Jirgin Karamin Kirki na Gwamnati

Takaitaccen Tushen HVDC

Tushen HVDC yana nufin tushen karamin kasa da kasa a tsakiyar daɗi na juyin mafi girma ta hanyar kablayoyi masu mutanen ko kayayyakin da suka dace.

 Gidaje da Kompoonenti

Sistem tushen HVDC ya yi amfani da gidajensu da invertero wajen gida AC zuwa DC kuma kadan, da kompoonenti masu kyau kamar smoothing reactors da harmonic filters don inganta cin bayanai da kuma rage karfi.

 Sistem tushen HVDC

Na sani cewa karamin kasa AC ana faru a makarantar tushen. Wannan ya kamata zama DC. Gidaje ake yi waɗanda an yi wannan. Karamin kasa DC za ci gaba da kayayyakin da suka dace. A gaban mai amfani, wannan DC ya kamata zama AC. Don haka, ana shirya inverter a gaban mai amfani.

 Saboda haka, za ce akwai gidaje terminal a tsakiyar HVDC kuma inverter terminal a tsakiyar. Kirkiro kuɗi na gaban da mai amfani ba za mu bude ba (Kirkiro Kuɗi na Gaban = Kirkiro Kuɗi na Mai Amfani).

 Idan akwai biyu converter stations a duk tsakiyar da kaya sabuwar tushen, wannan yana nufin two terminal DC systems. Idan akwai biyu ko fiye converter stations da kaya sabuwar tushen, wannan yana nufin multi-terminal DC substation.

Kompoonenti da abubuwan sistem tushen HVDC suna bayyana a nan.

Converters: Gidaje da invertero sun yi gida AC zuwa DC kuma kadan, da kuma transformers da valve bridges.

Smoothing Reactors: Duk pole na iya da smoothing reactors wadanda su ne inductors wadanda ake hashe da pole. Ana amfani da su don rage commutation failures wadanda ke faru a invertero, rage harmonics da kuma rage rarrabe current don loads.

Electrodes: Su ne conductors wadanda ake amfani don hashe sistem zuwa earth.

Harmonic Filters: Ana amfani da su don rage harmonics a voltage da current wadanda converters suke amfani.

 DC Lines: Su na iya zama cables ko kuma kayayyakin da suka dace.

Reactive Power Supplies: Reactive power wadanda converters ke amfani ya kamata zama da ɗaya ɗaya na ɗaya ɗaya na kirkiro kuɗi da aka fitowa. Saboda haka, shunt capacitors suke bayar wannan reactive power.

AC Circuit Breakers: Fault wadanda ke faru a transformer ke rage circuit breakers. Ana amfani da su kuma don rage DC link.

Link Types

• Mono-polar Link

• Bipolar Link

• Homopolar Link

 Ana buƙatar fadin karamin kasa ɗaya kuma water ko ground suke haɗa da return path. Idan resistivity na earth yana ɗauke, ana amfani da metallic return.

Ana amfani da double converters na ɗaya ɗaya na rating na voltage a duk terminal. Junctions converters suke rage ground.

 Su na iya zama da biyu ƙarin conductors wadanda suke da polarity ɗaya ɗaya na ɗaya ɗaya na ɗaya ɗaya na negative. Ground yana haɗa da return path.

Multi Terminal Links

Ana amfani da su don haɗa da biyu ƙarin points kuma ana amfani da ita har zuwa ɗaya ɗaya.

Dagamawa na HVAC da Sistem tushen HVDC

 Abubuwan Adalci

• Ana amfani da converters da small overload capacity.

• Circuit Breakers, Converters da AC filters suke ɗaya ɗaya, musamman don tushen da ƙarin daɗi.

• Babu transformers don rage level voltage.

• HVDC link yana ɗauke ɗaya ɗaya.

• Power flow babu yadda ake kontrola.

Amfani na Yawan Tsari

• Undersea da underground cables

• Interconnections na AC network

• Interconnecting Asynchronous system