hvdc light, a tool for transmission of electric power(1)
TRANSCRIPT
HVDC LIGHTHVDC LIGHT
A TOOL FOR TRANSMISSION OF ELECTRIC POWERA TOOL FOR TRANSMISSION OF ELECTRIC POWER
Sunday, January 18, 2015 V.J.I.T - Dept of EEE
SUBMITTED BY:SUBMITTED BY:J Saikrishna goud J Saikrishna goud
EEE EEE 08911A028608911A0286
CONTENTSCONTENTS
INTRODUCTION NEED FOR HVDC HVDC LIGHT CONVERTER STATION FEATURES OF HVDC LIGHT ADVANTAGES CONCLUSION REFERENCES
Sunday, January 18, 2015 V.J.I.T - Dept of EEE
INTRODUCTIONINTRODUCTION HVDC light is high voltage direct current
transmission system based on solid state voltage source technology.
Utilizes most advanced power electronics and semiconductors.
Power is transmitted via underground/undersea cables.
More efficient way of transmitting power over distances above ~50km.
Sunday, January 18, 2015 V.J.I.T - Dept of EEE
Need for HVDCNeed for HVDC
HVDC stands for high voltage direct current, a well-proven technology used to transmit electricity over long distances by overhead transmission lines or submarine cables.
It is also used to interconnect separate power systems, where traditional alternating current (AC) connections cannot be used.
Sunday, January 18, 2015 V.J.I.T - Dept of EEE
HVDC light installationsHVDC light installations
Sunday, January 18, 2015 V.J.I.T - Dept of EEE
Power transformerPower transformer
The transformer is an ordinary single phase or three phase with a tap changer on the secondary side
The current in the transformer winding contains hardly any harmonics and is not exposed to any dc voltage
The transformer may be provided with a tertiary winding to feed the station auxiliary power system
Sunday, January 18, 2015 V.J.I.T - Dept of EEE
HVDC CablesHVDC Cables
Sunday, January 18, 2015 V.J.I.T - Dept of EEE
Advantages of HVDC cablesAdvantages of HVDC cables HVDC light cables are installed close in bipolar pairs with
anti parallel currents and thus eliminating the magnetic fields
They have no technical limitation for distance as in ac cables
Its strength and flexibility makes it well suited for several installation conditions
Sunday, January 18, 2015 V.J.I.T - Dept of EEE
Kinds of dc linksKinds of dc links Monopolar lines Bipolar lines Homopolar lines Line has one conductor and earth is used as return
conductor(mono) -ve Line has two conductors one +ve and one -ve(bipolar) Line have two or more conductor having same polarity
usually -ve
Sunday, January 18, 2015 V.J.I.T - Dept of EEE
Dc linksDc links
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Ground returnGround return
It uses t/m lines use ground or sea water as the return conductor
For the same length of the t/m line the resistance offered by the ground in case of dc is much less as compared to ac
Earth resistance in case of dc is independent of line length
Sunday, January 18, 2015 V.J.I.T - Dept of EEE
Advantages of HVDCAdvantages of HVDC Power per conductor is high and power per circuit is same Saving in insulation cost No stability problem Less corona loss No interference effect
Sunday, January 18, 2015 V.J.I.T - Dept of EEE
Power per conductor is highPower per conductor is high
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Power per circuit is samePower per circuit is same
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Less corona lossLess corona loss
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NEW HVDC PROJECT IN INDIA
Commissioning year:2015 Power rating:6 000 MW (multiterminal) AC voltage:400 kV (all stations) DC voltage:±800 kV Length of overhead DC line:1 728 km Main reason for choosing HVDC:Long
distance, bulk power
Sunday, January 18, 2015 V.J.I.T - Dept of EEE
SINGLE LINE DIAGRAM
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ConclusionsConclusions Opportunity to transmit small scale power long distances via
cable Opportunity to connect to passive load Separate control of active and reactive power No contribution to short circuit currents No need of fast communication Opportunity to operate without transformers Small and compact
Sunday, January 18, 2015 V.J.I.T - Dept of EEE
ReferencesReferences
1. Direct current transmission by Edward Wilson Kimbark
2.The ABCs of HVDC transmission technologies,IEEE Power and Energy Magazine,2006
Sunday, January 18, 2015 V.J.I.T - Dept of EEE
Thank youThank you
Sunday, January 18, 2015 V.J.I.T - Dept of EEE