Charging control of a fleet

A charging infrastructure for a plurality of electric vehicles of a fleet for providing electric exchange power of the plurality of electric vehicles for feeding into an electricity supply grid or drawing from the electricity supply grid, wherein:

• a positive exchange power denotes an electric power drawn from the electricity supply grid by the fleet, and
• a negative exchange power denotes an electric power fed into the electricity supply grid by the fleet,
• wherein each electric vehicle has an electrical storage unit having a changeable state of charge, and a charging terminal coupled to the electrical storage unit for charging or discharging the electrical storage unit of the electric vehicle, and
• wherein a sum of the changeable states of charge of the electric vehicles of the fleet, forms a changeable sum state of charge, the charging infrastructure comprising:
• a charging controller configured to actuate the charging terminals and determine a state of charge range for a provision period, the state of charge range spanning an operating range that contains the sum state of charge, wherein the state of charge range is delimited by:
• a time-dependent upper limit that specifies maximum values not to be exceeded for the sum state of charge in a time-dependent manner, and
• a time-dependent lower limit that specifies minimum values not to be dropped below for the sum state of charge in a time-dependent manner,
• wherein the charging controller is configured to:
• determine the state of charge range based on the states of charge of the plurality of electric vehicles,
• control the electric exchange power, for feeding into the electricity supply grid and drawing from the electricity supply grid, in the provision period such that the sum state of charge does not leave the state of charge range
• forecast a starting charging point of the state of charge range by determining a starting state of charge of the sum state of charge at a starting time,
• wherein the starting state of charge is forecast at the starting time, and/or
• wherein the starting time is forecast, such that:
• all of the plurality of electric vehicles have reached the charging infrastructure,
• a predetermined portion of the plurality of electric vehicles has reached the charging infrastructure,
• a number of electric vehicles of the plurality of electric vehicles have reached the charging infrastructure such that a sum of their states of charge has reached a specified minimum starting value of the sum state of charge, and/or
• a number of electric vehicles of the plurality of electric vehicles have reached the charging infrastructure that a sum of their storage capacities has a specified minimum storage capacity,
• assign an expected probability to the forecast starting charging point of the state of charge range, and
• assign an expected probability in each case to the forecast starting time, wherein:
• deviations between a forecast starting state of charge and a recorded sum state of charge are corrected, and
• a value of the starting charging point of the state of charge range for a predetermined availability is forecast as an availability value.

A method for providing electric exchange power for a plurality of electric vehicles of a fleet of electric vehicles for feeding into an electricity supply grid or drawing from the electricity supply grid by way of a charging infrastructure of the fleet, wherein the electric exchange power comprises:

• a positive exchange power that denotes an electric power drawn from the electricity supply grid by the fleet;
• and
• a negative exchange power that denotes an electric power fed into the electricity supply grid by the fleet;
• and wherein:
• each electric vehicle has an electrical storage unit having a changeable state of charge, and
• a sum of the changeable states of charge of the electric vehicles of the fleet forms a changeable sum state of charge, the method comprising:
• determining a state of charge range for a provision period, wherein the state of charge range spans an operating range that contains a sum state of charge, wherein the state of charge range is delimited by:
• a time-dependent upper limit that specifies maximum values not to be exceeded for the sum state of charge in a time-dependent manner, and
• a time-dependent lower limit that specifies minimum values not to be dropped below for the sum state of charge in a time-dependent manner,
• determining the state of charge range is based on the states of charge of the plurality of electric vehicles, and
• controlling the electric exchange power, for feeding into the electricity supply grid and drawing from the electricity supply grid, in the provision period such that the sum state of charge does not leave the state of charge range,
• wherein a charging controller of the charging infrastructure determines the state of charge range for the provision period based on forecast states of charge of the electrical storage units of the electric vehicles, wherein the provision period is in the future,
• wherein the state of charge range, a variation range, and/or an exchange rule is transmitted to a grid operator or a grid controller,
• wherein the grid operator or the grid controller specifies the exchange power for the provision period in the form of a temporal sequence or in the form of a prediction, based on the state of charge range, the variation range or the exchange rule,
• wherein the charging controller controls the exchange power in the provision period in accordance with the specified temporal sequence by appropriately actuating individual charging terminals or the individual charging terminals, and
• wherein additional active power and/or reactive power for regulating the electricity supply grid is offered to the electricity supply grid based on the state of charge range, the variation range and/or the exchange rule and the sum state of charge.