Mune yazvino DC transmission system, chete chinongedzo chekutumira ndiDC, iyo chizvarwa system uye yevatengi sisitimu ichiri AC. Pakupera kwekutumira mutsara wekutumira, iyo AC simba kubva kuAC sisitimu inotumirwa kune inogadzirisa kuburikidza neinoshandura shanduko muchiteshi chekushandura. Iyo inoshandura iyo yakakwira-voltage AC simba kuita yakakwira-voltage DC simba uye inotumira kune iyo DC transmission line..
Iyo DC simba inotumirwa kune inverter mune inoshandura chiteshi panzvimbo yekugamuchira kuburikidza nemutsetse wekutumira, iyo inoshandura iyo high-voltage DC simba kuita a high-voltage AC magetsi tambo. Uye wobva waendesa simba kuAC system kuburikidza neshanduko inoshandura. MuDC transmission system, iyo inverter inogona kuitwa kuti ishande mune yakagadziridzwa kana inverted mamiriro nekudzora inoshandura.
HVDC Transmission ine akawanda mabhenefiti achienzaniswa neAC Transmission
1. HVDC tambo yekufambisa ine hupfumi zvakanyanya. Pakutumira simba rimwechete, waya inoshandiswa muDC transmission lines chete 1/2 kuti 2/3 yeiyo inoshandiswa mukufambiswa kwe AC. DC transmission line inoshandisa maviri-waya system uye ichienzaniswa neye-tatu-waya system, matatu-chikamu AC kutapurirana, pasi pemamiriro akafanana ekutapurirana tambo waya muchinjiko-chikamu uye ikozvino density. Kana iyo ganda mhedzisiro isingatariswe, iyo tambo yekutapurirana uye insulation zvinhu zvinogona kuponeswa nezve 1/3 yesimba remagetsi rimwechete.
Kana ganda rinoshanda uye kurasikirwa kwakasiyana-siyana kunotorwa, nzvimbo yemuchinjikwa-chikamu chewaya inoshandiswa kufambisa simba rimwechete AC yakakura kudarika kana kuenzana nayo 1.33 nguva iyo mhiri-chikamu nharaunda yewaya inoshandiswa pakufambisa kweDC. Saka, waya inoshandiswa pakufambiswa kweDC inokwana hafu yeinoshandiswa kufambisa AC.
Mumitsara yekufambisa tambo, high-voltage DC transmission mitsetse usaite capacitive currents, nepo AC transmission mitsetse ine capacitive currents, izvo zvinokonzera kurasikirwa. Pane dzimwe nguva dzakakosha, sekuti kana mutsetse wekutapurirana uchipfuura nemu strait, DC tambo dzinofanirwa kushandiswa.
Nekuda kweiyo coaxial capacitor yakaumbwa pakati petambo core uye pasi, iyo no-load capacitive current yakanyanya kuwanda muAC high-voltage transmission line. MuDC transmission line, hapana capacitive ikozvino yakawedzerwa kune tambo nekuti iyo voltage fluctuation idiki kwazvo.
3. Kana DC kutapurirana kunoshandiswa, iyo AC system pamigumo yese yemutsara haidi kuti imhanye zvinoenderana, nepo AC kutapurirana kunofanira kumhanya synchronously. Kana kureba AC kutapurirana kunoshandiswa, pane mutsauko wakakosha muchikamu chemagetsi kumativi ese eiyo AC transmission system.
Zvinhu zviviri izvi zvinoita kuti iyo AC system isawirirane uye inoda kugadziriswa neyakaoma uye yakakura muripo system uye tekinoroji yakazara.. Neimwe nzira, yakasimba loop ikozvino inogona kuumbwa mumidziyo uye kukuvadza midziyo, kana kukonzera kudzima nekuda kwekushanda kusina kuwiriraniswa.
Kana DC mitsetse yekufambisa ichishandiswa kubatanidza maviri AC masisitimu, iyo AC gidhi pamigumo yese inogona kushanda panguva yavo uye chikamu pasina synchronous kugadzirisa.
4. HVDC simba rekufambisa sisitimu iri nyore kudzora uye nekukurumidza, uye kurasikirwa kana kukundikana kudiki pane iyo ye AC kutapurirana. Kana maviri AC masisitimu akabatana ne AC mitsetse, apo a pfupi dunhu zvinoitika kune rumwe rutivi rwegadziriro, rumwe rutivi runofanira kuendesa pfupi-circuit ikozvino kudivi rekukanganisa.
Saka, kugona kwevatambi vedunhu vekutanga pamativi ese ehurongwa kugura iyo pfupi-yedunhu ikozvino ichatyisidzirwa uye mabreaker edunhu anoda kutsiviwa.. Kana iwo maviri AC masisitimu akabatana neDC yekufambisa tambo. Simba redunhu rinogona kugadziriswa nekukurumidza uye nyore nekuda kwekushandiswa kwesilicon-controlled devices, iyo pfupi-yedunhu ikozvino inounzwa neDC transmission line kune pfupi-circuited AC system haisi yakakura. Uye iyo pfupi-yedunhu ikozvino yekukanganisa side AC system inenge yakafanana kana pasina yekubatanidza. Saka, hazvidikanwi kutsiva shanduko yepakutanga uye ikozvino-inotakura michina kumativi ose maviri.
5. Muchirongwa chekufambiswa kweHVDC, danda rimwe nerimwe rinozvimiririra uye rinoshanda pasina pesvedzero kubva kune mumwe.
Saka, kana danda rimwe rakundikana, danda rakatadza chete ndiro rinoda kuvharwa uye rimwe danda rinogona kuendesa zvishoma 50% yesimba. Zvisinei, mune AC transmission line, kukanganisa kwechigarire mune chero chikamu chinofanira kukonzera kupera kwemutsara wakakwana.
