EP2686813A1

EP2686813A1 - Methods and apparatuses for allocating amounts of energy

Info

Publication number: EP2686813A1
Application number: EP12730167.9A
Authority: EP
Inventors: Christian Glomb; Jörg Heuer; Richard Kuntschke; Martin Winter
Original assignee: Siemens AG
Current assignee: Siemens AG
Priority date: 2011-06-24
Filing date: 2012-05-30
Publication date: 2014-01-22
Also published as: WO2012175297A1; DE102011078045A1; US20140222235A1; US9577434B2

Abstract

The present invention relates to methods and apparatuses for allocating amounts of energy for prosumers, wherein the prosumers provide minimum and maximum amounts of energy for a future interval of time and the respective amounts of energy from the prosumers are generated in such a manner that, on the one hand, a relative position of the amount of energy within an interval for the particular prosumer, as defined by the minimum amount of energy and the maximum amount of energy, assumes an identical value for all prosumers and, on the other hand, a sum of the amounts of energy from all prosumers produces a value of zero. The invention can be used in the distribution of amounts of energy in a power supply system having conventional energy producers and energy consumers as well as in novel participants in the power supply system which can both consume and provide energy, for example an electric vehicle.

Description

description

The invention relates to methods and apparatus for allocating amounts of energy for prosumers in a power grid.

The progressive expansion of renewable energies is leading to an increasing decentralization of energy production. In addition, predicting an expected amount of energy to be generated due to potentially greater generation fluctuations, for renewable energy, for example, due to weather dependency, increasingly difficult. By introducing intelligent power grids, which in addition to the actual power network, a communication network for the exchange of information and to control decentralized units, this change can be taken into account. This makes it possible to regulate energy production and energy consumption by means of correspondingly intelligent producers and consumers connected to the communication network within certain limits. This is accompanied by increasing complexity in the balancing of energy production and energy consumption in the electricity grids. Mastering this complexity and balancing energy production and energy consumption are prerequisites for meeting the energy demands of consumers in the grid and ensuring grid stability. In addition to the classic energy producers and energy consumers, there are also novel subscribers in the power grid who can both store and deliver energy, such as electric cars. These classic energy producers, consumers and novel participants are called prosumers. At night, when there is usually a surplus of energy, the novice subscribers can pick up energy in their batteries and return it at peak times, for example in the morning between 6:00 and 9:00. Thus, it is the object of the present invention to provide methods and apparatus for allocating amounts of energy that allow on the one hand an adjustment of energy consumption and energy production in the power grid and on the other hand, the allocation of energy amounts per prosumer in a simple manner.

This object is solved by the independent claims. Further developments of the invention can be found in the dependent claims.

The invention relates to a method for allocating an amount of energy per prosumer, comprising the following steps:

Determining a maximum amount of energy and a minimum amount of energy for each prosumer;

Generating the j eweiligen amount of energy such that

a) a relative position of the amount of energy within a defined by the minimum amount of energy and the maximum amount of energy interval of the respective prosumers is made such that the relative positions of the prosumers take an identical value,

b) a sum of the amounts of energy gives a value of zero. In the present specification, the term prosumer

- a generator of energy that only supplies energy in a grid,

- an energy consumer who consumes only energy from a power grid, and

- a novel participant who can store and deliver energy,

Understood . The present invention is advantageous because it considers energy levels rather than power values. This allows an inherent mapping taking into account storage capacities in the prosumers. storage capacity In addition to controllable producers and consumers, they are responsible for ensuring that the minimum amount of energy to be supplied is actually lower than the maximum amount of energy available.

This means that when allocating energy, there is in fact a margin for every prosumer that can be exploited as part of the allocation of energy to the prosumers. The consideration of minimum and maximum energy levels per prosumer requires the definition of an energy quantity band for every prosumer. Within this range of energy bands, the amount of energy actually allocated to the respective prosumer must move. To ensure an adjustment of the amount of energy between consumption and generation, the sum of the amounts of energy across all prosumers after allocation must be zero. In this state, the power grid is balanced and there is neither over nor under supply of energy.

By generating the respective amount of energy such that a relative position of the amount of energy within an interval defined by the minimum amount of energy and the maximum amount of energy of the respective prosumers for all prosumers an identical value, it ensures that each prosumer compared to other Prosumern treated the same. This also ensures that each of the prosumers each receives an amount of energy that corresponds to either its maximum or minimum amount of energy. Thus, for short-term fluctuations in the power network capacities are available that can compensate for the prosumers by receiving or releasing energy. This conclusion, however, applies only to prosumers whose minimum and maximum amounts of energy are unequal.

