Hybridization

  • Improve performance by making better use of energy

    Hybridization at a glance

    A simple and broad definition of hybridization is any system with two or more sources of energy acting together to accomplish a task. Perhaps the most commonly recognized form of hybridization today is a hybrid vehicle where a conventional internal combustion engine propulsion system is combined with an electric propulsion system to create a ‘hybrid’ power train. The benefits of hybridization, in this instance, are fuel savings, performance improvements and reduced emissions.

    In the world according to Danfoss Drives, the definition of hybridization can be summed up by introducing a means of energy storage into a system. Hybrid solutions are implemented primarily for at least one of three reasons:

    • Reduce or defer capital expenses (CAPEX)
      • avoid over-dimensioning a system
      • defer investment in infrastructure  
    In over-supply situations, the hybrid system can direct energy toward storage. When demand levels are high, the storage medium can be accessed to provide an additional source of energy;

    • Reduce operating expenses (OPEX)
      • improve system efficiency
      • increase system availability  

    Hybrid systems can increase system efficiency and avoid power outages caused by grid quality problems;

    • Decrease downtime of the system by increasing robustness in the case of power-quality issues

    Key benefits of energy storage

    Energy storage provides greater stability in power production systems by facilitating peak shaving for incoming power, time shift for production and back-up power in emergency situations. 
    Hybridization of systems is expected to continue to increase significantly across a wide cross section of land- and sea-based industry and commercial sectors, especially due to the reduction of battery costs and increases in energy density.

    Danfoss Drives hybrid solutions

    Energy storage is often described as a key enabler for integrating renewable energy into power generation. However, Danfoss is widening the scope of energy storage and developing solutions that also focus on the optimization of energy consumption. By equipping both machines and entire processes with energy storage systems, it is possible to significantly improve power quality and upgrade performance and overall efficiency.

    Danfoss Drives products for hybridization can be utilized in many applications:

    Integration of renewable energy sources

    • Energy production forecasting
    • Peak shaving
    • Time shift of production
    Grid stability – ancillary services
    • Frequency regulation/inertia emulation
    • Spinning reserves
    • Overload ability/boosting
    • Fast starting/reacting
    μGrids
    • Peak power compensation on a substation-level
    • Back-up power in disturbance situations
    Efficiency
    • Energy production optimization in co-operation with diesel and LNG generators
    • Consumption optimization of loads in marine environment
    • Clean energy in harbors
    Ecology
    • Clean energy in harbors
    • Time shift, integration of renewable power supplies
    Availability of electrical power
    • Uninterrupted power supply to, for example, telecommunications, airports and hospitals
    Land construction and mining
    • Local energy production, typically diesel gensets, operation optimization with batteries 
    • Machine hybridization

    Features and benefits of the Danfoss hybrid solutions

    One stop shop: Reduce procurement costs – Air- and liquid-cooled drives, AFE, NFE, INU, DC/DC, Grid Converter, DC Modules and components are available from one source
    Wide power range: Reduce variants – solutions are available for applications in a kW to MW range
    Modular solution: Based on the VACON® NXP platform power modules, the DC bus system can be easily configured
    Wide voltage range: Increase flexibility – Ability to integrate a wide variety of common battery bank voltages using a DC/DC converter
    Flexibility: Easy to upgrade – The simple-to-extend VACON® NXP platform provides great system flexibility with a low additional investment
    Scalability: Solutions can be scaled up to meet future energy requirements in terms of new energy sources, additional storage or to meet increasing demand
    Serviceability: Lower investments – Utilizing the same VACON® NXP hardware configurations, service teams require little to no additional training
    Industry and application knowledge: Made to last – Liquid- and air-cooled solutions based on in-depth application knowledge for the most demanding industries
    Open approach: Faster Go-To-Market – Wide range of applications made available as foundation for building tailored solutions
    Partnership: Stronger together – System integrators collaborate with a vendor who has a vested interest in their success

    Hybrid configurations

    There are two primary approaches to adding energy storage to applications. The first is over a common AC bus and the second is a common DC bus. Both solutions have their advantages depending on the application.

    Energy storage directly connected to the AC grid using a grid converter

    This reduces the component count and size of the system and improves efficiency.

    DC/DC converter connected between the DC link and the energy storage

    This brings the load power/energy support close to the consumption, provides different storage voltage/technology adaptations, increases expandability and enables the battery stack to be replaced due to aging.

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