Where smart ferry charging begins with a smart grid

Thursday, March 17, 2022

NORWAY: The Hareid-Sulesund ferry operations have reduced CO2 emissions by 7000 tonnes annually with the introduction of electric vessels. In transitioning ferries from diesel to pure electric power, powerful onshore support is essential, in the form of reliable infrastructure for rapid charging capacity and stable grid supply. The systems on board and on shore act as a single system – a sophisticated and competitive system developed by Norwegian Electric Systems (NES) using Danfoss technology.

7000 t less CO2

Norwegian Electric Systems AS (NES) is a total supplier of low-emission, sustainable energy design and smart control for a wide range of vessels globally. Discover how NES cut CO2 emissions by 7000 tonnes each year on the Hareid-Sulesund ferry route.

Charging 5MW in just six minutes

The electric ferry “Suloey” is about to dock at Hareid ferry terminal. The crossing from Sulesund has been made in strong headwind, with high electricity consumption during the crossing. Below decks, the electric ferry “Suloey” is equipped with propulsion, automation and charging systems from Norwegian Electric Systems (NES). “There is a need for proper charging after such a trip”, explains the captain of “Suloey”.

With a simple touch on the charging display, the fully-automated charging tower on shore connects to the ferry within a few seconds. Charging power close to five million watts ensures that the batteries on board are rapidly recharged.

After 6 minutes, the charging system disconnects and “Suloey” sets course over to Sulesund again. Suloey, together with her sister ferries Hadaroey and Giskoey, currently makes an important contribution to reducing maritime emissions. The transition from diesel-driven to all-electric ferries on the Hareid- Sulesund crossing ensures annual reduction in CO2 emissions by as much as 7,000 tonnes, based on 32,000 vessel charging sessions every year.

Calculations at both ferry terminals showed that the existing power grid required extra power to achieve the necessary charging power. NES strengthened the power grid on both sides, and retrofitted vessels with batteries and the newest converter and power control technology, for the optimal electric-powered solution.

The solution

NES and Danfoss have the answers to all these engineering challenges. Håvard Wolden from Danfoss explains: “The electric ferry charges 350 kWh of power in just 6 minutes. This scale of charging places stringent demands upon the smart grid onshore in Hareid and Sulesund, which supports reliable power supply for the electric vessel rapid charging system.

NES supplemented the onshore power supply with battery storage systems powered by Danfoss grid converters, to ensure adequate charging capacity and speed. The electricity used to supply the system is supplied from renewable sources, to minimize losses and optimize operating costs.“

Stabilizing voltage by feeding reactive power back to the grid

The charging stations at Hareid and Sulesund are operated by Norway’s largest ferry company, Fjord1. The charging system is based on the latest power conversion and transmission technology, developed by NES.

Onshore: The grid system is based on NES-built energy storage systems using VACON® NXP Grid Converter. During charging, the vessel accumulates 5 MW power, comprising 3 MW from the local AC grid and 2 MW from the combined power of onshore batteries.

On board: VACON® NXP Grid Converter in the machine room converts the shore AC-voltage to stable DC-voltage on board. A VACON® NXP DC/DC Converter charges the batteries from the onboard DC-grid.

NES supports the crew by remotely monitoring performance from Bergen, providing technical support if challenges arise. Operational data feeds continuously to a cloud-based solution, supplying the ferry operator Fjord 1 with a full overview of electricity consumption and operational performance.

The outcome

In total, the charging stations on this ferry route perform about 32,000 charging operations and transfer approximately 11200 MWh of electric power per year.

The systems on board and on shore are fully integrated. When the ferry approaches the charging station, information about the energy consumed on the trip is communicated to the shore station. The system also checks the power grid and compensates to ensure no voltage disturbances arise. The charging system is designed to minimize voltage disturbances, feeding reactive power back to the grid during charging to maintain stable grid voltage. This in turn enables the local grid to deliver even more energy during charging of the vessel.

By actively controlling, monitoring, and supporting the grid from local batteries on shore side, the system supplies the high peak power crucial to rapid charging, with no need to scale up grid infrastructure. Instead of extra capital investment, the system relies on peak shaving functionality.

Peak shaving optimizes the energy flow between the incoming supply and local onshore storage to meet spikes in demand without disrupting the supply grid. Excess energy is stored when demand and electricity prices are low.

Reducing port emissions

Discover how shore supply systems equipped with VACON® NXP Grid Converter help port authorities meet emission targets

Products

Power conversion case studies

  • if (isSmallPicture) { ; } else if (isBigColumns) { } else { }
    Generating energy from green waste to fuel a city

    AUSTRALIA: Jeffries Group supports the city of Adelaide by using the biochar byproduct of green waste to generate renewable energy, drivens by VACON power conversion. There's enough power to run their entire green waste operation and feed surplus energy back into Adelaide’s power grid—with zero emissions.

  • if (isSmallPicture) { ; } else if (isBigColumns) { } else { }
    Where smart ferry charging begins with a smart grid

    NORWAY: The Hareid-Sulesund ferry operations have reduced CO2 emissions by 7000 tonnes annually with the introduction of electric vessels. In transitioning ferries from diesel to pure electric power, powerful onshore support is essential, in the form of reliable infrastructure for rapid charging capacity and stable grid supply. The systems on board and on shore act as a single system – a sophisticated and competitive system developed by Norwegian Electric Systems (NES) using Danfoss technology.

  • if (isSmallPicture) { ; } else if (isBigColumns) { } else { }
    Unique heat recovery for geothermal power using VACON® drives

    AUSTRALIA: In arid outback Australia the borewater pumped up from underground is so hot, it needs cooling before you can drink it. The town of Winton in Queensland has turned this to its advantage by converting heat from the bore water to electricity. A geothermal power station recovers energy during the borewater cooling process then uses it to generate power for the local community, with the help of VACON®drives.

  • if (isSmallPicture) { ; } else if (isBigColumns) { } else { }
    Royal IHC Scheldt River pioneers new environmental standards in dredging with flexible MV drives

    A Danfoss medium-voltage drive solution boosts an inboard dredge pump and increases energy efficiency with a small footprint, minimum weight and low volume - while being robust enough to withstand the harsh marine environment.

  • if (isSmallPicture) { Zygfryd Glaeser, Professor in Theology at the University of Opole in front of solar panels; } else if (isBigColumns) { Zygfryd Glaeser, Professor in Theology at the University of Opole in front of solar panels } else { Zygfryd Glaeser, Professor in Theology at the University of Opole in front of solar panels }
    Kneipp-Institute leads the way in storing renewable energy

    An institute in Kamień Śląski, Poland, is pioneering climate neutral energy consumption. Danfoss helps store electricity from the sun. Savings on electricity bill and CO2 emissions are the main drivers.

  • if (isSmallPicture) {  Alfen energy storage enables the energy grid of the future; } else if (isBigColumns) {  Alfen energy storage enables the energy grid of the future } else {  Alfen energy storage enables the energy grid of the future }
    Alfen energy storage enables the energy grid of the future

    Electrification and hybrid solutions are now booming. One of the first pioneers was the Dutch based energy storage manufacturer Alfen B.V., which has used Danfoss power conversion equipment since the early days.