In a first embodiment of the method, the following steps are carried out: Generating a maximum total amount of energy by summing the maximum amounts of energy;

Generating a minimum total amount of energy by summing the minimum amounts of energy;

Generating a first amount of energy by subtracting the maximum total amount of energy and the minimum total amount of energy;

Generating a respective second amount of energy per prosumer by subtraction of the respective maximum amount of energy and the respective minimum amount of energy;

Generating an energy factor per prosumer by multiplying the respective second amount of energy by the reciprocal of the first amount of energy;

Generating the respective amount of energy by adding the j e- minimal amount of energy and the product of an amount of the minimum total amount of energy and the respective energy factor.

These steps describe a first embodiment variant of the method taking into account intervals of the prosumer defined by the respective minimum and maximum amounts of energy. These steps are characterized by a simple and inexpensive feasibility. In a second alternative embodiment, the following steps are performed:

Generating a maximum total amount of energy by summing the maximum amounts of energy;

Generating an energy ratio by multiplying the maximum total energy amount by the reciprocal of the minimum total energy amount;

Generating an intermediate value per prosumer by subtracting a product from the energy ratio and the respective minimum amount of energy from the respective maximum amount of energy; Generating the respective amount of energy per prosumer by multiplying the respective intermediate value and the reciprocal from a subtraction of the energy ratio of a value one.

These steps describe a second alternative embodiment of the method. In this case, the respective quantities of energy are determined with the aid of the energy ratio, which is formed by multiplying the maximum total amount of energy by the reciprocal of the minimum total energy amount. This second alternative exemplary embodiment is also characterized by simple implementability and executability. In one development of the method, the allocation of the amounts of energy is in each case carried out for a future time interval. This ensures that changes in the behavior of the prosumer and thus optimization of the provision of energy can be accommodated. It also improves the stability of the overall network by responding to fluctuations in energy production and energy consumption.

In a development for this purpose, a length of the future time interval is set equidistantly, whereby a simple applicability of the method for future time intervals is ensured.

Alternatively, the length of the future time interval may be set such that in the event of an increase in a difference between maximum and minimum total energy amount of a current time interval and a difference between maximum and minimum total energy amount of a time interval earlier than the current time interval, the length of the future time interval is Length of the current time interval is dynamically adjusted, in particular shortened. This ensures that when a minimum and maximum total amount of energy, which indicates, for example, higher uncertainty in a prediction of the expected energy consumption, the future time interval for which the amounts of energy of the prosumer is to be determined changes, in particular shortened. This achieves an improved balancing of the allocation of the energy quantities and thus also an improved stability of the power network.

In an extension, the following steps are performed: a) allocating one cost function per prosumer, the respective cost function specifying costs for energy levels within the minimum amount of energy and the maximum energy yield of the particular prosumer;

b) selecting a first and second representative from the set of prosumers such that the cost function of the first representative has an absolute maximum slope and the cost function of the second representative a minimum absolute slope, wherein the maximum and the minimum slope each on a slope of the respective cost functions in the amount of energy associated with the agent;

c) generating new amounts of energy of the first and second representatives such that

a difference value of the respective amount of energy from the respective new quantity of energy of the first representative becomes identical to a difference value of the respective new amount of energy from the respective amount of energy of the second representative,

- the new amounts of energy of the first and second representatives are respectively selected within the minimum amount of energy and associated maximum amount of energy associated with the first and second representatives;

a sum of the respective costs of the new amounts of energy is less than a sum of the respective costs of the quantities of energy of the first and second representatives. By this extension, a cost reduction in the allocation of energy amounts of the prosumer considered is achieved. Here, the allocated amount of energy of a prosumer is reduced, which registers a high cost increase with an increase of an energy quantity. In order to balance the energy consumption with power generation in the power grid, that is, the sum of the amounts of energy across all prosumers is zero, the reduced amount of energy is provided to another prosumer, the increase in the amount of energy for the other prosumer causing a lower cost increase. Although there is a local shift in the amount of energy allocated, the amount of energy consumed versus the generation of energy remains balanced. In addition, a reduction of the costs in the entire power grid is made possible.

