System for designing a low-voltage distribution network at a secondary unit substation

A system comprising:

• a controller;
• and
• a 3-phase measurement sensor, wherein the 3-phase measurement sensor, at least for current measurement, is connected to a low-voltage feeder of a secondary unit substation,
• wherein a distribution network with producers and/or consumers is connected to the low-voltage feeder,
• wherein the controller and the 3-phase measurement sensor are arranged in the secondary unit substation,
• wherein the controller has a data interface for detecting electrical measurement values of the connected 3-phase measurement sensor with an associated timestamp,
• wherein the controller has a communication interface for connection to a higher-level unit outside the secondary unit substation,
• wherein the controller has a first memory area in a local memory for storing the measurement values with an associated timestamp,
• wherein the controller has, in the local memory, a second memory area for the storage of network topological data,
• wherein the network topological data has both line profiles of the distribution network and consumer profiles of the consumers and/or producer profiles of the producers of the distribution network,
• wherein the controller has a computing unit configured to:
• receive a request via the communication interface to output an energy flow in the distribution network;
• select a time period for measurement values with a timestamp within the time period;
• calculate values of the energy flow based on the network topological data and the measurement values of the time period;
• and
• provide a calculation result in a server of the controller for transmission via the communication interface,
• wherein the server of the controller is configured to provide the calculation results using graphical objects, the graphical objects comprising invariant graphical elements and time-varying graphical elements and the graphical objects being transmittable via the communication interface to the higher-level unit outside the secondary unit substation, and the controller is configured to provide control data to the secondary unit substation to control the energy flow in the distribution network based on the calculation results,
• wherein the secondary unit substation has a transformer connected to the low-voltage feeder for transformation between medium voltage and low voltage, and
• wherein the controller is configured to determine a most favorable voltage band and sets the transformer based on the most favorable voltage band.