Two-gigawatt high-voltage direct current (HVDC) transmission systems are rapidly becoming a standardized, off-the-shelf product rather than a bespoke engineering solution, according to Cornelis Plet, CTO of Grid Systems Integration at GE Vernova. This commoditization marks a structural shift: the hardware for moving bulk power over long distances is now mature and repeatable, but the surrounding grid — protection schemes, control architectures, planning tools, and market rules — remains designed around alternating current assumptions.
The implication is that transmission developers and system operators can now specify 2 GW converter stations with the same confidence they once reserved for 500 kV AC lines. GE Vernova’s own portfolio reflects this, with multiple projects in execution that treat 2 GW as a building block rather than a frontier. Yet the industry’s institutional muscle memory — relay settings, fault-ride-through requirements, stability studies — still defaults to AC behavior, creating integration friction every time a new HVDC link connects to the synchronous grid.
This mismatch is most acute in protection coordination. HVDC converters respond to faults in milliseconds, not cycles, and their current-limiting behavior differs fundamentally from synchronous machines. Existing distance relays and differential schemes can misoperate or fail to see faults behind a converter station. Grid codes are evolving, but unevenly across jurisdictions, leaving developers to negotiate custom solutions that erode the cost savings of standardization.
Planning tools face a parallel lag. Production-cost models and stability simulations traditionally represent HVDC as a simple power transfer, ignoring the dynamic voltage support, frequency response, and black-start capabilities modern voltage-source converters provide. Until those capabilities are natively modeled, planners will undervalue HVDC’s system benefits and overbuild AC alternatives. The hardware race has been won; the software and institutional catch-up now determines how fast the energy transition can use it.
Read the full report at CleanTechnica
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