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Which of the following section is more costly to setup HVDC link?
Converter Transformer
Civil Works Buildings
Valves
Engineering
Valves
In an HVDC transmission system, the converter station is the most capital-intensive component, and within the converter station, the valve assembly (comprising thyristors, cooling systems, and control electronics) accounts for the largest share of the cost. The valves are responsible for the high-speed electronic switching required for power conversion, utilizing sophisticated semiconductor technology that drives up the procurement and installation expenses compared to passive components like transformers or civil infrastructure.
In an HVDC transmission system, the converter station is the most capital-intensive component, and within the converter station, the valve assembly (comprising thyristors, cooling systems, and control electronics) accounts for the largest share of the cost. The valves are responsible for the high-speed electronic switching required for power conversion, utilizing sophisticated semiconductor technology that drives up the procurement and installation expenses compared to passive components like transformers or civil infrastructure.
PlossтАЛ=VdropтАЛ├ЧIdcтАЛ тАФ Power loss across valves
VvalveтАЛ=N├ЧVthyristorтАЛ тАФ Total voltage rating based on series-connected units
The HVDC converter valves act as high-speed static switches that perform rectification (AC to DC) and inversion (DC to AC). They are constructed as multi-level assemblies of series-connected high-power thyristor modules to handle multi-kilovolt transmission levels. Because they require complex gate drive circuits, high-voltage insulation, redundant protection levels, and intensive liquid-cooling infrastructure to dissipate switching losses, they constitute the most expensive segment of the converter station equipment.
Converter valves utilize series-connected thyristors to achieve high voltage blocking capabilities.
Cost involves not just the silicon, but redundant control, optical firing systems, and high-efficiency cooling.
Converter transformers are expensive but standardized compared to the complex, application-specific valve modules.
Efficient power control
Ability to connect asynchronous AC grids
High harmonic generation
Significant capital cost for conversion equipment
Long-distance bulk power transmission
Submarine power cables
Grid interconnections
A typical HVDC converter station cost breakdown allocates nearly 50% to the valve hall equipment.
Option B (Civil works) is significant but usually secondary to the highly specialized semiconductor and cooling infrastructure of the valves.
C is correct тАФ The converter valves represent the most expensive single component due to the complexity of power electronic switching modules and their integrated cooling/control systems.
In competitive exams, always remember that for HVDC, the 'Converter Station' is the most expensive part of the link, and 'Valves' are the most expensive part of that station.