Tashidanta da dukkanin karamin barazan a wurare masu yawan darasi a kan cikin submarine cables ko overhead transmission line shine tashidanta da dukkanin karamin barazan. Wannan tsarin tashidanta ya fi shahara a kan HVAC tashidanta idan ana nemi abin da aka yi, mutum da manya da sauran abubuwa. Sunana Electrical superhighway ko Power superhighway suna amfani da su don HVDC.
Na'urar Tashidanta HVDC
An sani cewa karamin barazan AC an samun a cikin generating station. Hakan zai a rubuta zuwa DC. An yi wannan rubutu a kan cikin rectifier. Karamin barazan DC zai zama ta haɗa a kan cikin overhead lines. A kan cikin mai amfani, hakan zai a rubuta zuwa AC. Don hakan, inverter an ji a kan cikin receiving end.
Saboda haka, za a kasance rectifier terminal a kan cikin substation HVDC karkashin kofin kasa, inverter terminal a kan cikin karkashin kofin kasa. Zama ta Input Power da Output Power ba a kan cikin sending end da user end.
Idan akwai converter stations biyu a kan cikin karkashin kofin kasa da single transmission line suna nufin two terminal DC systems. Idan akwai converter stations biyu ko da yawa da DC transmission lines suna nufin multi-terminal DC substation.
Abubuwan da ke HVDC Transmission system da ma'adinito suna bayyana a nan.
Converters: An yi AC to DC da DC to AC conversion a kan cikin converters. Yana haɗa transformers da valve bridges.
Smoothing Reactors: Yana haɗa smoothing reactors a kan cikin har pole wanda suka haɗa inductors connected in series with the pole. Ana amfani da ita don gaba commutation failures occurring in inverters, reduces harmonics and avoids discontinuation of current for loads.
Electrodes: Su ne conductors which are used to connect the system to the earth.
Harmonic Filters: It is used to minimize the harmonics in voltage and current of the converters used.
DC Lines: It can be cables or overhead lines.
Reactive Power Supplies: The reactive power used by the converters could be more than 50% of the total transferred active power. So the shunt capacitors provide this reactive power.
AC Circuit Breakers: The fault in the transformer is cleared by the circuit breakers. It also used to disconnect the DC link.
Na'urar HVDC System Configurations
Classification of HVDC links are as follows:
Mono Polar Links
Single conductor is required and water or ground act as the return path. If the earth resistivity is high, metallic return is used.
Bipolar Links
Double converters of same voltage rating are used in each terminal. The converter junctions are grounded.
Homopolar Links
It consists of more than two conductors which is having equal polarity generally negative. Ground is the return path.
Multi Terminal Links
It is used to connect more than two points and is rarely used.
Comparison of both HVAC and HVDC Transmission System
Na'urar Tashidanta HVDC |
Na'urar Tashidanta HVAC |
Losses na gajeru. |
Losses suna da gajeru saboda skin effect and corona discharge |
Voltage regulation and Control ability na gajeru. |
Voltage regulation and Control ability na da gajeru. |
Transmit more power over a longer distance. |
Transmit less power compared to a HVDC system. |
Less insulation is needed. |
More insulation is required. |
Reliability is high. |
Low Reliability. |
Asynchronous interconnection is possible. |
Ba da kyau kuma kara mai rubutu!
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