This extension can be supplemented by replacing the amounts of energy of the prosumers represented by the first and second representatives with the new amounts of energy (E1W, E2W) and repeating the steps of the previous extension. This ensures a cost optimization in the allocation of energy in a heuristic manner. Furthermore, the invention relates to a device for allocating an amount of energy per prosumer, comprising the following units: first unit for determining a maximum amount of energy and a minimum amount of energy for each prosumer;

Second unit for generating the respective amount of energy such that

a relative position of the amount of energy within an interval of the respective prosumer defined by the minimum amount of energy and the maximum amount of energy can be established in such a way that the relative positions of the prosumers assume an identical value,

a sum of the amounts of energy of the amounts of energy gives a value of zero. This allows the method to be implemented and executed according to the advantages described above. Furthermore, further units can implement and implement extensions of the invention.

The invention and its developments are explained in more detail with reference to drawings. Show it:

Figure 1 flowchart and structure of a device for

Performing the method in a first variant;

Figure 2 Overview of different amounts of energy for an embodiment;

FIG. 3 Flow chart and construction of a device for

Performing the method in a second variant; FIG. 4 shows cost functions for representing costs per respective energy quantity value;

Figure 5 flowchart and structure of a device for

Performing the method in a third variant;

Elements with the same function and mode of operation are provided with the same reference numerals in the figures. Figure 1 shows a flow chart for carrying out the method for allocating amounts of energy.

In a first step S1, for example, by a central unit of the prosumers P1, P5 their respective minimum amounts of energy ENI, EN5 and their maximum

Energy quantities EX1, ..., EX5 queried, see arrow PFL. In Figure 2, the respective minimum and maximum amounts of energy per prosumer can be seen in one example. In general, the maximum amount of energy defines that amount of energy that a prosumer can consume maximally or generate minimally in a time interval. Similarly, the minimum amount of energy defines the amount of energy that enters

Prosumer in a time interval can use minimal or maximum generate. In Figure 2 are negative energy levels for providing amounts of energy and positive energy levels for consumption of energy. In general, negative values can also be used for consumption together with positive values for generation.

In a second step S2, the respective amounts of energy E1,..., E5 are generated in such a way that, on the one hand, a relative position K1,..., R5 of the energy quantity within an interval of the j.sub.n defined by the minimum amount of energy and the maximum amount of energy Meanwhile Prosumers assumes an identical value for all prosumers and on the other hand gives a sum of the energy quantities a value 0. Special embodiments of the second step S2 are illustrated below with reference to two variants of execution.

After providing the respective amounts of energy, the state diagram is ended in the state END.

The method is explained in more detail below on the basis of a first exemplary embodiment. In particular, processing steps S21, S22, which are sub-steps of the second step S2 in FIG. 1, are discussed. FIG. 3 shows these processing steps.

Figure 2 shows first the minimum amounts of energy and maximum amounts of energy per prosumer. The amounts of energy are given in kilowatt hours (kWh), for example. For example, positive values correspond to energy consumption, negative values correspond to the provision of energy, that is to say energy generation. For example, the fifth prosumer P5 with i = 5 indicates EN5 = 10 as the minimum amount of energy and EX5 = 20 as the maximum amount of energy. The fifth prosumer is a pure energy consumer. The second prosumer P2 is a pure energy generator that can provide amounts of energy in the interval EN5 = -80 to EX5 = -70.

Attention is drawn in particular to the first prosumer PI, which specifies a minimum amount of energy EN1 = -10 and a maximum amount of energy EX5 = 10. This means that the first prosumer has both the ability to give energy and to consume energy. This prosumer is, for example, an electric car, which stores or can deliver energy via its battery.

The maximum total energy amount EXG is calculated by summing the respective maximum amounts of energy EXi

In the example according to FIG. 2, EXG = 80.

The minimum total amount of energy ENG is calculated by summing the minimum amounts of energy as

For the example according to FIG. 2, ENG = -20.

The formation of the minimum and maximum amounts of energy is performed by substep S21. Further steps of the first or second embodiment can be completed by the sub-step S22.

A first amount of energy ED1 is formed by differentiating the maximum total energy amount EXG and the minimum total energy amount ENG, that is, by ED1 = EXG-ENG = 100.

In the following, for each prosumer, a second amount of energy ED21, ED25 is obtained by subtraction of the respective maximum energy. len amount of energy EX1, ..., EX5 and the respective minimum amount of energy EN1, ..., EN5 generates, for example, ED21 = EX1-EN1. In Figure 2, the respective second amounts of energy for the calculation example are entered.

