LET US INTRODUCEThe EnergyHub system

The EnergyHub system allows solar PV, energy storage and EV charging to be combined in a single system. The brain of the system, the EnergyHub automatically controls the energy flows between PV, energy storage, local loads and the utility grid. This control is made so that the economical benefit for the consumer is maximized.

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The brain in the system is the EnergyHub that can be used as a stand alone, but also communicates with all system components such as Solar PV, energy storage and EV charging in a DC-nanogrid.

With the EnergyHub in place, new DC devices can be added when required. The bidirectional inverter acts as a bridge between the utility AC grid and a local DC Nanogrid within the building.

Components
in the EnergyHub system

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EnergyHub optimizer
Smart and efficient use of DC energy
EnergyHub Energy Storage
Smart integrated energy storage is more than just a battery
Powerful DC-charger
Optimizes charging of electric cars
Scalable converter
2-way bridge between AC and DC power
DC-nano grid
Reduces power loss significantly
Solar string optimizer
Monitoring the PV string with MPP tracking to optimize output

All components of the system work with EnergyHub, which collects data and analyzes to balance and regulate the grid cost-optimally. It determines when it is appropriate to buy electricity and when it is better to use the homemade electricity stored in for example series-connected NiMH battery storage units. At the same time, EnergyHub uses ACE to balance power between the phase conductors to increase the headroom between the mains fuse rating and the loads.

Customer benefits

Scalable
One of many advantages with the EnergyHub system is the scalability, it can be built for any power demand by adding power modules until the desired capacity is reached.

EnergyHub is available in a wall mounted enclosure in two versions, Wallhub 7 kW and Wallhub 14 kW. Furhermore in a 19“ rack system named EnergyHub XL scaling from 21 kW to 1 MW. This design topology makes it possible to build systems suitable for any application, ranging from larger roof-top installations to commercial MW solar plants.

This design offers higher redundancy as production can be maintained in case of a single module failure. The modules can easily be replaced in the field with minimal influence on system output.
Grid fee reduction
Consumers that have a power based grid fee can benefit from a local energy storage by reduced grid fees. The model with a power based grid fee is getting acceptance as it better reflects the actual costs of operating the grid. The consumer will typically pay a fee proportional to the single highest hourly power peak each month. Since these peaks have short durations, they can easily be suppressed using a rather small energy storage. The power based grid fee can then be reduced by 50% in a typical household. For a single family home in Sweden this translates to an annual saving of 200 – 400 EUR.

Benefits for the Grid Company

The EnergyHub can also bring benefits to Grid companies (Distribution System Operators, DSOs) and Balance Responsible Parties (BRPs), by allowing spare capacity in the EnergyHub to be utilized for grid supporting services. This is done through a Virtual Power Plant (VPP), which will allow cost effective and large-scale utilization and integration of solar energy. In a VPP, several small power plants are controlled together enabling the distribution of electricity from locations of oversupply to places where there is demand.

Several EnergyHubs can participate in a Virtual Power Plant operated by a utility. This brings several benefits to utilities such as deferring other grid investments, massive redundancy and control and monitoring of the LV grid.

Reduced balancing costs
Forecast errors in production and consumption are typically covered by balancing power that needs to be purchased at a high price. Balancing costs can be reduced by charging or discharging the battery in the EnergyHub on demand.
Improved grid stability
As the share of renewables increase, it will be increasingly difficult to maintain the grid voltage and frequency within acceptable limits. Active power from the battery in the energy hub can be used to stabilize the grid frequency. Reactive power from the inverter can be used to stabilize the grid voltage. In addition the EnergyHub can be used to improve the power quality be removing harmonics, increase the hosting capacity for renewables and be a tool for monitoring and control of the LV grid.
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