Method for avoiding a power failure in an electrical grid

A method for preventing a power failure in at least one electrical subgrid which is connected to a transmission grid for supplying power to electrical consumers of the subgrid, wherein the electrical consumers of the subgrid are divided into a number of different groups of different priorities, the method comprising the steps of:

• calculating a total required reduction electrical current, by which the currently consumed total electrical current of all consumers of the subgrid is to be reduced in order to avoid a detected overload in the subgrid;
• determining a group target electrical current for each assigned group of consumers based on the total required reduction electrical current and a savable group electrical current that can be saved by the respective group;
• calculating target electrical currents for the electrical consumers of the assigned groups of the subgrid depending on the determined group target electrical current;
• and
• reducing the amount of electricity currently consumed by the consumers of the respective group until the determined group target electrical current for the respective group is reached,
• wherein, if a group of consumers, v, has been marked as a group that can be shut down (Allow to Shutdown), the electricity consumption of a consumer within the marked group is reduced to zero if the electricity consumption of the consumer falls below a minimum electrical current consumption ascribed to this consumer and
• wherein, after calculating the target electrical currents of the electrical consumers for each of the assigned groups of electrical consumers of the subgrid, starting with the group of electrical consumers with the lowest priority until the group of electrical consumers with the highest priority is reached, the currently consumed group electrical current by the electrical consumers of the respective group is mathematically reduced until the group target electrical current calculated for the respective group is reached.