Furthermore, an energy factor EF1,... EF5 is formed for each prosumer by multiplying the respective second energy quantity ED2i by the reciprocal of the first energy quantities EDI. For example, for the third prosumer P3 this means

EF3 = ED23 / ED1 = 40/100 = 0.40. Another line in FIG. 2 represents the values for the respective energy factor.

In a further processing step, the respective amounts of energy E1,..., E5 are formed by adding the respective minimum amount of energy and the product of an amount of the minimum total energy amount and the respective energy factor. So the calculation formula is for this

Step:

The dissolution of the amount results from the fact that the minimum total amount of energy is always negative or zero, since otherwise no balance between energy consumption and energy production is possible.

The sum of the determined energy values E1 ,, ..., E5 is zero. Thus, supply and demand for energy are balanced. In an alternative second exemplary embodiment, the following sub-steps are run through, see FIG. 3:

Generating an energy ratio EV by multiplying the maximum total energy amount EXG by the reciprocal of the minimum amount of energy ENG, that is

In this example, EV = 80 / (-20) = -4. Generating intermediate values Z1, ..., Z5 per prosumer

Subtracting a product from the energy ratio EV and the respective minimum amount of energy from the respective maximum amount of energy per prosumer, that is

for example, for the second prosumer

Z2 = -70- {80 * (-80)) / (-20) = -70-640 / 20 = -390.

Furthermore, the respective amount of energy per prosumer is formed by multiplication from the respective intermediate value and the Keh value from subtraction of the energy ratio EV by a value of 1. That means ,

for example, for the second prosumer E2 = -390 / (1- (-4)) = - 78.

Finally, the quantities of energy E1,..., E5 generated can be reported back to the prosumers so that they have the quantities of energy to be consumed or to be provided in a coming time interval.

In a development of the method, a length of a future time interval TN can be set, see the third step S3 in FIG. 3. The length of the future time interval can be equidistant. Alternatively, in the event of an increase in a difference between maximum and minimum total energy of a current time interval TN versus a difference between maximum and minimum total energy levels of a time interval TN-1 earlier than the current time interval, the length of the future time interval may be dynamically adjusted, such as. be shortened.

The following diagram shows a minimum and maximum total energy amount ENG, EXG in kWh for the previous, current and future time intervals, the respective difference EXG-ENG and the length of the respective time interval in ms

(Milliseconds):

In this example, the difference increases so that the future time interval is shortened to 50 ms instead of the current 55 ms.

This adaptivity of the time interval ensures that the allocation of the respective amounts of energy of the prosumers can be adapted to current conditions in the power grid. Especially with a decrease of a difference between maximum and minimum total energy amount between two successive time intervals results in the conclusion of a more unstable power network with less flexibility in the individual Prosumern respect. their ability to give or receive energy. In this case, the use of a shorter future time interval can stabilize the power grid. With reference to Figure 4, an extension of the method using cost functions FC1, ..., FC5 is shown. This extension can also be seen in FIG. 5, which shows this extension in comparison to FIG. 3 in the fourth step S4. A cost function FCi, for example FC1 for the prosumer PI, indicates costs C, for example in euros, which arise when energy is supplied or consumed. Since the individual prosumer specify energy quantity bands with maximum and minimum energy quantities, the cost function can also be taken into account for determining the energy quantities for a future time interval.

4 shows in subfigure (A) a cost function for the prosumer P1, which decreases linearly from (-10; 100) to (0; 50) and then falling linearly from (0; 50) to (20; 45). In this description, the first number of the respective number pair EX, that is to say an energy quantity value, and the second number of the respective number pair C, that is to say the costs for a specific energy value, represent. The first Prosumer PI has the peculiarity that it can deliver and absorb both amounts of energy. However, the cost of delivering the amount of energy is very high, for example, when storing energy amounts more energy must be spent than can be given later. Thus, an increase in the cost C between the energy-value values -10 <EX <0 is greater in value than in the range of the energy-quantity values 0 <EX <20. According to the exemplary embodiment, see FIG. 2, the energy allocated to the first prosumer is El = -4 , This gives the cost C = 70.

Partial figure (B) of FIG. 4 shows a cost function for the second prosumer P2. The Prosumer P2 is a pure energy generator that delivers energy in the energy band from -80 to -70. Within this band its cost function FC2 is linearly decreasing and runs from (-80; 10) to {-70; 5). By applying the embodiment according to FIG. 2, so far the prosumer P2 has been assigned an energy quantity of E3 = -78. This corresponds to costs of C = 9.

