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Table of Contents
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Etrel INCH DUO charging station supports many functionalities that can help with overload prevention, frequency regulation, power management of one charger or power management of a cluster of chargers.
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Figure 1: Etrel INCH DUO charging station
All OCPP 1.6 SOAP is fully supported and all messages and methods of OCPP 1.6 JSON are also supported. The full support of OCPP 2.0 JSON is upcoming.
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The charging station can operate on its own, however, it can be beneficial to use additional data at the location where possible. For example, data of household consumption and data of possible production of energy at the location, can be measured and transmitted to the charging device where the data is evaluated, analysed and used in algorithms. One possibility for this is the collection of data with the use of Etrel Load Guard. Additional measurements enable better operation of smart charging.
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Figure 2: Etrel Load Guard
Back Office (Software Solutions)
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Power management
Cluster management
Demand response activation
Load area power management
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Figure 3: Etrel Ocean
2. Smart Charging Solutions at the Location
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When the user connects EV to charger, and prior to beginning of charging, the charger determines the current available for charging as the difference between the rated current of main fuse (reduced by a safety margin that can be pre-set by the user via charger’s web interface) and the last measurement received from Load guard.
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Figure 4: Use of household consumption data to prevent overload
By using Load Guard device, the household load can be measured and used in overload prevention algorithms:
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Table is showing an example of defined stages of frequency regulation and setting of one stage in charging station’s web interface is shown at the figure below.
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Figure 5: Setting of one stage of frequency regulation
The settings of under-frequency regulation are usually defined by local distribution system operator and can be a requirement or only a recommendation. All the frequency regulation settings are defined by the circumstances at the actual location, local legislation, and requirements.
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This is done to minimize the possibility of overloading the grid or connection point during the communication failure. If this is not done problems can especially occur when new EVs arrive to charging station during the time with no communication with software back office. If there are other (unmanageable) loads in your cluster, then software solution cannot perform cluster power management.
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Figure 6: Managing of cluster from back office
Larger cluster (up to 300 electric vehicles) is possible with use of industrial computer and connection to Etrel Ocean management software.
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Charging station can be part of multiple load areas. One load area that represents a big part of the electrical grid, can have multiple small sub load areas, where only one or few charging stations can be in one of them. The limitation of currents can be set on the level of load area and level of sub-load areas independently. Example of load areas can be seen on the following figure.
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Figure 7: Load area and sub load areas
How load areas and sub load areas are arranged and how the operator then manages power can be set completely arbitrarily. Power can be managed for the whole load area LA1 or only for each sub area (LA 2, LA 3 and LA 4) separately.
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