uma isetshenziselwa i-DC, ngokuyisisekelo kuphela ukulahlekelwa kokumelana nocingo oluyisisekelo, nokuguga kokufakelwa.

nayo ihamba kancane, nempilo yesevisi inde ngokuhambisanayo.

4. Ukuzinza kwesistimu: Kuhlelo lokudlulisa i-AC, wonke ama-generator ahambisanayo axhunywe ohlelweni lwamandla kufanele agcine ukusebenza okuhambisanayo.Uma umugqa we-DC

isetshenziselwa ukuxhuma izinhlelo ezimbili ze-AC, ngoba ulayini we-DC awunakusabela, inkinga yokuqina engenhla ayikho, okungukuthi, ukudluliswa kwe-DC akunqunyelwe

ibanga lokudlulisela.

5. Ingakwazi ukukhawulela umjikelezo omfushane wamanje wesistimu: lapho uxhuma amasistimu amabili e-AC nemigqa yokudlulisa ye-AC, umjikelezo omfushane wamanje uzokwanda ngenxa

ukwanda komthamo wesistimu, okungase kudlule umthamo wokunqamuka okusheshayo kwesiphazamisi sokuqala, esidinga ukushintshwa kwenani elikhulu lemishini kanye

ukwandisa inani elikhulu lokutshalwa kwezimali.Izinkinga ezingenhla azikho ekudlulisweni kwe-DC.

6. Isivinini sokulawula okusheshayo nokusebenza okuthembekile: Ukudluliswa kwe-DC kungalungisa kalula futhi ngokushesha amandla asebenzayo futhi kubone ukuguqulwa kokugeleza kwamandla nge-converter ye-thyristor.

Uma kwamukelwa umugqa we-bipolar, lapho isigxobo esisodwa sihluleka, enye isigxobo isengasebenzisa umhlaba noma amanzi njengesekhethi ukuze iqhubeke nokudlulisa ingxenye yamandla, okubuye kube ngcono.

ukwethembeka kokusebenza.

Isiteshi sokuguqulela emuva ukuya emuva

Isiteshi sokuguqula i-back-to-back sinezici eziyisisekelo zokudluliswa kwe-HVDC okujwayelekile, futhi singabona ukuxhumana kwegridi okungavumelaniyo.Uma kuqhathaniswa ne

ukudluliswa kwe-DC okujwayelekile, izinzuzo zesiteshi sokuguqula i-back-to-back zivelele kakhulu:

1. Awukho ulayini we-DC futhi ukulahlekelwa ohlangothini lwe-DC kuncane;

2. I-voltage ephansi kanye nemodi yokusebenza yamanje ephezulu ingakhethwa ngasohlangothini lwe-DC ukuze kuncishiswe izinga le-insulation ye-converter transformer, i-valve yokuguqula nokunye okuhlobene.

imishini kanye nokunciphisa izindleko;

3. I-harmonics ye-DC side ingalawulwa ngokuphelele ehholo le-valve ngaphandle kokuphazamiseka kwemishini yokuxhumana;

4. Isiteshi sokuguqula asidingi i-electrode eyisisekelo, isihlungi se-DC, isibambisi se-DC, inkambu yokushintsha i-DC, inkampani yenethiwekhi ye-DC kanye nezinye izinto zokusebenza ze-DC, ngaleyo ndlela konga utshalomali.

uma kuqhathaniswa nokudlulisa okujwayelekile kwe-high-voltage DC.