From all prosumers the one is selected whose cost function in the corresponding amount of energy has the largest slope in terms of amount. This is the case for the first prosumer, so this is referred to hereafter as the first representative VI. In addition, from those prosumers one chooses one whose cost function has the smallest slope in the associated amount of energy. This is the case for the second prosumer, so that it will be referred to as second representative V2 in the following.

Next, new amounts of energy E1W and E2W are determined for the first and second agents V1, V2. For example, the new amount of energy ElW = -2 for the first ters VI and the new energy quantity E2W = -80 for the second representative V2. In determining the new amounts of energy, the following conditions must be fulfilled at the same time: a) A first difference value, formed by subtracting the amount of energy E1 from the new amount of energy E1W, in each case relative to the first representative, must result in a second difference value, formed by subtraction of the new amount of energy E2W of the amount of energy E2, in each case based on the second representative, be identical. In the example above

E1W-E1 = -2- (-4) = 2 and E2-E2W = -78- (-80) = 2.

b) The new energy quantities E1W, E2W must each lie within the energy bands, defined by the minimum and maximum energy quantities of the respective representatives. Within it also means that the new amounts of energy can also be the minimum or maximum amount of energy. For the new amounts of energy according to the present example, this is fulfilled.

E1W: -10 <= -2 <= 20

E2W: -80 <= -80 <= -70.

(the symbol "<=" means less than or equal to)

c) A sum of the respective costs of the new amounts of energy is less than a sum of the respective costs of the quantities of energy of the first and second representatives.

Sum of the costs of new energy amounts:

FC1 (-2) + FC2 (-80) = 60 + 10 = 70

Total cost of energy (previous cost): FC1 (-4) + FC2 (-78) = 70 + 8 = 78

Thus, this condition is fulfilled.

In an extension to this, the amounts of energy are replaced by the new amounts of energy of the respective prosumer. Further, the steps of selecting the representatives and calculating new amounts of energy for other prosumers are repeated iteratively until either an improvement remains below a predeterminable cost savings or until no two prosumers meeting the conditions are found. In FIG. 5 this extension is to be seen by a dashed arrow at the fourth step S4.

The presented method and the associated expansions can be carried out by a device DEV, wherein a first unit M1 comprises the first step S1, a second unit M2 the second step S2, a third unit M3, the third step S3, a fourth unit M4 fourth

Step S4 can implement and execute. The second unit M2 is moreover designed such that the specific method steps S21, S22 of both alternative embodiments can be implemented and executed. The units M1, ..., M4 can be realized in software, hardware or in combination of software and hardware. For example, a processor executes the steps S1 to S4 stored as program code in a memory attached to the processor. Furthermore, the processor has an input and output interface with which the minimum and maximum amounts of energy are queried by the prosumers and the determined energy quantities E1,..., E5 can be made available to the prosumers for a future time interval. Furthermore, intermediate results of the individual processing steps, such as, for example, the minimum and maximum total energy quantities or the cost functions FC1,..., FC5, can additionally be stored in the memory. Furthermore, the units M1 to M4 can also be realized by a fixed wiring of electronic components to a memory module.

The extensions can be combined arbitrarily within the scope of the methods or the devices.

Claims

claims

1. Method for allocating an amount of energy (El, ..., E5) per prosumer (P1, ... P5), comprising the following steps:

Determining a maximum amount of energy (EX1, EX5) and a minimum amount of energy (ENI, ..., EN5) for each prosumer (P1, ..., P5);

Generating the respective amount of energy (E1, ..., E5) such that

a) a relative position (Rl, R5) of the amount of energy (E1,

..., E5) within an interval defined by the minimum energy bands (ENI, ..., EN5) and the maximum amount of energy (EX1, ..., EX5) of the respective prosumer (P1, ..., P5) is produced such that the relative positions (R1, R5) of the prosumer (P1,

P5) have an identical value,

b) a sum of the amounts of energy (E1, ..., E5) gives a value of zero.

2. The method according to claim 1,

with the following steps:

Generating a maximum total amount of energy (EXG) by summing the maximum amounts of energy (EX1, EX5);

Generating a minimum total amount of energy (ENG) by summing the minimum amounts of energy (EN1, ..., EN5);

Generating a first amount of energy (ED1) by subtracting the maximum total energy amount (EXG) and the minimum total energy amount (ENG);

Generating a respective second amount of energy (ED21,

ED25) per prosumer (P1, ..., P5) by subtraction of the respective maximum amount of energy (EX1, ..., EX5) and the respective minimum amount of energy (ENI, ..., EN5);

Generating an energy factor (EF1, EF5) per prosumer

(PI, ..., P5) by multiplying the respective second amount of energy (ED21, ED25) by the reciprocal of the first

Amount of energy (ED1);

Generating the respective amount of energy (E1,..., E5) by adding the respective minimum amount of energy (EN1,..., EN5) and the product of an amount of the minimum total energy amount (ENG) and the respective energy factor (EF1, EF5).

