The electrification of large commercial vessels is emerging as a complex but important pathway in the shipping industry’s transition toward
The electrification of large commercial vessels is emerging as a complex but important pathway in the shipping industry’s transition toward lower-emission operations.
According to HD Hyundai, while electric vehicles (EVs) have successfully entered the mainstream, the electrification of large-scale vessels remains a significant challenge. Unlike passenger cars, large commercial ships must carry tens of thousands of tons of cargo over vast distances for weeks at a time without the possibility of mid-voyage recharging. This requires not only extremely large energy storage systems but also a fundamental redesign of ship propulsion architecture.
To address these constraints, the shipbuilding industry is exploring systems that generate electricity from alternative energy sources such as hydrogen, natural gas, and ammonia to power propulsion motors. This approach reduces greenhouse gas emissions while also lowering vibration and noise levels.
Electrification in shipping can be broadly divided into three stages: power generation, power distribution and conversion, and propulsion.
Power generation
In the power generation phase, HD Hyundai is advancing an “energy mix power system” that combines dual-fuel engines (DFGE) with ammonia-based solid oxide fuel cells (SOFC).
DFGE systems provide operational flexibility by responding quickly to fluctuations in power demand, which is critical given the dynamic nature of propulsion loads and onboard energy requirements. SOFC systems, in contrast, generate electricity through electrochemical reactions that convert fuel directly into electricity without combustion.
According to the U.S. Department of Energy, this process reduces energy losses and improves overall efficiency compared to conventional engine or turbine systems. In addition to higher efficiency, SOFC technology offers a cleaner solution that supports compliance with increasingly stringent carbon regulations.
Power distribution and conversion
The second stage, power distribution and conversion, relies on medium-voltage direct current (MVDC) systems, which transmit electricity at voltages ranging from 1.5 kV to 100 kV. While alternating current (AC) has been the dominant standard since the historical “War of the Currents,” MVDC is emerging as a gamechanger in maritime applications.
It improves power conversion efficiency and reduces energy losses, with potential gains in integrated energy efficiency of up to 20% in large electric-powered vessels. HD Hyundai is actively developing MVDC technology in collaboration with the American Bureau of Shipping (ABS), including efforts to establish design standards and international regulatory frameworks following a memorandum of understanding signed in May 2024.
Propulsion
The final stage is propulsion, where medium-voltage propulsion drives based on modular multilevel converter (MMC) structures play a key role. These systems enable precise control of motor torque and speed, delivering high-quality voltage regulation and stable performance under demanding conditions, including ultra-low-speed operation and rapid acceleration or deceleration.
They are particularly well suited for vessels requiring low noise and vibration, such as naval ships engaged in covert operations, and also reduce detectability compared to conventional mechanical propulsion systems.
HD Hyundai has developed key propulsion drive technologies previously dependent on imports, achieving full localization of the electric propulsion platform across generation, distribution, and propulsion. Commercialization of this propulsion drive is planned for 2028.
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