Ved at bekræfte knappen "Tillad alle cookies" tillader du brugen af cookies. Ved at klikke på knappen ”Konfigurer” kan du vælge hvilke cookies du ønsker at tillade. Du kan til hver en tid ændre eller ophæve din tilladelse i vores privatlivspolitik.
Dynamic load management
Dynamic load management distributes the maximum available network connection current evenly among the connected electric vehicles. This allows the operation of a multiple charging points from a limited network connection. The charging power of individual charging points can be reduced, in order not to exceed the maximum load, or the load can be distributed across various phases.
There are two main ways to supply a charging infrastructure:
Optimal load management is based on the appropriate performance of the grid connection, use of phase rotation when connecting the charging point, and appropriate configuration of the charging network. In a load network, one of the charging points always assumes the coordination function. All other charging points in the network communicate with this coordinator and regulate the power to be supplied accordingly. Communication takes place via the network using LAN or WLAN.
Use Cases
Car park with multiple charging stations
Charging of all connected electric vehicles (EV) at full charging power until the rated current of the fuse (max. current of the supply line) is reached. As soon as another vehicle needs to charge, the charging currents are evenly distributed among all vehicles. This prevents critical overloading of the supply line. As soon as the end of a vehicle's charging process is detected, the power thereby becoming available is redistributed among all the vehicles still charging. The charging stations communicate with each other via wired Ethernet or wireless WLAN.
Multiple charging stations in a single network (WLAN/LAN), but various DLM networks
Various DLM networks can also be set up, which are located in the same data network. This is useful, for example, if only certain charging stations are to communicate with a common backend. The charging stations communicate with each other within their DLM network with or without cable via Ethernet or WLAN respectively. The LAN or WLAN is identical for all DLM networks.
Wallbox charging group and external consumer readings captured by energy meters
The load management ensures that the total of the charging currents in a charging group does not exceed the capacity of the network connection line. Up-to-date information on power consumption by external loads is captured by means of an additional external energy meter. The coordinator wallbox is, for example, connected via Modbus TCP with the meter and regularly requests the current level of consumption by the external consumers. Accordingly, the meter must be capable of communicating with an Ethernet interface and TCP/IP protocol. The coordinator subtracts the values transmitted by the meter from the network connection current limit set ("Current limit for load management") and makes the resulting remaining current evenly available to the charging group.
Wallbox charging group and external consumers, with the overall consumption by the system captured by one energy meter
The total of the charging currents in a DLM network should not exceed the capacity of the network connection line. The capture of up-to-date loads at the building connection is by means of an additional external energy meter that covers the entire system. The coordinator wallbox is, for example, connected via Modbus TCP with the external meter and regularly requests the current level of consumption at the energy meter. Accordingly, the meter must be capable of communicating with an Ethernet interface and TCP/IP protocol. The coordinator regulates the individual charging currents so that the measured value of the energy meter does not exceed the network connection current limit set ("Current limit for load management"). The remaining current available is evenly fed to the charging group
Control by an external energy management system (EMS)
In this case, the wallboxes in the charging group have communication interfaces allowing connection to an intelligent energy management system. This controls all system inflows and outflows and directs the group. Accordingly, either each charging station individually or the charging group as a whole can be control by the EMS.
