The efficient transfer of bulk electrical power over long distances depends on HVDC power transmission technology, which offers lower losses and superior controllability compared to traditional AC transmission. Findings from WiseGuy Reports indicate that the Flexible HVDC Transmission System Market is projected to expand from USD 7.48 billion in 2025 to USD 14.2 billion by 2035, with HVDC power transmission representing the essential technology enabling renewable energy integration and grid interconnection.
Technology and Operating Principles
HVDC power transmission involves transferring bulk electrical power between two or more points using high voltage direct current, in contrast to high voltage alternating current that forms the backbone of most national grids . The process involves rectifying AC to DC at the sending end, transmitting the converted current over overhead lines, submarine cables, or underground cables, and then inverting it back to AC at the receiving end . The technology has been in commercial service since 1954, when the first modern HVDC link connected the Swedish mainland to the island of Gotland, and now operates across six continents with individual links transmitting several gigawatts .
Two primary converter technologies serve different applications. Line-commutated converter (LCC) technology, which uses thyristor valves, remains the standard for very high power ratings, with some modern links exceeding 8 GW . Voltage-source converter (VSC) technology, which replaced thyristors with insulated gate bipolar transistors (IGBTs), became commercially available in 1997 and is now the preferred approach for new projects below roughly 2 GW . Contemporary VSC systems use the modular multilevel converter (MMC) topology, which builds the AC waveform from the series operation of hundreds of individually controlled submodules, reducing harmonic content and allowing full black-start capability .
Economic Rationale and Infrastructure Savings
The economic rationale for HVDC power transmission depends on the balance between converter station costs and savings on transmission infrastructure. For long overhead routes, typically exceeding 600 to 700 kilometers, the reduced conductor losses and lower right-of-way requirements of a two-conductor DC line offset the capital cost of the converter equipment . For submarine and underground cables, the advantage appears at much shorter distances because AC cables generate reactive current that progressively consumes capacity along the cable length, whereas DC cables carry only active power .
DC systems do not require reactive power compensation, resulting in smaller voltage drops along transmission lines. As transmission distances increase, the economic benefits of HVDC surpass those of AC systems . HVDC enables the secure and stable interconnection of power networks that operate on different voltages and frequencies (asynchronous) or are otherwise incompatible .
Regional Development and Major Projects
Asia Pacific leads HVDC power transmission adoption, with India planning to add over 191,000 circuit kilometers of transmission lines and 1,270 GVA of transformation capacity during the 10-year period from 2022-23 to 2031-32 . The interregional transmission capacity is planned to increase to 143 GW by 2027 and further to 168 GW by 2032, from the present level of 119 GW .
Major HVDC projects in India include:
The Khavda-Nagpur HVDC link: ±800 kV, 6,000 MW, spanning 1,200 km
The Bhadla-Fatehpur link: 6 GW, 950 km
The Port Blair-Paradip undersea cable: ±320 kV, 250 MW VSC-based interconnection
In China, flexible HVDC transmission technology is applied in projects such as the Rongdong offshore wind farm, the multi-terminal flexible DC transmission projects in Zhoushan and Nan'ao, and the back-to-back DC transmission project in Lu Xi .
Grid Stability and Control Capabilities
Modern HVDC links operate with power electronic controls that can modulate transmitted power within tens of milliseconds, providing emergency power support following generation trips and damping inter-area oscillations in connected AC systems . HVDC provides enhanced stability, which is crucial for integrating renewable energy sources and managing dynamic grid conditions .
Multi-terminal DC networks, where three or more converter stations share a common DC voltage bus, extend these control benefits to wider areas . The digital control system is the brain of HVDC transmission systems, enabling high integration levels and managing all control and protection functions .
Industry Developments and Strategic Positioning
Recent industry developments highlight HVDC power transmission innovation. Hitachi Energy has been a key player in India's HVDC segment since the late 1980s, with an installed base exceeding 16,000 MW, representing over 50% of India's HVDC power transmission capacity . Hitachi Energy's factory in Chennai manufactures advanced power electronics for HVDC systems and exports to support global installations .
Future Outlook and Market Opportunities
The HVDC power transmission market benefits from favorable trends including renewable energy integration, urbanization, and the need for efficient bulk power transmission from remote generation sites to major load centres . City infeed projects address rising power demand in urban areas, while cross-border interconnections facilitate efficient power exchange and contribute to regional energy security .
Conclusion
HVDC power transmission serves essential functions in efficient long-distance energy transfer, with the flexible HVDC market projected to reach USD 14.2 billion by 2035. Insights published by WiseGuy Reports indicate robust growth driven by renewable energy expansion and grid modernization. The evolution toward more efficient, flexible HVDC systems will continue to support the global energy transition. For comprehensive analysis of market dynamics, competitive positioning, and growth opportunities, the Flexible HVDC Transmission System Market report provides essential insights for energy professionals.
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