3. The method according to claim 1,

with the following steps:

Generating a maximum total amount of energy (EXG) by summing the maximum amounts of energy (EX1, ..., EX5);

Generating an energy ratio (EV) by multiplying the maximum total energy amount (EXG) by the reciprocal of the total minimum energy amount (ENG);

Generating an intermediate value (Z1,..., Z5) per prosumer (PI,..., P5) by subtracting a product from the energy ratio (EV) and the respective minimum amount of energy (EN1,..., EN5) from the respective maximum amount of energy (EX1, EX5);

Generating the respective amount of energy (El, ..., E5) per prosumer (P1, P5) by multiplying the respective intermediate value (Z1, Z5) and the reciprocal from a subtraction of the energy ratio (EV) from a value one.

4. The method according to any one of the preceding claims, wherein the allocation of the amounts of energy (E1 ,, ..., E5) in each case for a future time interval (TN) is performed.

5. The method of claim 4, wherein

a length of the future time interval (TN) is set equidistant.

6. The method of claim 4, wherein

setting a length of the future time interval (TN1) such that, in the case of an increase in a difference between maximum and minimum total energy quantities (EXG, ENG) of a current time interval (TN) and a difference between maximum and minimum total energy quantities (EXG, ENG), one current time interval (TN) earlier time interval (TN-1) the length of the future time interval (TN1) compared to the length of the current time interval (TN) dynamically adjusted, in particular shortened, is.

7. Method according to one of the preceding claims, in which the following further steps are carried out:

a) assigning a cost function (FC1, FC5) to each prosumer (PI, P5), the respective cost function (FC1,

FC5) costs (C) for energy quantities (EX) within the minimum amount of energy (EN1, ..., EN5) and the maximum amount of energy (EX1, ..., EX5) of the respective prosumer (P1,

P5) indicates;

b) selecting a first and second representative (V1, V2) from the set of prosumers (PI, ..., P5) such that the cost function (FC1) of the first representative (V1) has a maximum slope and the cost function (FC2 ) of the second representative (V2) have an absolute minimum slope, wherein the maximum and the minimum slope are each based on a slope of the respective cost functions (FC1, FC5) in the energy quantity (E1, V2) associated with the representative (V1, V2). ..., E5);

c) generating new amounts of energy (E1W, E2W) of the first and second representatives (V1, V2) such that

- A difference value of the respective amount of energy (El) of the respective new amount of energy (E1W) of the first representative (V1) identical to a difference value of the respective new

Amount of energy (E2W) of the respective amount of energy (E2) of the second representative (V2),

the new amounts of energy (E1W, E2W) of the first and second representatives (V1, V2) respectively within the minimum amount of energy (ED1, ED2) associated with the first and second representatives (V1, V2) and associated maximum amount of energy (EX1, EX2) is elected;

a sum of the respective costs of the new amounts of energy (E1W, E2W) is less than a sum of the respective costs of the quantities of energy (E1, E2) of the first and second representatives (V1, V2).

8. The method of claim 7, wherein the quantities of energy (E1, E2) of the prosumer (P1, P2) represented by the first and second representatives (V1, V2) are replaced by the new amounts of energy (E1W, E2W);

the steps of claim 6 are repeated.

9. Device (DEV) for allocating an amount of energy (El, ..., E5) per prosumer (P1, ... P5), comprising the following units: First unit (Ml) for determining a maximum amount of energy {EX1, ... , EX5) and a minimum amount of energy (EN1,

EN5) for each prosumer (P1, P5);

Second unit (M2) for generating the respective amount of energy (E1, ..., E5) such that

c) a relative position (R1, R5) of the amount of energy (E1,

..., E5) can be produced within a range of the respective prosumer (P1, P5) defined by the minimum energy quantity (EN1,..., EN5) and the maximum amount of energy (EX1,..., EX5) is that the relative positions (R1, R5) of the prosumer (P1, P5) have an identical value,

d) a sum of the amounts of energy (E1, ..., E5) gives a value of zero.